I recently attended the International Interscience Conference of Infectious Diseases and Vaccines, and I would like to share some of the presentations from the session entitled “Hot Topics in Vaccines.”

CNS complications of varicella-zoster virus infection

Dr. Michelle Science of the Hospital for Sick Children, Toronto, and her associates described the spectrum of CNS complications of varicella-zoster virus (VZV) in children admitted to the hospital during 1999-2012 (J. Pediatr. 2014;165:779-85). Clinical syndromes included 26 cases of acute cerebellar ataxia, 17 of encephalitis, 16 isolated seizures, 10 strokes, 10 cases of meningitis, 2 cases of Guillain-Barré syndrome, 2 cases of acute disseminated encephalomyelitis, and 1 case of Ramsay Hunt syndrome. In children with acute nonstroke complications, neurologic symptoms occurred a median 5 days after the onset of rash, but neurologic symptoms predated the onset of rash in five cases and in two cases there were no exanthems. Time between rash onset and stroke ranged from 2 to 26 weeks (median 16 weeks). There were three deaths among the 17 (18%) children with encephalitis. Among the 39 children with follow-up at 1 year, residual neurologic sequelae occurred in 9 (23%). Only four of the children had received a VZV vaccine. Although an effective vaccine exists, neurologic complications of VZV infection continue to occur.

Timely versus delayed early childhood vaccination and seizures

Dr. Simon J. Hambidge of Denver Health, Colorado, and his associates studied a cohort of 323,247 U.S. children from the Vaccine Safety Datalink born during 2004-2008 for an association between the timing of childhood vaccination and the first occurrence of seizures (Pediatrics 2014;133(6):e1492-9). In the first year, there was no association between the timing of infant vaccination and postvaccination seizures. In the second year, the incidence rate ratio for seizures after receiving the first MMR dose at 12-15 months was 2.7, compared with a rate of 6.5 after an MMR dose at 16-23 months; thus there were more seizures when MMR was delayed. The incidence rate ratio for seizures after receiving the first measles-mumps-rubella-varicella vaccine (MMRV) dose at 12-15 months was 4.95, compared with 9.80 after an MMRV dose at 16-23 months. Again, there were more seizures when MMRV was delayed. These findings suggest that on-time vaccination is as safe with regard to seizures as delayed vaccination in year 1, and that delayed vaccination in year 2 is linked to more postvaccination seizures than on-time vaccination with MMR and that risk is doubled with MMRV.

Effective messages in vaccine promotion: a randomized trial

Brendan Nyhan, Ph.D., of Dartmouth College, Hanover, N.H., and his associates tested the efficacy of various informational messages tailored to reduce misperceptions about vaccines and increase MMR vaccination rates (Pediatrics 2014;133:e835-42). Nearly 1,800 parents were randomly assigned to receive one of four interventions: information explaining the lack of evidence that MMR causes autism from the Centers for Disease Control and Prevention; information about the danger of the diseases prevented by MMR from the Vaccine Information Statement; photos of children with diseases prevented by the MMR vaccine; a dramatic narrative about an infant who almost died of measles from a CDC fact sheet. In addition there was a control group. None of the four interventions increased parents’ intention to vaccinate another child if they had one in the future. Although refuting claims of an MMR/autism link did reduce misperceptions that vaccines cause autism, it decreased intent to vaccinate among parents who had the least favorable attitudes toward vaccines. Also, photos of sick children increased belief in an association between vaccines and autism, and the dramatic narrative about an infant in danger increased belief in serious vaccine side effects. Attempts to rectify misperceptions about vaccines may be counterproductive in some populations, so public health communications about vaccines should be tested before being widely disseminated.

Silent reintroduction of wild-type poliovirus to Israel, 2013

Dr. E. Kaliner of the Israeli Ministry of Health, Jerusalem, and associates, reported that Israel has been certified as polio-free by the World Health Organization for decades and its routine immunization schedule, like the United States, consists of inactivated poliovirus vaccine only (Euro. Surveill. 2014;19:20703). At the end of May 2013, the Israeli Ministry of Health confirmed the reintroduction of wild-type poliovirus 1 into the country. Documented ongoing human-to-human transmission required a thorough risk assessment followed by a supplemental immunization campaign using oral polio vaccine.

Trends in otitis media–related health care use in the United States, 2001-2011

Dr. Tal Marom of the University of Texas, Galveston, and associates studied the trend in otitis media–related health care use in the United States during the pneumococcal conjugate vaccine (PCV) era in 2001-2011 (JAMA Pediatr. 2014;168:68-75). An analysis of an insurance claims database of a large, nationwide managed health care plan was conducted; 7.82 million children aged 6 years and under had 6.21 million primary otitis media (OM) visits. There was an overall downward trend in OM-related health care use across the 10-year study. Recurrent OM rates (defined as greater than or equal to three OM visits within 6 months) decreased at 0.003 per child-year in 2001-2009 and at 0.018 per child-year in 2010-2011. Prior to the pneumococcal conjugate vaccine (PCV-13), there was a stable rate ratio of 1.38 between OM visit rates. During the transition year 2010, the RR decreased significantly to 1.32, and in 2011 the RR decreased further to 1.01. Mastoiditis rates significantly decreased from 61 per 100,000 child-years in 2008 to 37 per 100,000 child-years in 2011. The ventilating tube insertion rate decreased by 19% from 2010 to 2011. Tympanic membrane perforation/otorrhea rates increased gradually and significantly from 3,721 per 100,000 OM child-years in 2001 to 4,542 per 100,000 OM child-years in 2011; the reasons for this are unclear.

Dr. Pichichero, a specialist in pediatric infectious diseases, is director of the Research Institute, Rochester (N.Y.) General Hospital. He is also a pediatrician at Legacy Pediatrics in Rochester. Dr. Pichichero said he had no financial disclosures relevant to this article. To comment, e-mail him at [email protected].

I recently attended the International Interscience Conference of Infectious Diseases and Vaccines, and I would like to share some of the presentations from the session entitled “Hot Topics in Vaccines.”

CNS complications of varicella-zoster virus infection

Dr. Michelle Science of the Hospital for Sick Children, Toronto, and her associates described the spectrum of CNS complications of varicella-zoster virus (VZV) in children admitted to the hospital during 1999-2012 (J. Pediatr. 2014;165:779-85). Clinical syndromes included 26 cases of acute cerebellar ataxia, 17 of encephalitis, 16 isolated seizures, 10 strokes, 10 cases of meningitis, 2 cases of Guillain-Barré syndrome, 2 cases of acute disseminated encephalomyelitis, and 1 case of Ramsay Hunt syndrome. In children with acute nonstroke complications, neurologic symptoms occurred a median 5 days after the onset of rash, but neurologic symptoms predated the onset of rash in five cases and in two cases there were no exanthems. Time between rash onset and stroke ranged from 2 to 26 weeks (median 16 weeks). There were three deaths among the 17 (18%) children with encephalitis. Among the 39 children with follow-up at 1 year, residual neurologic sequelae occurred in 9 (23%). Only four of the children had received a VZV vaccine. Although an effective vaccine exists, neurologic complications of VZV infection continue to occur.

Timely versus delayed early childhood vaccination and seizures

Dr. Simon J. Hambidge of Denver Health, Colorado, and his associates studied a cohort of 323,247 U.S. children from the Vaccine Safety Datalink born during 2004-2008 for an association between the timing of childhood vaccination and the first occurrence of seizures (Pediatrics 2014;133(6):e1492-9). In the first year, there was no association between the timing of infant vaccination and postvaccination seizures. In the second year, the incidence rate ratio for seizures after receiving the first MMR dose at 12-15 months was 2.7, compared with a rate of 6.5 after an MMR dose at 16-23 months; thus there were more seizures when MMR was delayed. The incidence rate ratio for seizures after receiving the first measles-mumps-rubella-varicella vaccine (MMRV) dose at 12-15 months was 4.95, compared with 9.80 after an MMRV dose at 16-23 months. Again, there were more seizures when MMRV was delayed. These findings suggest that on-time vaccination is as safe with regard to seizures as delayed vaccination in year 1, and that delayed vaccination in year 2 is linked to more postvaccination seizures than on-time vaccination with MMR and that risk is doubled with MMRV.

Effective messages in vaccine promotion: a randomized trial

Brendan Nyhan, Ph.D., of Dartmouth College, Hanover, N.H., and his associates tested the efficacy of various informational messages tailored to reduce misperceptions about vaccines and increase MMR vaccination rates (Pediatrics 2014;133:e835-42). Nearly 1,800 parents were randomly assigned to receive one of four interventions: information explaining the lack of evidence that MMR causes autism from the Centers for Disease Control and Prevention; information about the danger of the diseases prevented by MMR from the Vaccine Information Statement; photos of children with diseases prevented by the MMR vaccine; a dramatic narrative about an infant who almost died of measles from a CDC fact sheet. In addition there was a control group. None of the four interventions increased parents’ intention to vaccinate another child if they had one in the future. Although refuting claims of an MMR/autism link did reduce misperceptions that vaccines cause autism, it decreased intent to vaccinate among parents who had the least favorable attitudes toward vaccines. Also, photos of sick children increased belief in an association between vaccines and autism, and the dramatic narrative about an infant in danger increased belief in serious vaccine side effects. Attempts to rectify misperceptions about vaccines may be counterproductive in some populations, so public health communications about vaccines should be tested before being widely disseminated.

Silent reintroduction of wild-type poliovirus to Israel, 2013

Dr. E. Kaliner of the Israeli Ministry of Health, Jerusalem, and associates, reported that Israel has been certified as polio-free by the World Health Organization for decades and its routine immunization schedule, like the United States, consists of inactivated poliovirus vaccine only (Euro. Surveill. 2014;19:20703). At the end of May 2013, the Israeli Ministry of Health confirmed the reintroduction of wild-type poliovirus 1 into the country. Documented ongoing human-to-human transmission required a thorough risk assessment followed by a supplemental immunization campaign using oral polio vaccine.

Trends in otitis media–related health care use in the United States, 2001-2011

Dr. Tal Marom of the University of Texas, Galveston, and associates studied the trend in otitis media–related health care use in the United States during the pneumococcal conjugate vaccine (PCV) era in 2001-2011 (JAMA Pediatr. 2014;168:68-75). An analysis of an insurance claims database of a large, nationwide managed health care plan was conducted; 7.82 million children aged 6 years and under had 6.21 million primary otitis media (OM) visits. There was an overall downward trend in OM-related health care use across the 10-year study. Recurrent OM rates (defined as greater than or equal to three OM visits within 6 months) decreased at 0.003 per child-year in 2001-2009 and at 0.018 per child-year in 2010-2011. Prior to the pneumococcal conjugate vaccine (PCV-13), there was a stable rate ratio of 1.38 between OM visit rates. During the transition year 2010, the RR decreased significantly to 1.32, and in 2011 the RR decreased further to 1.01. Mastoiditis rates significantly decreased from 61 per 100,000 child-years in 2008 to 37 per 100,000 child-years in 2011. The ventilating tube insertion rate decreased by 19% from 2010 to 2011. Tympanic membrane perforation/otorrhea rates increased gradually and significantly from 3,721 per 100,000 OM child-years in 2001 to 4,542 per 100,000 OM child-years in 2011; the reasons for this are unclear.

Dr. Pichichero, a specialist in pediatric infectious diseases, is director of the Research Institute, Rochester (N.Y.) General Hospital. He is also a pediatrician at Legacy Pediatrics in Rochester. Dr. Pichichero said he had no financial disclosures relevant to this article. To comment, e-mail him at [email protected].

I recently attended the International Interscience Conference of Infectious Diseases and Vaccines, and I would like to share some of the presentations from the session entitled “Hot Topics in Vaccines.”

CNS complications of varicella-zoster virus infection

Dr. Michelle Science of the Hospital for Sick Children, Toronto, and her associates described the spectrum of CNS complications of varicella-zoster virus (VZV) in children admitted to the hospital during 1999-2012 (J. Pediatr. 2014;165:779-85). Clinical syndromes included 26 cases of acute cerebellar ataxia, 17 of encephalitis, 16 isolated seizures, 10 strokes, 10 cases of meningitis, 2 cases of Guillain-Barré syndrome, 2 cases of acute disseminated encephalomyelitis, and 1 case of Ramsay Hunt syndrome. In children with acute nonstroke complications, neurologic symptoms occurred a median 5 days after the onset of rash, but neurologic symptoms predated the onset of rash in five cases and in two cases there were no exanthems. Time between rash onset and stroke ranged from 2 to 26 weeks (median 16 weeks). There were three deaths among the 17 (18%) children with encephalitis. Among the 39 children with follow-up at 1 year, residual neurologic sequelae occurred in 9 (23%). Only four of the children had received a VZV vaccine. Although an effective vaccine exists, neurologic complications of VZV infection continue to occur.

Timely versus delayed early childhood vaccination and seizures

Dr. Simon J. Hambidge of Denver Health, Colorado, and his associates studied a cohort of 323,247 U.S. children from the Vaccine Safety Datalink born during 2004-2008 for an association between the timing of childhood vaccination and the first occurrence of seizures (Pediatrics 2014;133(6):e1492-9). In the first year, there was no association between the timing of infant vaccination and postvaccination seizures. In the second year, the incidence rate ratio for seizures after receiving the first MMR dose at 12-15 months was 2.7, compared with a rate of 6.5 after an MMR dose at 16-23 months; thus there were more seizures when MMR was delayed. The incidence rate ratio for seizures after receiving the first measles-mumps-rubella-varicella vaccine (MMRV) dose at 12-15 months was 4.95, compared with 9.80 after an MMRV dose at 16-23 months. Again, there were more seizures when MMRV was delayed. These findings suggest that on-time vaccination is as safe with regard to seizures as delayed vaccination in year 1, and that delayed vaccination in year 2 is linked to more postvaccination seizures than on-time vaccination with MMR and that risk is doubled with MMRV.

Effective messages in vaccine promotion: a randomized trial

Brendan Nyhan, Ph.D., of Dartmouth College, Hanover, N.H., and his associates tested the efficacy of various informational messages tailored to reduce misperceptions about vaccines and increase MMR vaccination rates (Pediatrics 2014;133:e835-42). Nearly 1,800 parents were randomly assigned to receive one of four interventions: information explaining the lack of evidence that MMR causes autism from the Centers for Disease Control and Prevention; information about the danger of the diseases prevented by MMR from the Vaccine Information Statement; photos of children with diseases prevented by the MMR vaccine; a dramatic narrative about an infant who almost died of measles from a CDC fact sheet. In addition there was a control group. None of the four interventions increased parents’ intention to vaccinate another child if they had one in the future. Although refuting claims of an MMR/autism link did reduce misperceptions that vaccines cause autism, it decreased intent to vaccinate among parents who had the least favorable attitudes toward vaccines. Also, photos of sick children increased belief in an association between vaccines and autism, and the dramatic narrative about an infant in danger increased belief in serious vaccine side effects. Attempts to rectify misperceptions about vaccines may be counterproductive in some populations, so public health communications about vaccines should be tested before being widely disseminated.

Silent reintroduction of wild-type poliovirus to Israel, 2013

Dr. E. Kaliner of the Israeli Ministry of Health, Jerusalem, and associates, reported that Israel has been certified as polio-free by the World Health Organization for decades and its routine immunization schedule, like the United States, consists of inactivated poliovirus vaccine only (Euro. Surveill. 2014;19:20703). At the end of May 2013, the Israeli Ministry of Health confirmed the reintroduction of wild-type poliovirus 1 into the country. Documented ongoing human-to-human transmission required a thorough risk assessment followed by a supplemental immunization campaign using oral polio vaccine.

Trends in otitis media–related health care use in the United States, 2001-2011

Dr. Tal Marom of the University of Texas, Galveston, and associates studied the trend in otitis media–related health care use in the United States during the pneumococcal conjugate vaccine (PCV) era in 2001-2011 (JAMA Pediatr. 2014;168:68-75). An analysis of an insurance claims database of a large, nationwide managed health care plan was conducted; 7.82 million children aged 6 years and under had 6.21 million primary otitis media (OM) visits. There was an overall downward trend in OM-related health care use across the 10-year study. Recurrent OM rates (defined as greater than or equal to three OM visits within 6 months) decreased at 0.003 per child-year in 2001-2009 and at 0.018 per child-year in 2010-2011. Prior to the pneumococcal conjugate vaccine (PCV-13), there was a stable rate ratio of 1.38 between OM visit rates. During the transition year 2010, the RR decreased significantly to 1.32, and in 2011 the RR decreased further to 1.01. Mastoiditis rates significantly decreased from 61 per 100,000 child-years in 2008 to 37 per 100,000 child-years in 2011. The ventilating tube insertion rate decreased by 19% from 2010 to 2011. Tympanic membrane perforation/otorrhea rates increased gradually and significantly from 3,721 per 100,000 OM child-years in 2001 to 4,542 per 100,000 OM child-years in 2011; the reasons for this are unclear.

Dr. Pichichero, a specialist in pediatric infectious diseases, is director of the Research Institute, Rochester (N.Y.) General Hospital. He is also a pediatrician at Legacy Pediatrics in Rochester. Dr. Pichichero said he had no financial disclosures relevant to this article. To comment, e-mail him at [email protected].

To the Editor: In their article about the care of patients with advanced chronic kidney disease, Sakhuja et al¹ mentioned that metformin is contraindicated in chronic kidney disease.

Metformin is a good and useful drug. Not only is it one of the cheapest antidiabetic medications, it is the only one shown to reduce cardiovascular mortality rates in type 2 diabetes mellitus.

Although metformin is thought to increase the risk of lactic acidosis, a Cochrane review² found that the incidence of lactic acidosis was only 4.3 cases per 100,000 patient-years in patients taking metformin, compared with 5.4 cases per 100,000 patient-years in patients not taking metformin. Furthermore, in a large registry of patients with type 2 diabetes and atherothrombosis,³ the rate of all-cause mortality was 24% lower in metformin users than in nonusers, and in those who had moderate renal impairment (creatinine clearance 30–59 mL/min/1.73 m²) the difference was 36%.³

A trial by Rachmani et al⁴ raised questions about the standard contraindications to metformin. The authors reviewed 393 patients who had at least one contraindication to metformin but who were receiving it anyway. Their serum creatinine levels ranged from 1.5 to 2.5 mg/dL. There were no cases of lactic acidosis reported. The patients were then randomized either to continue taking metformin or to stop taking it. At 2 years, the group that had stopped taking it had gained more weight, and their glycemic control was worse.

In the Cochrane analysis,² although individual creatinine levels were not available, 53% of the studies reviewed did not exclude patients with serum creatinine levels higher than 1.5 mg/dL. This equated to 37,360 patient-years of metformin use in studies that included patients with chronic kidney disease, and did not lead to lactic acidosis.

Even though metformin’s US package insert says that it is contraindicated if the serum creatinine level is 1.5 mg/dL or higher in men or 1.4 mg/dL or higher in women or if the creatinine clearance is “abnormal,” in view of the available evidence, many countries (eg, the United Kingdom, Australia, the Netherlands) now allow metformin to be used in patients with glomerular filtration rates as low as 30 mL/min/1.73m², with lower doses if the glomerular filtration rate is lower than 45.⁵

The current contraindication to metformin in chronic kidney disease needs to be reviewed. In poor countries like India, this cheap medicine may be the only option available for treating type 2 diabetes mellitus, and it remains the first-line therapy for type 2 diabetes mellitus as recommended by the International Diabetes Federation, the American Diabetes Association, and the European Association for the Study of Diabetes.⁵

To the Editor: In their article about the care of patients with advanced chronic kidney disease, Sakhuja et al¹ mentioned that metformin is contraindicated in chronic kidney disease.

Metformin is a good and useful drug. Not only is it one of the cheapest antidiabetic medications, it is the only one shown to reduce cardiovascular mortality rates in type 2 diabetes mellitus.

Although metformin is thought to increase the risk of lactic acidosis, a Cochrane review² found that the incidence of lactic acidosis was only 4.3 cases per 100,000 patient-years in patients taking metformin, compared with 5.4 cases per 100,000 patient-years in patients not taking metformin. Furthermore, in a large registry of patients with type 2 diabetes and atherothrombosis,³ the rate of all-cause mortality was 24% lower in metformin users than in nonusers, and in those who had moderate renal impairment (creatinine clearance 30–59 mL/min/1.73 m²) the difference was 36%.³

A trial by Rachmani et al⁴ raised questions about the standard contraindications to metformin. The authors reviewed 393 patients who had at least one contraindication to metformin but who were receiving it anyway. Their serum creatinine levels ranged from 1.5 to 2.5 mg/dL. There were no cases of lactic acidosis reported. The patients were then randomized either to continue taking metformin or to stop taking it. At 2 years, the group that had stopped taking it had gained more weight, and their glycemic control was worse.

In the Cochrane analysis,² although individual creatinine levels were not available, 53% of the studies reviewed did not exclude patients with serum creatinine levels higher than 1.5 mg/dL. This equated to 37,360 patient-years of metformin use in studies that included patients with chronic kidney disease, and did not lead to lactic acidosis.

Even though metformin’s US package insert says that it is contraindicated if the serum creatinine level is 1.5 mg/dL or higher in men or 1.4 mg/dL or higher in women or if the creatinine clearance is “abnormal,” in view of the available evidence, many countries (eg, the United Kingdom, Australia, the Netherlands) now allow metformin to be used in patients with glomerular filtration rates as low as 30 mL/min/1.73m², with lower doses if the glomerular filtration rate is lower than 45.⁵

The current contraindication to metformin in chronic kidney disease needs to be reviewed. In poor countries like India, this cheap medicine may be the only option available for treating type 2 diabetes mellitus, and it remains the first-line therapy for type 2 diabetes mellitus as recommended by the International Diabetes Federation, the American Diabetes Association, and the European Association for the Study of Diabetes.⁵

To the Editor: In their article about the care of patients with advanced chronic kidney disease, Sakhuja et al¹ mentioned that metformin is contraindicated in chronic kidney disease.

Metformin is a good and useful drug. Not only is it one of the cheapest antidiabetic medications, it is the only one shown to reduce cardiovascular mortality rates in type 2 diabetes mellitus.

Although metformin is thought to increase the risk of lactic acidosis, a Cochrane review² found that the incidence of lactic acidosis was only 4.3 cases per 100,000 patient-years in patients taking metformin, compared with 5.4 cases per 100,000 patient-years in patients not taking metformin. Furthermore, in a large registry of patients with type 2 diabetes and atherothrombosis,³ the rate of all-cause mortality was 24% lower in metformin users than in nonusers, and in those who had moderate renal impairment (creatinine clearance 30–59 mL/min/1.73 m²) the difference was 36%.³

A trial by Rachmani et al⁴ raised questions about the standard contraindications to metformin. The authors reviewed 393 patients who had at least one contraindication to metformin but who were receiving it anyway. Their serum creatinine levels ranged from 1.5 to 2.5 mg/dL. There were no cases of lactic acidosis reported. The patients were then randomized either to continue taking metformin or to stop taking it. At 2 years, the group that had stopped taking it had gained more weight, and their glycemic control was worse.

In the Cochrane analysis,² although individual creatinine levels were not available, 53% of the studies reviewed did not exclude patients with serum creatinine levels higher than 1.5 mg/dL. This equated to 37,360 patient-years of metformin use in studies that included patients with chronic kidney disease, and did not lead to lactic acidosis.

Even though metformin’s US package insert says that it is contraindicated if the serum creatinine level is 1.5 mg/dL or higher in men or 1.4 mg/dL or higher in women or if the creatinine clearance is “abnormal,” in view of the available evidence, many countries (eg, the United Kingdom, Australia, the Netherlands) now allow metformin to be used in patients with glomerular filtration rates as low as 30 mL/min/1.73m², with lower doses if the glomerular filtration rate is lower than 45.⁵

The current contraindication to metformin in chronic kidney disease needs to be reviewed. In poor countries like India, this cheap medicine may be the only option available for treating type 2 diabetes mellitus, and it remains the first-line therapy for type 2 diabetes mellitus as recommended by the International Diabetes Federation, the American Diabetes Association, and the European Association for the Study of Diabetes.⁵

In Reply: We appreciate Dr. Imam’s comments regarding using metformin in those with chronic kidney disease.

The US Food and Drug Administration currently lists metformin as contraindicated in those with mild to moderate renal insufficiency, with serum creatinine levels greater than or equal to 1.5 mg/dL in males and greater than or equal to 1.4 mg/dL in females. This contraindication is based on the pharmacokinetics of the medication and, likely, the association of a similar medication, phenformin, with lactic acidosis, which eventually led to its withdrawal from the market. However, lactic acidosis is much less frequent with metformin than with phenformin.¹

We agree that metformin is an invaluable medication for diabetes mellitus not requiring insulin. We also agree that lactic acidosis is rare, especially in those with mild renal insufficiency. However, lactic acidosis does occur in patients with chronic kidney disease while on metformin and, however rare, when it does occur it is a life-threatening event.²

The clearance of metformin is strongly dependent on kidney function,³ and therefore guidelines still recommend reducing the dose in those with moderate renal insufficiency and recommend considering stopping the medication in those with severe renal insufficiency—the population we were talking about in our article.⁴ We are aware of changes to the guidelines that have been made by various groups, and in many circumstances we ourselves take an individualized approach, weighing the risks and benefits of continued therapy with the patient and his or her primary care provider. That being said, we did not believe that such nuanced recommendations were appropriate for our article, especially since they are contrary to marketing restrictions for the drug.

In Reply: We appreciate Dr. Imam’s comments regarding using metformin in those with chronic kidney disease.

The US Food and Drug Administration currently lists metformin as contraindicated in those with mild to moderate renal insufficiency, with serum creatinine levels greater than or equal to 1.5 mg/dL in males and greater than or equal to 1.4 mg/dL in females. This contraindication is based on the pharmacokinetics of the medication and, likely, the association of a similar medication, phenformin, with lactic acidosis, which eventually led to its withdrawal from the market. However, lactic acidosis is much less frequent with metformin than with phenformin.¹

We agree that metformin is an invaluable medication for diabetes mellitus not requiring insulin. We also agree that lactic acidosis is rare, especially in those with mild renal insufficiency. However, lactic acidosis does occur in patients with chronic kidney disease while on metformin and, however rare, when it does occur it is a life-threatening event.²

The clearance of metformin is strongly dependent on kidney function,³ and therefore guidelines still recommend reducing the dose in those with moderate renal insufficiency and recommend considering stopping the medication in those with severe renal insufficiency—the population we were talking about in our article.⁴ We are aware of changes to the guidelines that have been made by various groups, and in many circumstances we ourselves take an individualized approach, weighing the risks and benefits of continued therapy with the patient and his or her primary care provider. That being said, we did not believe that such nuanced recommendations were appropriate for our article, especially since they are contrary to marketing restrictions for the drug.

In Reply: We appreciate Dr. Imam’s comments regarding using metformin in those with chronic kidney disease.

The US Food and Drug Administration currently lists metformin as contraindicated in those with mild to moderate renal insufficiency, with serum creatinine levels greater than or equal to 1.5 mg/dL in males and greater than or equal to 1.4 mg/dL in females. This contraindication is based on the pharmacokinetics of the medication and, likely, the association of a similar medication, phenformin, with lactic acidosis, which eventually led to its withdrawal from the market. However, lactic acidosis is much less frequent with metformin than with phenformin.¹

We agree that metformin is an invaluable medication for diabetes mellitus not requiring insulin. We also agree that lactic acidosis is rare, especially in those with mild renal insufficiency. However, lactic acidosis does occur in patients with chronic kidney disease while on metformin and, however rare, when it does occur it is a life-threatening event.²

The clearance of metformin is strongly dependent on kidney function,³ and therefore guidelines still recommend reducing the dose in those with moderate renal insufficiency and recommend considering stopping the medication in those with severe renal insufficiency—the population we were talking about in our article.⁴ We are aware of changes to the guidelines that have been made by various groups, and in many circumstances we ourselves take an individualized approach, weighing the risks and benefits of continued therapy with the patient and his or her primary care provider. That being said, we did not believe that such nuanced recommendations were appropriate for our article, especially since they are contrary to marketing restrictions for the drug.

 

 

Drugs in vials

Credit: Bill Branson

 

New research suggests maintenance therapy may not be necessary for patients with follicular lymphoma (FL) who have a low tumor burden.

Investigators compared rituximab re-treatment with rituximab maintenance in nearly 300 FL patients, and results showed no significant difference between the treatment groups in the time to disease recurrence.

The researchers also noted that the re-treatment strategy was more cost-effective.

“For those 2 reasons, we recommend a retreatment strategy over a maintenance strategy in this patient population,” said Brad S. Kahl, MD, of the University of Wisconsin in Madison.

Dr Kahl and his colleagues described this research—the RESORT trial—in the Journal of Clinical Oncology. Early results from this trial were previously presented at the 2011 ASH Annual Meeting.

The team evaluated 289 patients with previously untreated, low-tumor-burden FL. All patients responded to initial treatment with rituximab (4 doses).

Patients were then randomized to receive maintenance therapy—a single dose of rituximab every 3 months until treatment failure—or rituximab re-treatment upon disease recurrence. Patients receiving re-treatment could receive rituximab every time they experienced progression, until treatment failure.

The median number of rituximab doses was 4 in the re-treatment arm and 18 in the maintenance arm. Three-year freedom from cytotoxic therapy was 84% in the re-treatment arm and 95% in the maintenance arm (P=0.03).

There was no significant difference between the arms in the time to disease recurrence. With a median follow-up of 4.5 years, the estimated median time to treatment failure was 3.9 years in the re-treatment arm and 4.3 years in the maintenance arm (P=0.54).

The researchers found no difference in health-related quality of life or anxiety between the treatment arms.

They also said grade 3 to 5 adverse events were infrequent in both arms. One patient developed progressive multifocal leukoencephalopathy after the 15th maintenance dose of rituximab and died.

Second malignancies were reported in 16 patients receiving re-treatment and 14 patients on maintenance therapy, but there were no obvious trends toward specific cancers.

“The study shows that a rituximab re-treatment strategy provides comparable disease control to a maintenance strategy in low-tumor-burden follicular lymphoma,” Dr Kahl said. “In addition, a re-treatment strategy is more cost-effective, as it requires about a quarter as much drug utilization.”

The study was accompanied by an editorial saying these results should change clinical practice.

 

 

Drugs in vials

Credit: Bill Branson

 

New research suggests maintenance therapy may not be necessary for patients with follicular lymphoma (FL) who have a low tumor burden.

Investigators compared rituximab re-treatment with rituximab maintenance in nearly 300 FL patients, and results showed no significant difference between the treatment groups in the time to disease recurrence.

The researchers also noted that the re-treatment strategy was more cost-effective.

“For those 2 reasons, we recommend a retreatment strategy over a maintenance strategy in this patient population,” said Brad S. Kahl, MD, of the University of Wisconsin in Madison.

Dr Kahl and his colleagues described this research—the RESORT trial—in the Journal of Clinical Oncology. Early results from this trial were previously presented at the 2011 ASH Annual Meeting.

The team evaluated 289 patients with previously untreated, low-tumor-burden FL. All patients responded to initial treatment with rituximab (4 doses).

Patients were then randomized to receive maintenance therapy—a single dose of rituximab every 3 months until treatment failure—or rituximab re-treatment upon disease recurrence. Patients receiving re-treatment could receive rituximab every time they experienced progression, until treatment failure.

The median number of rituximab doses was 4 in the re-treatment arm and 18 in the maintenance arm. Three-year freedom from cytotoxic therapy was 84% in the re-treatment arm and 95% in the maintenance arm (P=0.03).

There was no significant difference between the arms in the time to disease recurrence. With a median follow-up of 4.5 years, the estimated median time to treatment failure was 3.9 years in the re-treatment arm and 4.3 years in the maintenance arm (P=0.54).

The researchers found no difference in health-related quality of life or anxiety between the treatment arms.

They also said grade 3 to 5 adverse events were infrequent in both arms. One patient developed progressive multifocal leukoencephalopathy after the 15th maintenance dose of rituximab and died.

Second malignancies were reported in 16 patients receiving re-treatment and 14 patients on maintenance therapy, but there were no obvious trends toward specific cancers.

“The study shows that a rituximab re-treatment strategy provides comparable disease control to a maintenance strategy in low-tumor-burden follicular lymphoma,” Dr Kahl said. “In addition, a re-treatment strategy is more cost-effective, as it requires about a quarter as much drug utilization.”

The study was accompanied by an editorial saying these results should change clinical practice.

 

 

Drugs in vials

Credit: Bill Branson

 

New research suggests maintenance therapy may not be necessary for patients with follicular lymphoma (FL) who have a low tumor burden.

Investigators compared rituximab re-treatment with rituximab maintenance in nearly 300 FL patients, and results showed no significant difference between the treatment groups in the time to disease recurrence.

The researchers also noted that the re-treatment strategy was more cost-effective.

“For those 2 reasons, we recommend a retreatment strategy over a maintenance strategy in this patient population,” said Brad S. Kahl, MD, of the University of Wisconsin in Madison.

Dr Kahl and his colleagues described this research—the RESORT trial—in the Journal of Clinical Oncology. Early results from this trial were previously presented at the 2011 ASH Annual Meeting.

The team evaluated 289 patients with previously untreated, low-tumor-burden FL. All patients responded to initial treatment with rituximab (4 doses).

Patients were then randomized to receive maintenance therapy—a single dose of rituximab every 3 months until treatment failure—or rituximab re-treatment upon disease recurrence. Patients receiving re-treatment could receive rituximab every time they experienced progression, until treatment failure.

The median number of rituximab doses was 4 in the re-treatment arm and 18 in the maintenance arm. Three-year freedom from cytotoxic therapy was 84% in the re-treatment arm and 95% in the maintenance arm (P=0.03).

There was no significant difference between the arms in the time to disease recurrence. With a median follow-up of 4.5 years, the estimated median time to treatment failure was 3.9 years in the re-treatment arm and 4.3 years in the maintenance arm (P=0.54).

The researchers found no difference in health-related quality of life or anxiety between the treatment arms.

They also said grade 3 to 5 adverse events were infrequent in both arms. One patient developed progressive multifocal leukoencephalopathy after the 15th maintenance dose of rituximab and died.

Second malignancies were reported in 16 patients receiving re-treatment and 14 patients on maintenance therapy, but there were no obvious trends toward specific cancers.

“The study shows that a rituximab re-treatment strategy provides comparable disease control to a maintenance strategy in low-tumor-burden follicular lymphoma,” Dr Kahl said. “In addition, a re-treatment strategy is more cost-effective, as it requires about a quarter as much drug utilization.”

The study was accompanied by an editorial saying these results should change clinical practice.

Drug release in a cancer cell

Credit: PNAS

PHILADELPHIA—A combination treatment strategy that takes tumor evolution into account could help us avoid drug resistance in hematologic malignancies, researchers say.

Preclinical experiments suggest we can prevent resistance by starting secondary treatment prior to relapse.

For example, a patient receiving dasatinib for acute lymphoblastic leukemia (ALL) could benefit from receiving crizotinib or foretinib during the early stages of clonal evolution.

The researchers described this strategy in a poster at the AACR conference Hematologic Malignancies: Translating Discoveries to Novel Therapies.

“Our goal is to identify vulnerabilities in cancer across stages of tumor evolution while it is developing resistance to initial treatment, to help guide the design of drug combination strategies,” said Douglas Lauffenburger, PhD, of the Koch Institute for Integrative Cancer Research at MIT in Boston.

“There may be many stages in a tumor evolution while under treatment that may make them vulnerable to already existing therapies. Rather than waiting for the tumor to become resistant to the first treatment and then thinking about a second-line drug to use, we can capitalize on opportunities that exploit vulnerabilities at different early stages, as the tumor is evolving to become resistant to the first drug.”

Dr Lauffenburger and his colleagues used a combination of computational and experimental approaches to identify drugs likely to be effective against a murine ALL cell line as the cells evolve.

To develop drug combinations based on the characteristics of evolving tumors, the researchers used escalating doses of imatinib, dasatinib, nilotinib, foretinib, and crizotinib on ALL cells.

As some cells exhibited resistance to a particular drug, the team treated the resistant cells with other drugs to check for cross-resistance. They found that resistant cells surviving at low multiples of the original drug dose actually demonstrated sensitization to certain other drugs, with the sensitization abrogated at higher doses.

Specifically, cell populations that were resistant to dasatinib at 1x and 2x IC90 became even more sensitive to crizotinib and foretinib. However, the sensitivity was lost at IC90 4x and above.

“Instead of only looking for the most resistant population of ALL cells at the end of this selection process, we monitored for drug sensitivity of the cells at each stage of the dose escalation,” Dr Lauffenburger explained.

“This led us to discover the vulnerabilities of a tumor at different stages of clonal evolution, a phenomenon we would have missed if we only analyzed for drug sensitivity at the last stage of this process, which is equivalent to when a patient has relapsed.”

Drug release in a cancer cell

Credit: PNAS

PHILADELPHIA—A combination treatment strategy that takes tumor evolution into account could help us avoid drug resistance in hematologic malignancies, researchers say.

Preclinical experiments suggest we can prevent resistance by starting secondary treatment prior to relapse.

For example, a patient receiving dasatinib for acute lymphoblastic leukemia (ALL) could benefit from receiving crizotinib or foretinib during the early stages of clonal evolution.

The researchers described this strategy in a poster at the AACR conference Hematologic Malignancies: Translating Discoveries to Novel Therapies.

“Our goal is to identify vulnerabilities in cancer across stages of tumor evolution while it is developing resistance to initial treatment, to help guide the design of drug combination strategies,” said Douglas Lauffenburger, PhD, of the Koch Institute for Integrative Cancer Research at MIT in Boston.

“There may be many stages in a tumor evolution while under treatment that may make them vulnerable to already existing therapies. Rather than waiting for the tumor to become resistant to the first treatment and then thinking about a second-line drug to use, we can capitalize on opportunities that exploit vulnerabilities at different early stages, as the tumor is evolving to become resistant to the first drug.”

Dr Lauffenburger and his colleagues used a combination of computational and experimental approaches to identify drugs likely to be effective against a murine ALL cell line as the cells evolve.

To develop drug combinations based on the characteristics of evolving tumors, the researchers used escalating doses of imatinib, dasatinib, nilotinib, foretinib, and crizotinib on ALL cells.

As some cells exhibited resistance to a particular drug, the team treated the resistant cells with other drugs to check for cross-resistance. They found that resistant cells surviving at low multiples of the original drug dose actually demonstrated sensitization to certain other drugs, with the sensitization abrogated at higher doses.

Specifically, cell populations that were resistant to dasatinib at 1x and 2x IC90 became even more sensitive to crizotinib and foretinib. However, the sensitivity was lost at IC90 4x and above.

“Instead of only looking for the most resistant population of ALL cells at the end of this selection process, we monitored for drug sensitivity of the cells at each stage of the dose escalation,” Dr Lauffenburger explained.

“This led us to discover the vulnerabilities of a tumor at different stages of clonal evolution, a phenomenon we would have missed if we only analyzed for drug sensitivity at the last stage of this process, which is equivalent to when a patient has relapsed.”

Drug release in a cancer cell

Credit: PNAS

PHILADELPHIA—A combination treatment strategy that takes tumor evolution into account could help us avoid drug resistance in hematologic malignancies, researchers say.

Preclinical experiments suggest we can prevent resistance by starting secondary treatment prior to relapse.

For example, a patient receiving dasatinib for acute lymphoblastic leukemia (ALL) could benefit from receiving crizotinib or foretinib during the early stages of clonal evolution.

The researchers described this strategy in a poster at the AACR conference Hematologic Malignancies: Translating Discoveries to Novel Therapies.

“Our goal is to identify vulnerabilities in cancer across stages of tumor evolution while it is developing resistance to initial treatment, to help guide the design of drug combination strategies,” said Douglas Lauffenburger, PhD, of the Koch Institute for Integrative Cancer Research at MIT in Boston.

“There may be many stages in a tumor evolution while under treatment that may make them vulnerable to already existing therapies. Rather than waiting for the tumor to become resistant to the first treatment and then thinking about a second-line drug to use, we can capitalize on opportunities that exploit vulnerabilities at different early stages, as the tumor is evolving to become resistant to the first drug.”

Dr Lauffenburger and his colleagues used a combination of computational and experimental approaches to identify drugs likely to be effective against a murine ALL cell line as the cells evolve.

To develop drug combinations based on the characteristics of evolving tumors, the researchers used escalating doses of imatinib, dasatinib, nilotinib, foretinib, and crizotinib on ALL cells.

As some cells exhibited resistance to a particular drug, the team treated the resistant cells with other drugs to check for cross-resistance. They found that resistant cells surviving at low multiples of the original drug dose actually demonstrated sensitization to certain other drugs, with the sensitization abrogated at higher doses.

Specifically, cell populations that were resistant to dasatinib at 1x and 2x IC90 became even more sensitive to crizotinib and foretinib. However, the sensitivity was lost at IC90 4x and above.

“Instead of only looking for the most resistant population of ALL cells at the end of this selection process, we monitored for drug sensitivity of the cells at each stage of the dose escalation,” Dr Lauffenburger explained.

“This led us to discover the vulnerabilities of a tumor at different stages of clonal evolution, a phenomenon we would have missed if we only analyzed for drug sensitivity at the last stage of this process, which is equivalent to when a patient has relapsed.”

Malaria-infected cell bursting

Credit: Peter H. Seeberger

Investigators have identified 5 genes that appear to affect a person’s susceptibility to severe malaria.

The group’s analyses suggest that single-nucleotide polymorphisms (SNPs) in HBB, ABO, ATP2B4, G6PD, and CD40LG are associated with an increased or decreased risk of severe malaria, cerebral malaria, and severe malarial anemia.

This knowledge could lead to new therapeutics or vaccines to target severe malaria.

“[This study] has allowed for investigation of genes that influence susceptibility to malaria on a scale that has previously not been achieved,” said Sarah Dunstan, PhD, of the Oxford University Clinical Research Unit at the Hospital for Tropical Diseases in Ho Chi Minh City, Vietnam.

“It involved a large number of severe malaria patients from multiple countries, which allows us to identify genes that truly have an effect on whether or not you develop severe malaria.”

Dr Dunstan and her colleagues detailed this research in Nature Genetics.

The team collected data on 11,890 cases of severe malaria due to Plasmodium falciparum and 17,441 control subjects across 12 locations in countries of Africa, Asia, and Oceania.

The researchers tested 55 SNPs in 27 gene regions that were associated with severe malaria in previous research: ABO, ADORA2B, ATP2B4, C6, CD36, CD40LG, CR1, ACKR1 (DARC), G6PD, GNAS, HBB, ICAM1, IL1A, IL1B, IL4, IL10, IL13, IL22, IRF1, LTA, NOS2, SPTB, TLR1, TLR4, TLR6, TLR9, and TNF.

The team found evidence of associations with the HBB, ABO, ATP2B4, G6PD, and CD40LG loci, but no association for the other 22 loci.

HBB

The HBB gene encodes β-globin, which has 3 variants associated with resistance to malaria: hemoglobin S (HbS), hemoglobin C (HbC), and hemoglobin E (HbE). The SNP responsible for HbE, rs33950507, was rare or absent in most groups, so the sample was too small to estimate association with severe malaria.

However, for HbS (SNP rs334), heterozygotes had a reduced risk of severe malaria (odds ratio [OR]=0.14; P=1.6×10⁻²²⁵), cerebral malaria (OR=0.11; P=4.7×10⁻⁸⁸), and severe malarial anemia (OR=0.11; P=9.3×10⁻⁶⁵).

For HbC (SNP rs33930165), each copy of the derived allele reduced the risk of severe malaria by 29% (OR=0.71; P=6.9×10⁻⁹), cerebral malaria by 28% (OR=0.72; P=0.01), and severe malarial anemia by 26% (OR=0.74; P=2.1×10⁻³).

ABO

The ABO gene encodes the glycosyltransferase enzyme that determines ABO blood group. Blood group O was associated with a lower risk of severe malaria (OR=0.74; P=5.0×10⁻³²), cerebral malaria (OR=0.73; P=8.9×10⁻¹⁶), and severe malarial anemia (OR=0.68; P=7.9×10⁻¹⁴).

The researchers also found that rs8176746, an SNP in ABO that determines the production of B antigens, was associated with an increased risk of severe malaria (OR=1.25; P=2.0×10⁻¹⁷).

G6PD

G6PD is an X-linked gene encoding glucose-6-phosphate dehydrogenase. The investigators found that deficiency in G6PD (rs1050828 [G6PD c.202C>T]) can reduce the risk of cerebral malaria but increase the risk of severe malarial anemia.

There was an increased risk of severe malarial anemia in male hemizygotes (OR=1.49; P=3.6×10⁻⁵) and in female homozygotes (OR=1.94; P=1.9×10⁻³), as well as a decreased risk of cerebral malaria in female heterozygotes (OR=0.87; P=0.06) and male hemizygotes (OR=0.81; P=0.01).

ATP2B4

ATP2B4 encodes a calcium transporter found in the plasma membrane of erythrocytes. The derived alleles of rs10900585 and rs55868763 were associated with an increased risk of severe malaria, and the derived alleles of rs4951074 and rs1541255 were associated with a decreased risk.

Subjects with at least one copy of the derived allele at rs10900585 had an OR of 1.32 for severe malaria (P=1.7×10⁻⁹), and those homozygous for the derived allele at rs4951074 had an OR of 0.77 (P=7.6×10⁻⁷). Findings were similar for cerebral malaria and severe malarial anemia.

CD40LG

CD40LG is a gene on the X chromosome that has previously been associated with severe malaria. Homozygotes for the derived allele of rs3092945 had a decreased risk of severe malaria (OR=0.85; P=1.1×10⁻⁶) when the researchers analyzed data from the study sites together.

However, the results differed when they analyzed sites individually. For instance, homozygotes had a reduced risk of severe malaria in The Gambia (OR=0.54; P=2.3×10⁻²²) and an increased risk in Kenya (OR=1.42; P=7.8×10⁻⁶).

These findings suggest the role of common human genetic disorders in severe malaria is more complex than we thought, Dr Dunstan said. But the results should enable a better understanding of the mechanisms and processes at work during progression to severe disease.

Malaria-infected cell bursting

Credit: Peter H. Seeberger

Investigators have identified 5 genes that appear to affect a person’s susceptibility to severe malaria.

The group’s analyses suggest that single-nucleotide polymorphisms (SNPs) in HBB, ABO, ATP2B4, G6PD, and CD40LG are associated with an increased or decreased risk of severe malaria, cerebral malaria, and severe malarial anemia.

This knowledge could lead to new therapeutics or vaccines to target severe malaria.

“[This study] has allowed for investigation of genes that influence susceptibility to malaria on a scale that has previously not been achieved,” said Sarah Dunstan, PhD, of the Oxford University Clinical Research Unit at the Hospital for Tropical Diseases in Ho Chi Minh City, Vietnam.

“It involved a large number of severe malaria patients from multiple countries, which allows us to identify genes that truly have an effect on whether or not you develop severe malaria.”

Dr Dunstan and her colleagues detailed this research in Nature Genetics.

The team collected data on 11,890 cases of severe malaria due to Plasmodium falciparum and 17,441 control subjects across 12 locations in countries of Africa, Asia, and Oceania.

The researchers tested 55 SNPs in 27 gene regions that were associated with severe malaria in previous research: ABO, ADORA2B, ATP2B4, C6, CD36, CD40LG, CR1, ACKR1 (DARC), G6PD, GNAS, HBB, ICAM1, IL1A, IL1B, IL4, IL10, IL13, IL22, IRF1, LTA, NOS2, SPTB, TLR1, TLR4, TLR6, TLR9, and TNF.

The team found evidence of associations with the HBB, ABO, ATP2B4, G6PD, and CD40LG loci, but no association for the other 22 loci.

HBB

The HBB gene encodes β-globin, which has 3 variants associated with resistance to malaria: hemoglobin S (HbS), hemoglobin C (HbC), and hemoglobin E (HbE). The SNP responsible for HbE, rs33950507, was rare or absent in most groups, so the sample was too small to estimate association with severe malaria.

However, for HbS (SNP rs334), heterozygotes had a reduced risk of severe malaria (odds ratio [OR]=0.14; P=1.6×10⁻²²⁵), cerebral malaria (OR=0.11; P=4.7×10⁻⁸⁸), and severe malarial anemia (OR=0.11; P=9.3×10⁻⁶⁵).

For HbC (SNP rs33930165), each copy of the derived allele reduced the risk of severe malaria by 29% (OR=0.71; P=6.9×10⁻⁹), cerebral malaria by 28% (OR=0.72; P=0.01), and severe malarial anemia by 26% (OR=0.74; P=2.1×10⁻³).

ABO

The ABO gene encodes the glycosyltransferase enzyme that determines ABO blood group. Blood group O was associated with a lower risk of severe malaria (OR=0.74; P=5.0×10⁻³²), cerebral malaria (OR=0.73; P=8.9×10⁻¹⁶), and severe malarial anemia (OR=0.68; P=7.9×10⁻¹⁴).

The researchers also found that rs8176746, an SNP in ABO that determines the production of B antigens, was associated with an increased risk of severe malaria (OR=1.25; P=2.0×10⁻¹⁷).

G6PD

G6PD is an X-linked gene encoding glucose-6-phosphate dehydrogenase. The investigators found that deficiency in G6PD (rs1050828 [G6PD c.202C>T]) can reduce the risk of cerebral malaria but increase the risk of severe malarial anemia.

There was an increased risk of severe malarial anemia in male hemizygotes (OR=1.49; P=3.6×10⁻⁵) and in female homozygotes (OR=1.94; P=1.9×10⁻³), as well as a decreased risk of cerebral malaria in female heterozygotes (OR=0.87; P=0.06) and male hemizygotes (OR=0.81; P=0.01).

ATP2B4

ATP2B4 encodes a calcium transporter found in the plasma membrane of erythrocytes. The derived alleles of rs10900585 and rs55868763 were associated with an increased risk of severe malaria, and the derived alleles of rs4951074 and rs1541255 were associated with a decreased risk.

Subjects with at least one copy of the derived allele at rs10900585 had an OR of 1.32 for severe malaria (P=1.7×10⁻⁹), and those homozygous for the derived allele at rs4951074 had an OR of 0.77 (P=7.6×10⁻⁷). Findings were similar for cerebral malaria and severe malarial anemia.

CD40LG

CD40LG is a gene on the X chromosome that has previously been associated with severe malaria. Homozygotes for the derived allele of rs3092945 had a decreased risk of severe malaria (OR=0.85; P=1.1×10⁻⁶) when the researchers analyzed data from the study sites together.

However, the results differed when they analyzed sites individually. For instance, homozygotes had a reduced risk of severe malaria in The Gambia (OR=0.54; P=2.3×10⁻²²) and an increased risk in Kenya (OR=1.42; P=7.8×10⁻⁶).

These findings suggest the role of common human genetic disorders in severe malaria is more complex than we thought, Dr Dunstan said. But the results should enable a better understanding of the mechanisms and processes at work during progression to severe disease.

Malaria-infected cell bursting

Credit: Peter H. Seeberger

Investigators have identified 5 genes that appear to affect a person’s susceptibility to severe malaria.

The group’s analyses suggest that single-nucleotide polymorphisms (SNPs) in HBB, ABO, ATP2B4, G6PD, and CD40LG are associated with an increased or decreased risk of severe malaria, cerebral malaria, and severe malarial anemia.

This knowledge could lead to new therapeutics or vaccines to target severe malaria.

“[This study] has allowed for investigation of genes that influence susceptibility to malaria on a scale that has previously not been achieved,” said Sarah Dunstan, PhD, of the Oxford University Clinical Research Unit at the Hospital for Tropical Diseases in Ho Chi Minh City, Vietnam.

“It involved a large number of severe malaria patients from multiple countries, which allows us to identify genes that truly have an effect on whether or not you develop severe malaria.”

Dr Dunstan and her colleagues detailed this research in Nature Genetics.

The team collected data on 11,890 cases of severe malaria due to Plasmodium falciparum and 17,441 control subjects across 12 locations in countries of Africa, Asia, and Oceania.

The researchers tested 55 SNPs in 27 gene regions that were associated with severe malaria in previous research: ABO, ADORA2B, ATP2B4, C6, CD36, CD40LG, CR1, ACKR1 (DARC), G6PD, GNAS, HBB, ICAM1, IL1A, IL1B, IL4, IL10, IL13, IL22, IRF1, LTA, NOS2, SPTB, TLR1, TLR4, TLR6, TLR9, and TNF.

The team found evidence of associations with the HBB, ABO, ATP2B4, G6PD, and CD40LG loci, but no association for the other 22 loci.

HBB

The HBB gene encodes β-globin, which has 3 variants associated with resistance to malaria: hemoglobin S (HbS), hemoglobin C (HbC), and hemoglobin E (HbE). The SNP responsible for HbE, rs33950507, was rare or absent in most groups, so the sample was too small to estimate association with severe malaria.

However, for HbS (SNP rs334), heterozygotes had a reduced risk of severe malaria (odds ratio [OR]=0.14; P=1.6×10⁻²²⁵), cerebral malaria (OR=0.11; P=4.7×10⁻⁸⁸), and severe malarial anemia (OR=0.11; P=9.3×10⁻⁶⁵).

For HbC (SNP rs33930165), each copy of the derived allele reduced the risk of severe malaria by 29% (OR=0.71; P=6.9×10⁻⁹), cerebral malaria by 28% (OR=0.72; P=0.01), and severe malarial anemia by 26% (OR=0.74; P=2.1×10⁻³).

ABO

The ABO gene encodes the glycosyltransferase enzyme that determines ABO blood group. Blood group O was associated with a lower risk of severe malaria (OR=0.74; P=5.0×10⁻³²), cerebral malaria (OR=0.73; P=8.9×10⁻¹⁶), and severe malarial anemia (OR=0.68; P=7.9×10⁻¹⁴).

The researchers also found that rs8176746, an SNP in ABO that determines the production of B antigens, was associated with an increased risk of severe malaria (OR=1.25; P=2.0×10⁻¹⁷).

G6PD

G6PD is an X-linked gene encoding glucose-6-phosphate dehydrogenase. The investigators found that deficiency in G6PD (rs1050828 [G6PD c.202C>T]) can reduce the risk of cerebral malaria but increase the risk of severe malarial anemia.

There was an increased risk of severe malarial anemia in male hemizygotes (OR=1.49; P=3.6×10⁻⁵) and in female homozygotes (OR=1.94; P=1.9×10⁻³), as well as a decreased risk of cerebral malaria in female heterozygotes (OR=0.87; P=0.06) and male hemizygotes (OR=0.81; P=0.01).

ATP2B4

ATP2B4 encodes a calcium transporter found in the plasma membrane of erythrocytes. The derived alleles of rs10900585 and rs55868763 were associated with an increased risk of severe malaria, and the derived alleles of rs4951074 and rs1541255 were associated with a decreased risk.

Subjects with at least one copy of the derived allele at rs10900585 had an OR of 1.32 for severe malaria (P=1.7×10⁻⁹), and those homozygous for the derived allele at rs4951074 had an OR of 0.77 (P=7.6×10⁻⁷). Findings were similar for cerebral malaria and severe malarial anemia.

CD40LG

CD40LG is a gene on the X chromosome that has previously been associated with severe malaria. Homozygotes for the derived allele of rs3092945 had a decreased risk of severe malaria (OR=0.85; P=1.1×10⁻⁶) when the researchers analyzed data from the study sites together.

However, the results differed when they analyzed sites individually. For instance, homozygotes had a reduced risk of severe malaria in The Gambia (OR=0.54; P=2.3×10⁻²²) and an increased risk in Kenya (OR=1.42; P=7.8×10⁻⁶).

These findings suggest the role of common human genetic disorders in severe malaria is more complex than we thought, Dr Dunstan said. But the results should enable a better understanding of the mechanisms and processes at work during progression to severe disease.

Bottles of vinegar

Credit: Georges Seguin

Acetate, the major component of vinegar, can stimulate erythropoiesis in anemic mice, according to research published in Nature Medicine.

The study suggests acetate supplements could eventually be a suitable addition or even an alternative to erythropoietin (EPO) therapy.

“[W]e may be able to treat acutely or chronically anemic patients with acetate supplements and thereby reduce the need for blood transfusions or erythropoietin therapy,” said Joseph Garcia, MD, PhD, of the UT Southwestern Medical Center in Dallas, Texas.

He and his colleagues began this study by identifying a pathway that controls erythropoiesis in conditions of stress, such as hypoxia.

Studying genetically modified mice, the researchers discovered that hypoxia stimulates the production of acetate. Acetate, in turn, activates a molecular pathway that ultimately results in erythropoiesis by triggering EPO production.

EPO is regulated by the stress-responsive transcription factor hypoxia-inducible factor-2 (HIF-2). And the researchers had previously shown that the lysine acetyltransferase CREB-binding protein (CBP) is required for HIF-2a acetylation and efficient HIF-2-dependent EPO induction during hypoxia.

With this study, the team found that these processes require acetate-dependent acetyl CoA synthetase 2 (ACSS2) as well.

Experiments showed that ACSS2 is required for HIF-2a acetylation, CBP-HIF-2a complex formation, CBP-HIF-2a recruitment to the EPO enhancer, and efficient induction of EPO gene expression.

The researchers administered acetate to acutely anemic mice and found the treatment augments stress erythropoiesis in an ACSS2-dependent manner.

When they administered acetate to mice with acquired and inherited chronic anemia, the team observed increases in EPO expression and resting hematocrit.

“Our study shows that acetate functions as a biochemical ‘flare,’” Dr Garcia said, “linking changes in cell metabolism that occur during hypoxia with the activation of a selective stress signaling pathway.”

Bottles of vinegar

Credit: Georges Seguin

Acetate, the major component of vinegar, can stimulate erythropoiesis in anemic mice, according to research published in Nature Medicine.

The study suggests acetate supplements could eventually be a suitable addition or even an alternative to erythropoietin (EPO) therapy.

“[W]e may be able to treat acutely or chronically anemic patients with acetate supplements and thereby reduce the need for blood transfusions or erythropoietin therapy,” said Joseph Garcia, MD, PhD, of the UT Southwestern Medical Center in Dallas, Texas.

He and his colleagues began this study by identifying a pathway that controls erythropoiesis in conditions of stress, such as hypoxia.

Studying genetically modified mice, the researchers discovered that hypoxia stimulates the production of acetate. Acetate, in turn, activates a molecular pathway that ultimately results in erythropoiesis by triggering EPO production.

EPO is regulated by the stress-responsive transcription factor hypoxia-inducible factor-2 (HIF-2). And the researchers had previously shown that the lysine acetyltransferase CREB-binding protein (CBP) is required for HIF-2a acetylation and efficient HIF-2-dependent EPO induction during hypoxia.

With this study, the team found that these processes require acetate-dependent acetyl CoA synthetase 2 (ACSS2) as well.

Experiments showed that ACSS2 is required for HIF-2a acetylation, CBP-HIF-2a complex formation, CBP-HIF-2a recruitment to the EPO enhancer, and efficient induction of EPO gene expression.

The researchers administered acetate to acutely anemic mice and found the treatment augments stress erythropoiesis in an ACSS2-dependent manner.

When they administered acetate to mice with acquired and inherited chronic anemia, the team observed increases in EPO expression and resting hematocrit.

“Our study shows that acetate functions as a biochemical ‘flare,’” Dr Garcia said, “linking changes in cell metabolism that occur during hypoxia with the activation of a selective stress signaling pathway.”

Bottles of vinegar

Credit: Georges Seguin

Acetate, the major component of vinegar, can stimulate erythropoiesis in anemic mice, according to research published in Nature Medicine.

The study suggests acetate supplements could eventually be a suitable addition or even an alternative to erythropoietin (EPO) therapy.

“[W]e may be able to treat acutely or chronically anemic patients with acetate supplements and thereby reduce the need for blood transfusions or erythropoietin therapy,” said Joseph Garcia, MD, PhD, of the UT Southwestern Medical Center in Dallas, Texas.

He and his colleagues began this study by identifying a pathway that controls erythropoiesis in conditions of stress, such as hypoxia.

Studying genetically modified mice, the researchers discovered that hypoxia stimulates the production of acetate. Acetate, in turn, activates a molecular pathway that ultimately results in erythropoiesis by triggering EPO production.

EPO is regulated by the stress-responsive transcription factor hypoxia-inducible factor-2 (HIF-2). And the researchers had previously shown that the lysine acetyltransferase CREB-binding protein (CBP) is required for HIF-2a acetylation and efficient HIF-2-dependent EPO induction during hypoxia.

With this study, the team found that these processes require acetate-dependent acetyl CoA synthetase 2 (ACSS2) as well.

Experiments showed that ACSS2 is required for HIF-2a acetylation, CBP-HIF-2a complex formation, CBP-HIF-2a recruitment to the EPO enhancer, and efficient induction of EPO gene expression.

The researchers administered acetate to acutely anemic mice and found the treatment augments stress erythropoiesis in an ACSS2-dependent manner.

When they administered acetate to mice with acquired and inherited chronic anemia, the team observed increases in EPO expression and resting hematocrit.

“Our study shows that acetate functions as a biochemical ‘flare,’” Dr Garcia said, “linking changes in cell metabolism that occur during hypoxia with the activation of a selective stress signaling pathway.”

Oncologists are increasingly being called on to address obesity in cancer patients as the rates of obesity are increasing and more cancer patients are becoming cancer survivors, according to a position statement on obesity and cancer from the American Society of Clinical Oncology.

Obesity appears to have negative downstream effects for cancer risk, recurrence, and mortality. As many as 84,000 cancer diagnoses each year are attributed to obesity, and overweight and obesity are implicated in 15%-20% of total cancer-related mortality,” wrote Dr. Jennifer A. Ligibel from the Dana-Farber Cancer Institute, Boston, and her colleagues in the statement, which calls for increased education, clinical guidance, research, and advocacy on the issue.

Evidence suggests that obese individuals have a significantly worse prognosis than do nonobese patients. One meta-analysis found a 75% increase in mortality in premenopausal women who were obese at the time of breast cancer diagnosis, compared with normal-weight patients. Further, obesity can interfere with the delivery of cancer therapy and is associated with increases in the risk of second primary malignancies, according to the paper published Oct.1 in the Journal of Clinical Oncology.

Dr. Ligibel and her colleagues said many individuals initiate positive health behavior changes after a cancer diagnosis, and such a point can therefore serve as a “teachable moment” that may offer the chance to motivate individuals to implement lifestyle and behavioral changes.

The statement advised assessing patients’ weight by calculating BMI and referring patients to appropriate services such as oncology nutrition, rehabilitation medicine, and exercise physiology. Oncologists also are encouraged to lead by example and to share their personal experiences at attempts to lose weight and to increase physical activity. Participating in community events focused on physical activity and healthy living “can also reinforce the importance of health lifestyle behaviors as part of a a comprehensive cancer-control strategy,” the statement said.

ASCO also announced that it will host a summit to assemble groups needed to conduct lifestyle intervention research in cancer survivors and urged studies of lifestyle changes on outcomes in patients with early-stage cancers.

Additionally, ASCO has developed a toolkit to assist in addressing weight management, including strategies for improving nutrition and physical activity as well as insurance coverage for weight-management services.

The authors declared no conflicts of interest.

Oncologists are increasingly being called on to address obesity in cancer patients as the rates of obesity are increasing and more cancer patients are becoming cancer survivors, according to a position statement on obesity and cancer from the American Society of Clinical Oncology.

Obesity appears to have negative downstream effects for cancer risk, recurrence, and mortality. As many as 84,000 cancer diagnoses each year are attributed to obesity, and overweight and obesity are implicated in 15%-20% of total cancer-related mortality,” wrote Dr. Jennifer A. Ligibel from the Dana-Farber Cancer Institute, Boston, and her colleagues in the statement, which calls for increased education, clinical guidance, research, and advocacy on the issue.

Evidence suggests that obese individuals have a significantly worse prognosis than do nonobese patients. One meta-analysis found a 75% increase in mortality in premenopausal women who were obese at the time of breast cancer diagnosis, compared with normal-weight patients. Further, obesity can interfere with the delivery of cancer therapy and is associated with increases in the risk of second primary malignancies, according to the paper published Oct.1 in the Journal of Clinical Oncology.

Dr. Ligibel and her colleagues said many individuals initiate positive health behavior changes after a cancer diagnosis, and such a point can therefore serve as a “teachable moment” that may offer the chance to motivate individuals to implement lifestyle and behavioral changes.

The statement advised assessing patients’ weight by calculating BMI and referring patients to appropriate services such as oncology nutrition, rehabilitation medicine, and exercise physiology. Oncologists also are encouraged to lead by example and to share their personal experiences at attempts to lose weight and to increase physical activity. Participating in community events focused on physical activity and healthy living “can also reinforce the importance of health lifestyle behaviors as part of a a comprehensive cancer-control strategy,” the statement said.

ASCO also announced that it will host a summit to assemble groups needed to conduct lifestyle intervention research in cancer survivors and urged studies of lifestyle changes on outcomes in patients with early-stage cancers.

Additionally, ASCO has developed a toolkit to assist in addressing weight management, including strategies for improving nutrition and physical activity as well as insurance coverage for weight-management services.

The authors declared no conflicts of interest.

Oncologists are increasingly being called on to address obesity in cancer patients as the rates of obesity are increasing and more cancer patients are becoming cancer survivors, according to a position statement on obesity and cancer from the American Society of Clinical Oncology.

Obesity appears to have negative downstream effects for cancer risk, recurrence, and mortality. As many as 84,000 cancer diagnoses each year are attributed to obesity, and overweight and obesity are implicated in 15%-20% of total cancer-related mortality,” wrote Dr. Jennifer A. Ligibel from the Dana-Farber Cancer Institute, Boston, and her colleagues in the statement, which calls for increased education, clinical guidance, research, and advocacy on the issue.

Evidence suggests that obese individuals have a significantly worse prognosis than do nonobese patients. One meta-analysis found a 75% increase in mortality in premenopausal women who were obese at the time of breast cancer diagnosis, compared with normal-weight patients. Further, obesity can interfere with the delivery of cancer therapy and is associated with increases in the risk of second primary malignancies, according to the paper published Oct.1 in the Journal of Clinical Oncology.

Dr. Ligibel and her colleagues said many individuals initiate positive health behavior changes after a cancer diagnosis, and such a point can therefore serve as a “teachable moment” that may offer the chance to motivate individuals to implement lifestyle and behavioral changes.

The statement advised assessing patients’ weight by calculating BMI and referring patients to appropriate services such as oncology nutrition, rehabilitation medicine, and exercise physiology. Oncologists also are encouraged to lead by example and to share their personal experiences at attempts to lose weight and to increase physical activity. Participating in community events focused on physical activity and healthy living “can also reinforce the importance of health lifestyle behaviors as part of a a comprehensive cancer-control strategy,” the statement said.

ASCO also announced that it will host a summit to assemble groups needed to conduct lifestyle intervention research in cancer survivors and urged studies of lifestyle changes on outcomes in patients with early-stage cancers.

Additionally, ASCO has developed a toolkit to assist in addressing weight management, including strategies for improving nutrition and physical activity as well as insurance coverage for weight-management services.

The authors declared no conflicts of interest.

Combining nonsteroidal anti-inflammatory drugs with selective serotonin reuptake inhibitors increased the risk of upper gastrointestinal bleeding by up to 190% beyond the baseline risk found for NSAID monotherapy, researchers reported in the October issue of Gastroenterology.

Patients also faced excess risks of upper GI bleeding when they took corticosteroids, aldosterone antagonists, or anticoagulants together with low-dose aspirin or nonselective NSAIDs, although the effect was not seen for COX-2 inhibitors, said Dr. Gwen Masclee at Erasmus Medical Center in Rotterdam, the Netherlands and her associates.

© khuntapol / ThinkStockPhotos.com

Source: American Gastroenterological Association

The findings should help clinicians tailor treatments to minimize chances of upper gastrointestinal bleeding, particularly for elderly patients who often take multiple drugs, the investigators said (Gastroenterology 2014 [doi:10.1053/j.gastro.2014.06.007]).

The researchers analyzed 114,835 cases of upper gastrointestinal bleeding, including all gastroduodenal ulcers and hemorrhages extracted from seven electronic health record databases from the Netherlands, Italy, and Denmark. Three databases included primary care data, and four were administrative claims data, the investigators said. Cases served as their own controls, they noted.

Monotherapy with prescription nonselective NSAIDs increased the chances of an upper gastrointestinal bleed by 4.3 times, compared with not using any of the drugs studied (95% confidence interval, 4.1-4.4), the researchers said. Notably, bleeding risk from taking either nonselective NSAIDs or corticosteroids was the same, they said, adding that previous studies have yielded inconsistent findings on the topic. The incidence ratios for monotherapy with low-dose aspirin and COX-2 inhibitors were slightly lower at 3.1 (95% CI, 2.9-3.2) and 2.9 (95% CI, 2.7-3.2), respectively, they added.

Combining nonselective NSAIDs, COX-2 inhibitors, or low-dose aspirin with SSRIs led to excess risks of upper gastrointestinal bleeding of 1.6 (95% CI, 0.5-2.6), 1.9 (95% CI, 0.2-3.4), and 0.49 (–0.05-1.03), respectively, the researchers reported. "From a biological point of view, this interaction seems plausible because SSRIs decrease the serotonin level, resulting in impaired thrombocyte aggregation and an increased risk of bleeding in general," they said.

Corticosteroids combined with nonselective NSAIDs led to the greatest increases in bleeding risk, with an incidence ratio of 12.8 (95% CI, 11.1-14.7), compared with nonuse of any drug studied, and an excess risk of 5.5 (3.7-7.3), compared with NSAID use alone, said the researchers. Adding aldosterone antagonists to nonselective NSAIDs led to an excess risk of 4.46, compared with using nonselective NSAIDs alone, they reported (95% CI, 1.79-7.13).

Because the study did not capture over-the-counter NSAID prescriptions, it could have underestimated use of these drugs, the investigators said. Also, changes in health or NSAID use during the study could have created residual confounding, although sensitivity analyses did not reveal problems, they reported. They added that misclassification of some data could have led them to underestimate risks. "Finally, we did not take any carryover effect or dose of drug exposure into account, which potentially limits the generalizability concerning causality of the associations," they concluded.

Five authors reported employment or other financial support from Erasmus University Medical Center, AstraZeneca, Janssen, PHARMO Institute, and the European Medicines Agency. The other authors reported no relevant conflicts of interests.

Combining nonsteroidal anti-inflammatory drugs with selective serotonin reuptake inhibitors increased the risk of upper gastrointestinal bleeding by up to 190% beyond the baseline risk found for NSAID monotherapy, researchers reported in the October issue of Gastroenterology.

Patients also faced excess risks of upper GI bleeding when they took corticosteroids, aldosterone antagonists, or anticoagulants together with low-dose aspirin or nonselective NSAIDs, although the effect was not seen for COX-2 inhibitors, said Dr. Gwen Masclee at Erasmus Medical Center in Rotterdam, the Netherlands and her associates.

© khuntapol / ThinkStockPhotos.com

Source: American Gastroenterological Association

The findings should help clinicians tailor treatments to minimize chances of upper gastrointestinal bleeding, particularly for elderly patients who often take multiple drugs, the investigators said (Gastroenterology 2014 [doi:10.1053/j.gastro.2014.06.007]).

The researchers analyzed 114,835 cases of upper gastrointestinal bleeding, including all gastroduodenal ulcers and hemorrhages extracted from seven electronic health record databases from the Netherlands, Italy, and Denmark. Three databases included primary care data, and four were administrative claims data, the investigators said. Cases served as their own controls, they noted.

Monotherapy with prescription nonselective NSAIDs increased the chances of an upper gastrointestinal bleed by 4.3 times, compared with not using any of the drugs studied (95% confidence interval, 4.1-4.4), the researchers said. Notably, bleeding risk from taking either nonselective NSAIDs or corticosteroids was the same, they said, adding that previous studies have yielded inconsistent findings on the topic. The incidence ratios for monotherapy with low-dose aspirin and COX-2 inhibitors were slightly lower at 3.1 (95% CI, 2.9-3.2) and 2.9 (95% CI, 2.7-3.2), respectively, they added.

Combining nonselective NSAIDs, COX-2 inhibitors, or low-dose aspirin with SSRIs led to excess risks of upper gastrointestinal bleeding of 1.6 (95% CI, 0.5-2.6), 1.9 (95% CI, 0.2-3.4), and 0.49 (–0.05-1.03), respectively, the researchers reported. "From a biological point of view, this interaction seems plausible because SSRIs decrease the serotonin level, resulting in impaired thrombocyte aggregation and an increased risk of bleeding in general," they said.

Corticosteroids combined with nonselective NSAIDs led to the greatest increases in bleeding risk, with an incidence ratio of 12.8 (95% CI, 11.1-14.7), compared with nonuse of any drug studied, and an excess risk of 5.5 (3.7-7.3), compared with NSAID use alone, said the researchers. Adding aldosterone antagonists to nonselective NSAIDs led to an excess risk of 4.46, compared with using nonselective NSAIDs alone, they reported (95% CI, 1.79-7.13).

Because the study did not capture over-the-counter NSAID prescriptions, it could have underestimated use of these drugs, the investigators said. Also, changes in health or NSAID use during the study could have created residual confounding, although sensitivity analyses did not reveal problems, they reported. They added that misclassification of some data could have led them to underestimate risks. "Finally, we did not take any carryover effect or dose of drug exposure into account, which potentially limits the generalizability concerning causality of the associations," they concluded.

Five authors reported employment or other financial support from Erasmus University Medical Center, AstraZeneca, Janssen, PHARMO Institute, and the European Medicines Agency. The other authors reported no relevant conflicts of interests.

Combining nonsteroidal anti-inflammatory drugs with selective serotonin reuptake inhibitors increased the risk of upper gastrointestinal bleeding by up to 190% beyond the baseline risk found for NSAID monotherapy, researchers reported in the October issue of Gastroenterology.

Patients also faced excess risks of upper GI bleeding when they took corticosteroids, aldosterone antagonists, or anticoagulants together with low-dose aspirin or nonselective NSAIDs, although the effect was not seen for COX-2 inhibitors, said Dr. Gwen Masclee at Erasmus Medical Center in Rotterdam, the Netherlands and her associates.

© khuntapol / ThinkStockPhotos.com

Source: American Gastroenterological Association

The findings should help clinicians tailor treatments to minimize chances of upper gastrointestinal bleeding, particularly for elderly patients who often take multiple drugs, the investigators said (Gastroenterology 2014 [doi:10.1053/j.gastro.2014.06.007]).

The researchers analyzed 114,835 cases of upper gastrointestinal bleeding, including all gastroduodenal ulcers and hemorrhages extracted from seven electronic health record databases from the Netherlands, Italy, and Denmark. Three databases included primary care data, and four were administrative claims data, the investigators said. Cases served as their own controls, they noted.

Monotherapy with prescription nonselective NSAIDs increased the chances of an upper gastrointestinal bleed by 4.3 times, compared with not using any of the drugs studied (95% confidence interval, 4.1-4.4), the researchers said. Notably, bleeding risk from taking either nonselective NSAIDs or corticosteroids was the same, they said, adding that previous studies have yielded inconsistent findings on the topic. The incidence ratios for monotherapy with low-dose aspirin and COX-2 inhibitors were slightly lower at 3.1 (95% CI, 2.9-3.2) and 2.9 (95% CI, 2.7-3.2), respectively, they added.

Combining nonselective NSAIDs, COX-2 inhibitors, or low-dose aspirin with SSRIs led to excess risks of upper gastrointestinal bleeding of 1.6 (95% CI, 0.5-2.6), 1.9 (95% CI, 0.2-3.4), and 0.49 (–0.05-1.03), respectively, the researchers reported. "From a biological point of view, this interaction seems plausible because SSRIs decrease the serotonin level, resulting in impaired thrombocyte aggregation and an increased risk of bleeding in general," they said.

Corticosteroids combined with nonselective NSAIDs led to the greatest increases in bleeding risk, with an incidence ratio of 12.8 (95% CI, 11.1-14.7), compared with nonuse of any drug studied, and an excess risk of 5.5 (3.7-7.3), compared with NSAID use alone, said the researchers. Adding aldosterone antagonists to nonselective NSAIDs led to an excess risk of 4.46, compared with using nonselective NSAIDs alone, they reported (95% CI, 1.79-7.13).

Because the study did not capture over-the-counter NSAID prescriptions, it could have underestimated use of these drugs, the investigators said. Also, changes in health or NSAID use during the study could have created residual confounding, although sensitivity analyses did not reveal problems, they reported. They added that misclassification of some data could have led them to underestimate risks. "Finally, we did not take any carryover effect or dose of drug exposure into account, which potentially limits the generalizability concerning causality of the associations," they concluded.

Five authors reported employment or other financial support from Erasmus University Medical Center, AstraZeneca, Janssen, PHARMO Institute, and the European Medicines Agency. The other authors reported no relevant conflicts of interests.

Pediatric inflammatory bowel disease grew by more than 40% in a 15-year period in Ontario, Canada, according to a retrospective cohort study published in the October issue of Gastroenterology.

Although rates of inflammatory bowel disease (IBD) rose in children and adolescents of all ages, the steepest increase occurred in children with very-early-onset IBD (VEO-IBD), defined as disease diagnosed before they were 10 years old, said Dr. Eric Benchimol at the University of Ottawa and his associates. But these patients also tended to use fewer health services and have fewer surgeries for IBD, compared with older children with the disease, the investigators said (Gastroenterology 2014 October [doi.org/10.1053/j.gastro.2014.06.023]).

Source: American Gastroenterological Association

The findings add to research indicating that VEO-IBD is a distinct form of IBD and indicate the need to assess subgroups of these patients to look at phenotype, genotype, intestinal microbiome, and treatment response, the investigators said.

For the study, researchers created a cohort based on an algorithm of health care visits that identified all children and adolescents in Ontario diagnosed with IBD before age 18 years. The analysis included 7,143 patients with IBD, among whom about 14% had VEO-IBD, the investigators reported.

The overall rate of IBD in children up to 18 years old increased from 9.4 to 13.2 cases per 100,000 population from 1994 through 2009 (P less than .0001), the researchers said. And the yearly increase in VEO-IBD averaged 7.4% – more than three times greater than the 2.2% average annual rise among children diagnosed at 10 years and older, the investigators reported.

But health care utilization trends did not mirror changes in incidence, Dr. Benchimol and associates reported. For example, children diagnosed before they were 6 years old had significantly fewer outpatient visits for IBD, compared with children diagnosed at 10 years and older (odds ratio for girls, 0.67; 95% confidence interval, 0.58-0.78; OR for boys, 0.86; 95% CI, 0.75-0.98). Furthermore, patients diagnosed before age 6 years were less likely to be hospitalized for IBD than were older children with the disease (hazard ratio for girls, 0.70; 95% CI, 0.56-0.87; HR for boys, 1.12; 95% CI, 0.94-1.33), the investigators said.

The likelihood of undergoing intestinal resection also was lower for children diagnosed before age 6 years with Crohn’s disease, compared with older girls (HR, 0.35; 95% CI, 0.16-0.78) and boys (HR, 0.59; 95% CI, 0.34-0.99), said the researchers. And patients diagnosed before age 6 years with ulcerative colitis were less likely to undergo colectomy than were older girls (HR, 0.88; 95% CI, 0.47-1.63) and boys (HR, 0.42; 95% CI, 0.21-0.85). In contrast, rates of IBD-related surgery and hospitalization were similar between children diagnosed at 6-9.9 years of age and those diagnosed at age 10 up to 18 years, the investigators said.

A cohort study from the United States also found a lower likelihood of surgery in children with VEO-IBD, the researchers noted. Large-bowel involvement without ileal disease is prominent in young children with IBD, and these patients might be unlikely to undergo resection because colectomy requires a permanent ostotomy, they added.

The work was supported by the American College of Gastroenterology, the Ontario Ministry of Health and Long-Term Care, the Canadian Institutes of Health Research, the Crohn’s and Colitis Foundation of Canada, the National Institutes of Health, the Wolpow Family Chair in IBD Treatment and Research, the Ontario Ministry of Research and Innovation, and the Leona M. and Harry B. Helmsley Charitable Trust. The authors reported no conflicts of interest.

Pediatric inflammatory bowel disease grew by more than 40% in a 15-year period in Ontario, Canada, according to a retrospective cohort study published in the October issue of Gastroenterology.

Although rates of inflammatory bowel disease (IBD) rose in children and adolescents of all ages, the steepest increase occurred in children with very-early-onset IBD (VEO-IBD), defined as disease diagnosed before they were 10 years old, said Dr. Eric Benchimol at the University of Ottawa and his associates. But these patients also tended to use fewer health services and have fewer surgeries for IBD, compared with older children with the disease, the investigators said (Gastroenterology 2014 October [doi.org/10.1053/j.gastro.2014.06.023]).

Source: American Gastroenterological Association

The findings add to research indicating that VEO-IBD is a distinct form of IBD and indicate the need to assess subgroups of these patients to look at phenotype, genotype, intestinal microbiome, and treatment response, the investigators said.

For the study, researchers created a cohort based on an algorithm of health care visits that identified all children and adolescents in Ontario diagnosed with IBD before age 18 years. The analysis included 7,143 patients with IBD, among whom about 14% had VEO-IBD, the investigators reported.

The overall rate of IBD in children up to 18 years old increased from 9.4 to 13.2 cases per 100,000 population from 1994 through 2009 (P less than .0001), the researchers said. And the yearly increase in VEO-IBD averaged 7.4% – more than three times greater than the 2.2% average annual rise among children diagnosed at 10 years and older, the investigators reported.

But health care utilization trends did not mirror changes in incidence, Dr. Benchimol and associates reported. For example, children diagnosed before they were 6 years old had significantly fewer outpatient visits for IBD, compared with children diagnosed at 10 years and older (odds ratio for girls, 0.67; 95% confidence interval, 0.58-0.78; OR for boys, 0.86; 95% CI, 0.75-0.98). Furthermore, patients diagnosed before age 6 years were less likely to be hospitalized for IBD than were older children with the disease (hazard ratio for girls, 0.70; 95% CI, 0.56-0.87; HR for boys, 1.12; 95% CI, 0.94-1.33), the investigators said.

The likelihood of undergoing intestinal resection also was lower for children diagnosed before age 6 years with Crohn’s disease, compared with older girls (HR, 0.35; 95% CI, 0.16-0.78) and boys (HR, 0.59; 95% CI, 0.34-0.99), said the researchers. And patients diagnosed before age 6 years with ulcerative colitis were less likely to undergo colectomy than were older girls (HR, 0.88; 95% CI, 0.47-1.63) and boys (HR, 0.42; 95% CI, 0.21-0.85). In contrast, rates of IBD-related surgery and hospitalization were similar between children diagnosed at 6-9.9 years of age and those diagnosed at age 10 up to 18 years, the investigators said.

A cohort study from the United States also found a lower likelihood of surgery in children with VEO-IBD, the researchers noted. Large-bowel involvement without ileal disease is prominent in young children with IBD, and these patients might be unlikely to undergo resection because colectomy requires a permanent ostotomy, they added.

The work was supported by the American College of Gastroenterology, the Ontario Ministry of Health and Long-Term Care, the Canadian Institutes of Health Research, the Crohn’s and Colitis Foundation of Canada, the National Institutes of Health, the Wolpow Family Chair in IBD Treatment and Research, the Ontario Ministry of Research and Innovation, and the Leona M. and Harry B. Helmsley Charitable Trust. The authors reported no conflicts of interest.

Pediatric inflammatory bowel disease grew by more than 40% in a 15-year period in Ontario, Canada, according to a retrospective cohort study published in the October issue of Gastroenterology.

Although rates of inflammatory bowel disease (IBD) rose in children and adolescents of all ages, the steepest increase occurred in children with very-early-onset IBD (VEO-IBD), defined as disease diagnosed before they were 10 years old, said Dr. Eric Benchimol at the University of Ottawa and his associates. But these patients also tended to use fewer health services and have fewer surgeries for IBD, compared with older children with the disease, the investigators said (Gastroenterology 2014 October [doi.org/10.1053/j.gastro.2014.06.023]).

Source: American Gastroenterological Association

The findings add to research indicating that VEO-IBD is a distinct form of IBD and indicate the need to assess subgroups of these patients to look at phenotype, genotype, intestinal microbiome, and treatment response, the investigators said.

For the study, researchers created a cohort based on an algorithm of health care visits that identified all children and adolescents in Ontario diagnosed with IBD before age 18 years. The analysis included 7,143 patients with IBD, among whom about 14% had VEO-IBD, the investigators reported.

The overall rate of IBD in children up to 18 years old increased from 9.4 to 13.2 cases per 100,000 population from 1994 through 2009 (P less than .0001), the researchers said. And the yearly increase in VEO-IBD averaged 7.4% – more than three times greater than the 2.2% average annual rise among children diagnosed at 10 years and older, the investigators reported.

But health care utilization trends did not mirror changes in incidence, Dr. Benchimol and associates reported. For example, children diagnosed before they were 6 years old had significantly fewer outpatient visits for IBD, compared with children diagnosed at 10 years and older (odds ratio for girls, 0.67; 95% confidence interval, 0.58-0.78; OR for boys, 0.86; 95% CI, 0.75-0.98). Furthermore, patients diagnosed before age 6 years were less likely to be hospitalized for IBD than were older children with the disease (hazard ratio for girls, 0.70; 95% CI, 0.56-0.87; HR for boys, 1.12; 95% CI, 0.94-1.33), the investigators said.

The likelihood of undergoing intestinal resection also was lower for children diagnosed before age 6 years with Crohn’s disease, compared with older girls (HR, 0.35; 95% CI, 0.16-0.78) and boys (HR, 0.59; 95% CI, 0.34-0.99), said the researchers. And patients diagnosed before age 6 years with ulcerative colitis were less likely to undergo colectomy than were older girls (HR, 0.88; 95% CI, 0.47-1.63) and boys (HR, 0.42; 95% CI, 0.21-0.85). In contrast, rates of IBD-related surgery and hospitalization were similar between children diagnosed at 6-9.9 years of age and those diagnosed at age 10 up to 18 years, the investigators said.

A cohort study from the United States also found a lower likelihood of surgery in children with VEO-IBD, the researchers noted. Large-bowel involvement without ileal disease is prominent in young children with IBD, and these patients might be unlikely to undergo resection because colectomy requires a permanent ostotomy, they added.

The work was supported by the American College of Gastroenterology, the Ontario Ministry of Health and Long-Term Care, the Canadian Institutes of Health Research, the Crohn’s and Colitis Foundation of Canada, the National Institutes of Health, the Wolpow Family Chair in IBD Treatment and Research, the Ontario Ministry of Research and Innovation, and the Leona M. and Harry B. Helmsley Charitable Trust. The authors reported no conflicts of interest.