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MADRID – Two randomized phase 2b trials show the combination of ceftazidime-avibactam (CAZ-AVI) is safe and effective in children with complicated intra-abdominal infections or complicated urinary tract infections (UTIs).
The combination already is approved for these conditions in adults, said John Bradley, MD, who presented the studies at the European Society of Clinical Microbiology and Infectious Diseases annual congress.
However, Pfizer, which recently acquired the drug combination from AstraZeneca as part of its small-molecule anti-infectives sell-off, intends to go for a pediatric approval for these two indications. The studies, which had secondary efficacy endpoints, will be used as part of the application package to the Food and Drug Administration and the European Medicines Agency, said Dr. Bradley, professor of clinical pediatrics at the University of California, San Diego.
“For those of you who take care of adults and use these drugs, this seems like old news, but those of us who take care of children can rejoice, because these are the first pediatric data presented. And – no surprise – the combination appears to be as safe and effective in children as it is in adults.”
Both studies concluded in late 2017. “We have the data locked and it’s being cleaned and soon will be submitted to regulatory agencies,” Dr. Bradley said. “However, we do not yet have approval so if you do use it, it will still be considered an off-label use until regulatory agencies work with the sponsor to achieve approval.”
Both studies were international, conducted in the United States, Europe, Russia, South Korea, Taiwan, and Turkey.
The first study included 83 children, mean age 10 years, who had complicated intra-abdominal infections precipitated by ruptured appendicitis. About 90% already had been treated with other antibiotics. In this trial, the CAZ-AVI combination was augmented with metronidazole, and compared to meropenem, in 72-hour infusions. The microbiologic test of cure was conducted at 8-15 days with a late follow-up at 20-36 days after the last infusion.
Most of the patents (83%) had an infective organism identified; it was most often Escherichia coli or Pseudomonas aeruginosa. All pathogens were susceptible to the study drugs.
Five children in the combination group experienced a serious adverse event. These included one case each of ileus, intestinal obstruction, large intestine perforation, renal colic, and urethra meatus stenosis. There was one case of ileus in the meropenem group.
There was one case of diarrhea in the combination group. There were three allergic reactions in each group (cough, pruritus, and rash). The meropenem group also had two cases of anemia.
At the test-of-cure point, clinical response was similar in the combination and meropenem groups, both in clinical evidence (93% vs. 95%) and microbiological response (90% vs. 95%) At last follow-up, 100% of each group was clinically cured. The microbiological cure rates were 90% and 95%, respectively.
Success for complicated UTI
The complicated UTI study was likewise good news for CAZ-AVI, this time without metronidazole. This study included 95 children, mean age 6 years, in the same globally gathered cohorts. All of the children were hospitalized; they were randomized to CAZ-AVI at age-specific doses or cefepime, less than 2,000 mg/infusion for 72 hours. The test of cure was conducted at 8-15 days with a late follow-up at 20-36 days after the last infusion.
Most patients (83%) had acute pyelonephritis. About a quarter had at least one complicating factor, including obstructive uropathies due to functional or anatomic abnormalities of the urogenital tract, recurrent UTI, vesicoureteral reflex, or intermittent catheterization. About 20% of the group had a urological abnormality and 40% had been on a systemic antibiotic in the 2 weeks before study entry.
The most common infective organism was E. coli, (92%) followed by Klebsiella pneumoniae, Proteus mirabilis, and Enterobacter cloacae.
Again, about half of each group had at least one adverse event. Serious adverse events occurred in 12% of the combination group and 7% of the cefepime group. Three patients taking the combination discontinued because of the reaction.
There were eight serious events in the combination group, including abdominal pain, constipation, cystitis, acute pyelonephritis, UTI (not considered related to the study drug) viral infection, nervous system disorder, and nephrolithiasis. There were two serious adverse events in the cefepime group (cystitis and acute pyelonephritis).
Favorable clinical outcomes occurred in 89% of the combination group and 82.6% of the cefepime group. A microbiological cure was evident in 79.6% and 60.9%, respectively.
The combination was more effective than was cefepime at eradicating E. coli (79.6% vs. 59.1%), although no statistical analysis was presented. The other, less-frequent pathogens did not co-occur in both groups, so comparisons were not made. However, the combination eradicated P. mirabilis in both patients who had it, and 50% of K. pneumoniae infections.
A sustained clinical cure occurred in 81% of the combination group and 82.6% of the cefepime group.
Dr. Bradley said the University of California, San Diego, received fees from both Pfizer or AstraZeneca relating to the studies.
SOURCE: Bradley J et al. ECCMID 2018 oral abstracts O1123 and O1124.
MADRID – Two randomized phase 2b trials show the combination of ceftazidime-avibactam (CAZ-AVI) is safe and effective in children with complicated intra-abdominal infections or complicated urinary tract infections (UTIs).
The combination already is approved for these conditions in adults, said John Bradley, MD, who presented the studies at the European Society of Clinical Microbiology and Infectious Diseases annual congress.
However, Pfizer, which recently acquired the drug combination from AstraZeneca as part of its small-molecule anti-infectives sell-off, intends to go for a pediatric approval for these two indications. The studies, which had secondary efficacy endpoints, will be used as part of the application package to the Food and Drug Administration and the European Medicines Agency, said Dr. Bradley, professor of clinical pediatrics at the University of California, San Diego.
“For those of you who take care of adults and use these drugs, this seems like old news, but those of us who take care of children can rejoice, because these are the first pediatric data presented. And – no surprise – the combination appears to be as safe and effective in children as it is in adults.”
Both studies concluded in late 2017. “We have the data locked and it’s being cleaned and soon will be submitted to regulatory agencies,” Dr. Bradley said. “However, we do not yet have approval so if you do use it, it will still be considered an off-label use until regulatory agencies work with the sponsor to achieve approval.”
Both studies were international, conducted in the United States, Europe, Russia, South Korea, Taiwan, and Turkey.
The first study included 83 children, mean age 10 years, who had complicated intra-abdominal infections precipitated by ruptured appendicitis. About 90% already had been treated with other antibiotics. In this trial, the CAZ-AVI combination was augmented with metronidazole, and compared to meropenem, in 72-hour infusions. The microbiologic test of cure was conducted at 8-15 days with a late follow-up at 20-36 days after the last infusion.
Most of the patents (83%) had an infective organism identified; it was most often Escherichia coli or Pseudomonas aeruginosa. All pathogens were susceptible to the study drugs.
Five children in the combination group experienced a serious adverse event. These included one case each of ileus, intestinal obstruction, large intestine perforation, renal colic, and urethra meatus stenosis. There was one case of ileus in the meropenem group.
There was one case of diarrhea in the combination group. There were three allergic reactions in each group (cough, pruritus, and rash). The meropenem group also had two cases of anemia.
At the test-of-cure point, clinical response was similar in the combination and meropenem groups, both in clinical evidence (93% vs. 95%) and microbiological response (90% vs. 95%) At last follow-up, 100% of each group was clinically cured. The microbiological cure rates were 90% and 95%, respectively.
Success for complicated UTI
The complicated UTI study was likewise good news for CAZ-AVI, this time without metronidazole. This study included 95 children, mean age 6 years, in the same globally gathered cohorts. All of the children were hospitalized; they were randomized to CAZ-AVI at age-specific doses or cefepime, less than 2,000 mg/infusion for 72 hours. The test of cure was conducted at 8-15 days with a late follow-up at 20-36 days after the last infusion.
Most patients (83%) had acute pyelonephritis. About a quarter had at least one complicating factor, including obstructive uropathies due to functional or anatomic abnormalities of the urogenital tract, recurrent UTI, vesicoureteral reflex, or intermittent catheterization. About 20% of the group had a urological abnormality and 40% had been on a systemic antibiotic in the 2 weeks before study entry.
The most common infective organism was E. coli, (92%) followed by Klebsiella pneumoniae, Proteus mirabilis, and Enterobacter cloacae.
Again, about half of each group had at least one adverse event. Serious adverse events occurred in 12% of the combination group and 7% of the cefepime group. Three patients taking the combination discontinued because of the reaction.
There were eight serious events in the combination group, including abdominal pain, constipation, cystitis, acute pyelonephritis, UTI (not considered related to the study drug) viral infection, nervous system disorder, and nephrolithiasis. There were two serious adverse events in the cefepime group (cystitis and acute pyelonephritis).
Favorable clinical outcomes occurred in 89% of the combination group and 82.6% of the cefepime group. A microbiological cure was evident in 79.6% and 60.9%, respectively.
The combination was more effective than was cefepime at eradicating E. coli (79.6% vs. 59.1%), although no statistical analysis was presented. The other, less-frequent pathogens did not co-occur in both groups, so comparisons were not made. However, the combination eradicated P. mirabilis in both patients who had it, and 50% of K. pneumoniae infections.
A sustained clinical cure occurred in 81% of the combination group and 82.6% of the cefepime group.
Dr. Bradley said the University of California, San Diego, received fees from both Pfizer or AstraZeneca relating to the studies.
SOURCE: Bradley J et al. ECCMID 2018 oral abstracts O1123 and O1124.
MADRID – Two randomized phase 2b trials show the combination of ceftazidime-avibactam (CAZ-AVI) is safe and effective in children with complicated intra-abdominal infections or complicated urinary tract infections (UTIs).
The combination already is approved for these conditions in adults, said John Bradley, MD, who presented the studies at the European Society of Clinical Microbiology and Infectious Diseases annual congress.
However, Pfizer, which recently acquired the drug combination from AstraZeneca as part of its small-molecule anti-infectives sell-off, intends to go for a pediatric approval for these two indications. The studies, which had secondary efficacy endpoints, will be used as part of the application package to the Food and Drug Administration and the European Medicines Agency, said Dr. Bradley, professor of clinical pediatrics at the University of California, San Diego.
“For those of you who take care of adults and use these drugs, this seems like old news, but those of us who take care of children can rejoice, because these are the first pediatric data presented. And – no surprise – the combination appears to be as safe and effective in children as it is in adults.”
Both studies concluded in late 2017. “We have the data locked and it’s being cleaned and soon will be submitted to regulatory agencies,” Dr. Bradley said. “However, we do not yet have approval so if you do use it, it will still be considered an off-label use until regulatory agencies work with the sponsor to achieve approval.”
Both studies were international, conducted in the United States, Europe, Russia, South Korea, Taiwan, and Turkey.
The first study included 83 children, mean age 10 years, who had complicated intra-abdominal infections precipitated by ruptured appendicitis. About 90% already had been treated with other antibiotics. In this trial, the CAZ-AVI combination was augmented with metronidazole, and compared to meropenem, in 72-hour infusions. The microbiologic test of cure was conducted at 8-15 days with a late follow-up at 20-36 days after the last infusion.
Most of the patents (83%) had an infective organism identified; it was most often Escherichia coli or Pseudomonas aeruginosa. All pathogens were susceptible to the study drugs.
Five children in the combination group experienced a serious adverse event. These included one case each of ileus, intestinal obstruction, large intestine perforation, renal colic, and urethra meatus stenosis. There was one case of ileus in the meropenem group.
There was one case of diarrhea in the combination group. There were three allergic reactions in each group (cough, pruritus, and rash). The meropenem group also had two cases of anemia.
At the test-of-cure point, clinical response was similar in the combination and meropenem groups, both in clinical evidence (93% vs. 95%) and microbiological response (90% vs. 95%) At last follow-up, 100% of each group was clinically cured. The microbiological cure rates were 90% and 95%, respectively.
Success for complicated UTI
The complicated UTI study was likewise good news for CAZ-AVI, this time without metronidazole. This study included 95 children, mean age 6 years, in the same globally gathered cohorts. All of the children were hospitalized; they were randomized to CAZ-AVI at age-specific doses or cefepime, less than 2,000 mg/infusion for 72 hours. The test of cure was conducted at 8-15 days with a late follow-up at 20-36 days after the last infusion.
Most patients (83%) had acute pyelonephritis. About a quarter had at least one complicating factor, including obstructive uropathies due to functional or anatomic abnormalities of the urogenital tract, recurrent UTI, vesicoureteral reflex, or intermittent catheterization. About 20% of the group had a urological abnormality and 40% had been on a systemic antibiotic in the 2 weeks before study entry.
The most common infective organism was E. coli, (92%) followed by Klebsiella pneumoniae, Proteus mirabilis, and Enterobacter cloacae.
Again, about half of each group had at least one adverse event. Serious adverse events occurred in 12% of the combination group and 7% of the cefepime group. Three patients taking the combination discontinued because of the reaction.
There were eight serious events in the combination group, including abdominal pain, constipation, cystitis, acute pyelonephritis, UTI (not considered related to the study drug) viral infection, nervous system disorder, and nephrolithiasis. There were two serious adverse events in the cefepime group (cystitis and acute pyelonephritis).
Favorable clinical outcomes occurred in 89% of the combination group and 82.6% of the cefepime group. A microbiological cure was evident in 79.6% and 60.9%, respectively.
The combination was more effective than was cefepime at eradicating E. coli (79.6% vs. 59.1%), although no statistical analysis was presented. The other, less-frequent pathogens did not co-occur in both groups, so comparisons were not made. However, the combination eradicated P. mirabilis in both patients who had it, and 50% of K. pneumoniae infections.
A sustained clinical cure occurred in 81% of the combination group and 82.6% of the cefepime group.
Dr. Bradley said the University of California, San Diego, received fees from both Pfizer or AstraZeneca relating to the studies.
SOURCE: Bradley J et al. ECCMID 2018 oral abstracts O1123 and O1124.
REPORTING FROM ECCMID 2018
Key clinical point: The CAZ-AVI combination was as good as the standard comparator drug in both studies.
Major finding: The combination cured close to 90% of infections in both studies.
Study details: Together, the phase 2b studies comprised 178 children.
Disclosures: Pfizer sponsored the studies.
Source: Bradley J et al. ECCMID 2018 oral abstracts O1123 and O1124.