Malignant pleural mesothelioma guidelines often are ignored

SAN DIEGO – National guidelines for the treatment of malignant pleural mesothelioma often are not followed, a new study showed, with fewer than one-third of patients receiving cancer-directed surgery.

Another 32% received no treatment, although that didn’t seem to have an impact on median months of survival.

Still, “there can be a wide variation in median survival time, depending on clinical factors and tumor characteristics,” said study coauthor Harmik Soukiasian, MD, of Cedars-Sinai Medical Center, Los Angeles. “Given the variation in prognosis, it is quite astonishing that over 30% of MPM patients are not receiving any form of treatment. As clinicians armed with these data, we need to investigate why that is.”

Dr. Soukiasian presented the study findings at the annual meeting of the American Association for Thoracic Surgery.

MPM, a rare cancer, is mainly linked to asbestos exposure. “MPM is almost always a fatal disease, and the prognosis can only be modestly influenced by oncological treatments,” according to the authors of guidelines released in 2013. “The diagnostic process can be complex, with highly specialized advice frequently required to arrive at a definite diagnosis. Treatment varies from therapeutic nihilism to radical combined-modality treatment approaches” (J Thorac Dis. 2013 Dec;5[6]:E254-E307).

Surgical resection is a controversial treatment for MPM, Dr. Soukiasian said. It is “based on the principle of macroscopic resection of solid tumor with adjuvant therapy to treat micrometastatic disease,” he explained. “Cancer-directed surgery for MPM is usually reserved for localized epithelial type histology and is associated with a 5-year survival rate of 15%.”

For the new study, the investigators tracked 3,834 patients in the National Cancer Database (2004-2014) diagnosed with MPM clinical stages I-III. Most had epithelioid MPM (69%), with sarcomatoid (17%) and mixed subtype (15%) making up the rest. They examined whether patient treatment complied with the National Comprehensive Cancer Network (NCCN) guidelines, which recommend surgery in resectable epithelioid MPM.

 

“Our study revealed significant lack of compliance with NCCN guidelines, as well as many disparities in the management of MPM,” Dr. Soukiasian said. “For the overall cohort, 32.3% of patients did not receive any treatment, 18.1% had surgery plus chemotherapy, 38.6% chemotherapy alone, and only 7% received trimodality therapy. In patients with epithelial histology, surgery was significantly underutilized, with only 30% of patients receiving cancer-directed surgery.”

In addition, he said, “our study reveals several disparities that affect compliance with NCCN guidelines. Treatment disparities were observed in women, octogenarians, the uninsured, the Medicaid-insured, and in patients with comorbidities. Guideline adherence was significantly increased in academic and high-volume hospitals with an associated increase in survival.”

But the study also found that median survival estimates were similar regardless of treatment: 10 months for no treatment, 15 months for chemotherapy only, 17 months for surgery only, and 22 months for surgery plus chemotherapy.

During the AATS presentation, an audience member asked about how performance status – a measure of a person’s ability to perform everyday activities – affects the eligibility for surgery.

 

“It’s quite common for low performance status to exclude someone from surgery,” the audience member said. “Some of these patients are very sick.”

Dr. Soukiasian acknowledged that performance status was not included in the data. The study was focused on the gap between guidelines and real-world practice, and generated questions of why and about the potential opportunity for improved treatment of these patients.

How do patient choices, cost, and quality of life factor in? “These are very important questions and concerns,” Dr. Soukiasian said. “Although our research does not provide data or conclusions on quality of life or cost, these topics will be important to address in follow-up studies to elucidate possible barriers in the treatment of MPM and the initiation of future educational opportunities for our patients.”

No disclosures and no study funding were reported.
 

SOURCE: Espinoza-Mercado F et al. General Thoracic Surgery Simultaneous Scientific Session. Abstract 18.

SAN DIEGO – National guidelines for the treatment of malignant pleural mesothelioma often are not followed, a new study showed, with fewer than one-third of patients receiving cancer-directed surgery.

Another 32% received no treatment, although that didn’t seem to have an impact on median months of survival.

Still, “there can be a wide variation in median survival time, depending on clinical factors and tumor characteristics,” said study coauthor Harmik Soukiasian, MD, of Cedars-Sinai Medical Center, Los Angeles. “Given the variation in prognosis, it is quite astonishing that over 30% of MPM patients are not receiving any form of treatment. As clinicians armed with these data, we need to investigate why that is.”

Dr. Soukiasian presented the study findings at the annual meeting of the American Association for Thoracic Surgery.

MPM, a rare cancer, is mainly linked to asbestos exposure. “MPM is almost always a fatal disease, and the prognosis can only be modestly influenced by oncological treatments,” according to the authors of guidelines released in 2013. “The diagnostic process can be complex, with highly specialized advice frequently required to arrive at a definite diagnosis. Treatment varies from therapeutic nihilism to radical combined-modality treatment approaches” (J Thorac Dis. 2013 Dec;5[6]:E254-E307).

Surgical resection is a controversial treatment for MPM, Dr. Soukiasian said. It is “based on the principle of macroscopic resection of solid tumor with adjuvant therapy to treat micrometastatic disease,” he explained. “Cancer-directed surgery for MPM is usually reserved for localized epithelial type histology and is associated with a 5-year survival rate of 15%.”

For the new study, the investigators tracked 3,834 patients in the National Cancer Database (2004-2014) diagnosed with MPM clinical stages I-III. Most had epithelioid MPM (69%), with sarcomatoid (17%) and mixed subtype (15%) making up the rest. They examined whether patient treatment complied with the National Comprehensive Cancer Network (NCCN) guidelines, which recommend surgery in resectable epithelioid MPM.

 

“Our study revealed significant lack of compliance with NCCN guidelines, as well as many disparities in the management of MPM,” Dr. Soukiasian said. “For the overall cohort, 32.3% of patients did not receive any treatment, 18.1% had surgery plus chemotherapy, 38.6% chemotherapy alone, and only 7% received trimodality therapy. In patients with epithelial histology, surgery was significantly underutilized, with only 30% of patients receiving cancer-directed surgery.”

In addition, he said, “our study reveals several disparities that affect compliance with NCCN guidelines. Treatment disparities were observed in women, octogenarians, the uninsured, the Medicaid-insured, and in patients with comorbidities. Guideline adherence was significantly increased in academic and high-volume hospitals with an associated increase in survival.”

But the study also found that median survival estimates were similar regardless of treatment: 10 months for no treatment, 15 months for chemotherapy only, 17 months for surgery only, and 22 months for surgery plus chemotherapy.

During the AATS presentation, an audience member asked about how performance status – a measure of a person’s ability to perform everyday activities – affects the eligibility for surgery.

 

“It’s quite common for low performance status to exclude someone from surgery,” the audience member said. “Some of these patients are very sick.”

Dr. Soukiasian acknowledged that performance status was not included in the data. The study was focused on the gap between guidelines and real-world practice, and generated questions of why and about the potential opportunity for improved treatment of these patients.

How do patient choices, cost, and quality of life factor in? “These are very important questions and concerns,” Dr. Soukiasian said. “Although our research does not provide data or conclusions on quality of life or cost, these topics will be important to address in follow-up studies to elucidate possible barriers in the treatment of MPM and the initiation of future educational opportunities for our patients.”

No disclosures and no study funding were reported.
 

SOURCE: Espinoza-Mercado F et al. General Thoracic Surgery Simultaneous Scientific Session. Abstract 18.

SAN DIEGO – National guidelines for the treatment of malignant pleural mesothelioma often are not followed, a new study showed, with fewer than one-third of patients receiving cancer-directed surgery.

Another 32% received no treatment, although that didn’t seem to have an impact on median months of survival.

Still, “there can be a wide variation in median survival time, depending on clinical factors and tumor characteristics,” said study coauthor Harmik Soukiasian, MD, of Cedars-Sinai Medical Center, Los Angeles. “Given the variation in prognosis, it is quite astonishing that over 30% of MPM patients are not receiving any form of treatment. As clinicians armed with these data, we need to investigate why that is.”

Dr. Soukiasian presented the study findings at the annual meeting of the American Association for Thoracic Surgery.

MPM, a rare cancer, is mainly linked to asbestos exposure. “MPM is almost always a fatal disease, and the prognosis can only be modestly influenced by oncological treatments,” according to the authors of guidelines released in 2013. “The diagnostic process can be complex, with highly specialized advice frequently required to arrive at a definite diagnosis. Treatment varies from therapeutic nihilism to radical combined-modality treatment approaches” (J Thorac Dis. 2013 Dec;5[6]:E254-E307).

Surgical resection is a controversial treatment for MPM, Dr. Soukiasian said. It is “based on the principle of macroscopic resection of solid tumor with adjuvant therapy to treat micrometastatic disease,” he explained. “Cancer-directed surgery for MPM is usually reserved for localized epithelial type histology and is associated with a 5-year survival rate of 15%.”

For the new study, the investigators tracked 3,834 patients in the National Cancer Database (2004-2014) diagnosed with MPM clinical stages I-III. Most had epithelioid MPM (69%), with sarcomatoid (17%) and mixed subtype (15%) making up the rest. They examined whether patient treatment complied with the National Comprehensive Cancer Network (NCCN) guidelines, which recommend surgery in resectable epithelioid MPM.

 

“Our study revealed significant lack of compliance with NCCN guidelines, as well as many disparities in the management of MPM,” Dr. Soukiasian said. “For the overall cohort, 32.3% of patients did not receive any treatment, 18.1% had surgery plus chemotherapy, 38.6% chemotherapy alone, and only 7% received trimodality therapy. In patients with epithelial histology, surgery was significantly underutilized, with only 30% of patients receiving cancer-directed surgery.”

In addition, he said, “our study reveals several disparities that affect compliance with NCCN guidelines. Treatment disparities were observed in women, octogenarians, the uninsured, the Medicaid-insured, and in patients with comorbidities. Guideline adherence was significantly increased in academic and high-volume hospitals with an associated increase in survival.”

But the study also found that median survival estimates were similar regardless of treatment: 10 months for no treatment, 15 months for chemotherapy only, 17 months for surgery only, and 22 months for surgery plus chemotherapy.

During the AATS presentation, an audience member asked about how performance status – a measure of a person’s ability to perform everyday activities – affects the eligibility for surgery.

 

“It’s quite common for low performance status to exclude someone from surgery,” the audience member said. “Some of these patients are very sick.”

Dr. Soukiasian acknowledged that performance status was not included in the data. The study was focused on the gap between guidelines and real-world practice, and generated questions of why and about the potential opportunity for improved treatment of these patients.

How do patient choices, cost, and quality of life factor in? “These are very important questions and concerns,” Dr. Soukiasian said. “Although our research does not provide data or conclusions on quality of life or cost, these topics will be important to address in follow-up studies to elucidate possible barriers in the treatment of MPM and the initiation of future educational opportunities for our patients.”

No disclosures and no study funding were reported.
 

SOURCE: Espinoza-Mercado F et al. General Thoracic Surgery Simultaneous Scientific Session. Abstract 18.