That conclusion comes from a group of Japanese researchers who performed a retrospective review of 59 consecutive pleural mesothelioma patients who had multimodal mesothelioma treatment that included extrapleural pneumonectomy (EPP) surgery.
Study subjects had been treated for malignant mesothelioma at Hyogo College of Medicine between July 2004 and August 2013. Patients received mesothelioma chemotherapy prior to surgery and some also received radiation therapy afterward.
Second-Line Treatment and Mesothelioma Survival
There is no universally-accepted second-line therapy for people whose malignant mesothelioma comes back after first-line treatment. Numerous studies have been conducted in an effort to find the most effective way to re-treat these relapsed patients.
In the new Japanese study, 39 of the 59 mesothelioma patients eventually relapsed after their EPP surgery. The median time to relapse was a little less than a year. Of the patients who relapsed, 27 had undergone just one other treatment modality in addition to surgery while 12 had undergone all three types of treatment.
Chemotherapy After Surgery
In many cases, mesothelioma patients who relapse after aggressive treatment are told that they have no other treatment options and are recommended for palliative care and/or hospice.
That was the situation in 12 of the cases that were reviewed for the new study. Six other patients started chemotherapy after surgery but discontinued it. The remaining 21 (53%) mesothelioma patients completed more than three cycles of systemic chemotherapy. These are the patients who had the best survival results.
“The median survival time after EPP was significantly longer in 21 patients who received additional chemotherapy than in 18 patients who did not,” says Dr. Teruhisa Takuwa with the Department of Thoracic Surgery at Hyogo College of Medicine.
According to the report published in the International Journal of Clinical Oncology, the mesothelioma patients who stuck with the additional chemotherapy had a median survival of 39.2 months after their EPP surgery. In contrast, the 18 patients who did not complete the additional treatment had a median survival of just 12.2 months.
The researchers conclude that there is clearly a survival benefit to undergoing additional chemotherapy after EPP if mesothelioma recurs.
Approximately 2,500 people are diagnosed with mesothelioma in the US each year, usually as a result of asbestos exposure. Most are treated with a combination of therapies including chemotherapy with pemetrexed (Alimta) and cisplatin.
Patients with good overall health may be recommended for either EPP surgery, during which a lung is removed, or lung-sparing pleurectomy/decortication (P/D). Mesothelioma experts remain divided over which surgical approach is preferable since EPP carries a higher rate of complications and death, but may offer a better chance at longer survival.
Takuwa, T, et al, Post-recurrence chemotherapy for mesothelioma patients undergoing extrapleural pneumonectomy”, April 24, 2017, International Journal of Clinical Oncology, Epub ahead of print