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Dr. Jack West is a medical oncologist and thoracic oncology specialist who is the Founder and previously served as President & CEO, currently a member of the Board of Directors of the Global Resource for Advancing Cancer Education (GRACE)

 

Chemotherapy for Mesothelioma
Author
Howard (Jack) West, MD

For many years, patients with malignant pleural mesothelioma (MPM) were often not offered treatment. Surgery was offered to rare, selected patients who tended to be much younger and more fit than a typical patient with MPM, but we'll talk about surgery later. Chemotherapy was only very inconsistently offered to the vast majority of unresectable patients with MPM, because it was not felt to clearly be beneficial. This is pretty similar to the view of advanced NSCLC until the mid- to late-1990s. Fortunately, studies over the past several years have clarified that chemotherapy can improve survival for MPM.

Up until Alimta was approved, the regimen that was most commonly used for MPM was cisplatin and gemcitabine. This combination was reported in a trial of 21 patients with advanced MPM (abstract here) to produce an objective response rate of 48%, median response duration of about 6 months, and a median survival of about 9 month -- not amazing, particularly in overall survival, but the best we had. In fact, several later trials suggested lower response rates and not as impressive results overall, but we used it because we wanted to help and patients needed treatment, and there had never been any reasonably large trials undertaken for MPM, so we really didn't have any good evidence for or against the value of treatment. That changed when a large study evalauted the utility of cisplatin and alimta together.

At ASCO 2007, Nick Vogelzang and colleagues presented a plenary session abstract on mesothelioma (here) that was subsequently published as a full publication in 2003 (abstract here). The first major MPM trial ever, it enrolled 456 patients from 114 sites in 19 different countries. It had a straightforward design, randomizing patients to the likely minimally active cisplatin alone in one arm, and cisplatin/alimta in the other arm:

Vogelzang MPM schema slide (Click to enlarge)

It was a plenary session presentation because the combination of cisplatin and alimta led to a significantly higher response rate (41% vs. 17%, p < 0.001), but also a significantly higher median survival by 3 months (12.1 vs 9.3 months, p < 0.02), as well as a nearly two month difference in median time to progression (5.7 vs. 3.9 mo, p < 0.001). The differences are shown here, with pretty striking differences (gaps) on the survival curves:

Vogelzang efficacy

Impressive enough, but additional work (abstract here) also demonstrated that patients on the cis/alimta combination had significantly improved quality of life measures in terms of BOTH chest-related symptoms (chest pain, shortness of breath, and cough), and general (fatigue, loss of appetite, and activity level - the last not quite reaching statistical significance):

chest symptoms cis/alimta general QoL cis/alimta

And so, based on this work, the US FDA approved Alimta for the first time as a treatment for MPM. Later that year, Alimta was also approved for lung cancer, but this represented a particularly big step in MPM, showing that this disease could be studied effectively and that treatments could offer significant benefits for patients with this too often ignored disease. And at this time, cisplatin alimta, or sometimes carboplatin substitution for cisplatin, are the leading treatment options for MPM.

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