New Clinical Trial Shows Promise for Life-Extending Mesothelioma Drug

Illustration of cancer cells

Dr. Michele Maio at the University Hospital of Siena in Italy doesn’t need to wait for results of the ongoing, multicenter, worldwide clinical trial involving the latest immunotherapy drug for malignant mesothelioma.

He already is a believer.

Maio and his colleagues in the oncology department recently published results of their smaller, one-center study detailing the effectiveness of tremelimumab, a drug that helps the body’s own immune system to destroy mesothelioma cells without harming healthy ones.

Tremelimumab, which is given intravenously, essentially unmasks the tumor cells and unleashes the immune system to do its work.

“The goal is to improve the percentage of patients who become long-term survivors,” Maio told Asbestos.com. “Tremelimumab moves us in that direction. Our hope is that what we observed in our trial here will be confirmed by this larger study.”

Intensified Treatment Regimen

Maio worked closely with lead researcher Dr. Luana Calabro, M.D., and several others before publishing the findings in Respiratory Medicine. They enrolled 29 previously treated mesothelioma patients between July 30, 2012 and July 15, 2013. The patients were given 10 mg/kg once every four weeks for six months, then every 12 weeks or until disease progression.

Previous studies, which showed less impressive results, included 15 mg/kg every 90 days. The intensified scheduling proved to be just as safe, but elicited a much better response.

More than half of the patients achieved disease control with a median duration of 10 months. All but one of the 29 patients enrolled had pleural mesothelioma, and 21 of all patients had the epithelioid histology. Six were biphasic. The median age was 65.

The median immune-related progression-free survival was 6.2 months and the median overall survival was 11 months. The one-year survival rate was 48.3 percent.

“I think what we’re experiencing right now is a revolution in cancer treatment with new immunotherapy agents,” Maio said. “It’s just a signal of what’s coming. Patients should be encouraged by the advancements being made.”

Immunotherapy Studies Are Expanding

Maio and his peers at the medical oncology and immunotherapy department in Siena were so encouraged by the results they are planning a different study this summer. It will combine tremelimumab with another immunotherapy drug that targets protein agent PD-L1, a different immune system inhibitor.

“It will be the first study for mesothelioma combining the two agents, and it should provide new insight,” Maio said. “We have just scratched the surface of where immunotherapy could take us.”

The larger study of tremelimumab for mesothelioma therapy is slated to finish early in 2016 and is expected to confirm the effectiveness of the drug. It is a randomized, double-blind study that covers 102 locations over 20 countries around the world.

“Our results suggest that tremelimumab might lead to long-lasting disease control in patients with advanced malignant mesothelioma, although this possibility needs to be assessed in a randomized, controlled study,” the authors wrote. “The data also suggests that the efficacy of tremelimumab could be greater in patients with better performance status, irrespective of tumor histology.”

Maio believes that the current standard of care for mesothelioma — surgery, chemotherapy and radiation — may be expanded soon to include immunotherapy agents. Both studies included only patients who already had received chemotherapy.

“This is something that is very promising,” Maio said. “For all of us, it is very exciting.”

  1. Calabro, L., M.D., et al. (2015, March 25). Efficacy and safety of an intensified schedule of tremelimumab for chemotherapy-resistant malignant mesothelioma: an open label, single-arm phase 2 study. Retrieved from http://www.thelancet.com/journals/lanres/article/PIIS2213-2600%2815%2900092-2/fulltext
  2. ClinicalTrials.gov. (2015, January 16). Randomized, Double-blind Study Comparing Tremelimumab to Placebo in Subjects With Unresectable Malignant Mesothelioma. Retrieved from https://clinicaltrials.gov/ct2/show/NCT01843374?term=tremelimumab+and+mesothelioma&rank=1

Tim Povtak is an award-winning writer with more than 30 years of reporting national and international news. His most recent experience is in researching and writing about asbestos litigation issues and asbestos-related conditions like mesothelioma. If you have a story idea for Tim, please email him at tpovtak@asbestos.com

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