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Mesothelioma ‘Triple Treatment’ May Jump Start Killer Cells

ByAlex Strauss

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New mesothelioma research from Harvard University suggests that if one type of immunotherapy is effective against mesothelioma, three types might be even more effective.

Immunotherapy involves manipulating the immune system to fight disease. Some types of cancer, including mesothelioma, take hold in the body in part by ‘shutting down’ the natural immunotoxins, or cell killers, that would normally attack them. Now, scientists are working with a number of molecules designed to jump start the immune system and help it recognize, target, and even ‘remember’ invading mesothelioma cancer cells.

Using a mouse model of mesothelioma, the Harvard researchers investigated the roles of three factors effecting immunity: regulatory T-cells, intratumoural transforming growth factor (TGF)-â and cytotoxic T lymphocyte-associated antigen-4 (CTLA4). The researchers then treated the mesothelioma with a combination of monoclonal antibodies and a TGF-â soluble receptor, specifically designed to target these three immune system factors.

With this ‘triple treatment’, the team reports, not only did the tumors clear up long term, but the cancer-killing immune cells appeared to retain a memory of the mesothelioma tumor cells that would prepare them to ward off future invasion.

“It was found that treatments targeting a single negative regulator molecule mechanism were not as effective against tumors as targeting multiple mechanisms simultaneously,” writes lead investigator Dr. Haydn Kissick in a summary of the findings for Immunology and Cell Biology. The report goes on to suggest that clinical application of immunotherapies against mesothelioma “may be improved by simultaneously targeting multiple mechanisms of immune suppression”.

Mesothelioma, a cancer linked to asbestos exposure, is highly resistant to conventional treatments. Immunotherapy is being studied both as a stand-alone treatment and as an adjunct treatment along with other types of therapies. Another recent study of the regulatory T-cells, for example, suggests that their manipulation may be a way to improve the effectiveness of chemotherapy for mesothelioma.

Sources:

Kissick, HT et al, “Tumour eradication and induction of memory against murine mesotehelioma by combined immunotherapy”, February 21, 2012, Immunology and Cell Biology, Epub ahead of print. Ireland, DJ, “The Role of Regulatory T Cells in Mesothelioma”, February 1, 2012, Cancer Microenvironments, Epub ahead of print.

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