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Vaccine-Chemotherapy Combo Offers Hope for Brain Cancer Patients

by Bidita Debnath on April 15, 2017 at 11:24 PM
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 Vaccine-Chemotherapy Combo Offers Hope for Brain Cancer Patients

Researchers may have just hit pay dirt with a new combination therapy for a particularly aggressive form of brain cancer-glioblastoma.

The Duke University study found that a vaccine targeting cytomegalovirus (CMV) antigen pp65, combined with high-dose chemotherapy (temozolomide), improved both progression-free survival and overall survival for a small group of glioblastoma (GBM) patients. The cohort of 11 patients who received this combination therapy demonstrated a median progression-free survival of 25.3 months and a median overall survival of 41.1 months, and three patients remain progression-free more than seven years after diagnosis, lead author Kristen Batich explained. "The clinical outcomes in GBM patients who received this combination were very striking," Batich noted.

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"The dose-intensified temozolomide induces a strong state of lymphopenia," continued Batich. "With that comes an opportune moment to introduce an antigen-specific vaccine, which redirects the immune system to put all hands on deck and fight that target." One of the noteworthy results from the study was the excellent response rate despite the high proportion of regulatory T cells, which dampen the immune response and rebounded sharply following TMZ administration. This finding may actually be cause for optimism, Batich noted. "If we could preclude this regulatory T-cell rebound, it could have additionally enhancing effects on the pp65 vaccine response," said Batich.

Though the survival results are quite encouraging, the authors caution that this was a single-arm study without a control group. In addition, the cohort was quite small. Though the outcomes far outpaced historical controls, a more robust trial will be needed to confirm these results. In addition, the team wants to better understand the mechanisms that underlie the strong response rate and refine this combination therapy to produce even better results. "We want to understand why some patients do better than others," said Batich. The study is published in Clinical Cancer Research, a journal of the American Association for Cancer Research.

Source: ANI
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