New Yale Research Reveals Why Immunotherapy Doesn’t Work for Everybody


Cancer Immunity Illustration

The new research focused on the failure of a process known as “mismatch repair.”

A Yale University study presents a new explanation for why immunotherapy only works for some cancer patients. 

Immunotherapy, a biotherapy that improves the immune system’s ability to recognize and fight mutant tumor cells, has changed the treatment landscape for patients suffering from cancer, which is caused by the progressive accumulation of Yale School of Medicine researchers recently published in the journal Cancer Discovery has uncovered a possible explanation for why this occurs. According to an analysis of a phase 2 study involving 24 patients with endometrial cancer and the immunotherapy drug pembrolizumab, the Yale team pinpoints a specific mechanism of faulty DNA repair in tumors as a key factor in determining patient outcomes.

“We wanted to understand why some patients respond better than others to immunotherapy,” said co-corresponding author Ryan Chow, an M.D./Ph.D. candidate working in Yale’s Department of Genetics and the Systems Biology Institute.

The Yale team’s research concentrated on the failure of a process known as “mismatch repair.”  When cells divide, errors in their DNA often arise. A special group of proteins identifies and corrects DNA errors through mismatch repair. However, a breakdown in this editing process occurs in many different types of cancer, resulting in high mutation levels.

The research team — led by Chow, Dr. Eric Song, an ophthalmology resident and former M.D./Ph.D. student at Yale, and Dr. Alessandro Santin, a professor of obstetrics, gynecology, and reproductive sciences — zeroed in on the fact that mismatch repair deficiency can result from two distinct mechanisms. In one, mutations occur in the DNA repair machinery itself, leading to the production of defective repair proteins; in the second, production of the DNA repair machinery is halted entirely. In both cases, the tumors accumulate very high levels of mutations that would be expected to make them good candidates for immunotherapy.

“An analogy would be a dysfunctional toy factory,” Chow said. “Maybe the factory makes broken toys that don’t work, or the factory has no personnel and stops producing toys altogether. Either way, kids won’t be happy.”

However, the researchers found that tumors with…



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