“The researchers started with a group of 103 people. The trial participants were among the 2 to 3 percent of cancer patients with tumors that should respond to immunotherapy, a drug that overcomes barriers that prevent the immune system from attacking cancers.

But in clinical trials, immunotherapy is not supposed to replace the standard treatments. The researchers, led by Dr. Luis A. Diaz Jr. and Dr. Andrea Cercek, decided to give dostarlimab, an immunotherapy drug, on its own.

The result was stunning, and could bring hope to the limited cohort of patients contending with these cancers.

In 49 of the patients, who had rectal cancer, the tumors disappeared and, after five years, have not recurred. Cancers also vanished for 35 of 54 patients who had other cancers, including in the stomach, esophagus, liver, endometrium, urinary tract and prostate.

Out of all 103 patients, cancers recurred in only five. Three got additional doses of immunotherapy and one, whose tumor recurred in a lymph node, had the lymph node removed. Those four patients so far have no evidence of disease. The fifth patient had additional immunotherapy that made the tumor shrink.

The investigators reported their results Sunday at the annual meeting of the American Association for Cancer Research and in a paper published in The New England Journal of Medicine.”

From New York Times.