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New Drug May Help Immune System Fight Cancer
Date:5/16/2013

By Brenda Goodman
HealthDay Reporter

THURSDAY, May 16 (HealthDay News) -- An experimental drug that taps the power of the body's immune system to fight cancer is shrinking tumors in patients for whom other treatments have failed, an early study shows.

The drug binds to a protein called PD-L1 that sits on the surface of cancer cells and makes them invisible to the immune system, almost like a cloaking device.

"That [the protein] allows the tumor cell to grow unchecked and cause harm to the patient," said study author Dr. Roy Herbst, chief of medical oncology at Yale University.

But with the protein blocked, the immune system can see and destroy cancer cells.

Of 140 patients in the pilot safety study, 29 (or 21 percent) initially saw significant tumor shrinkage after at least three months on the medication. Researchers say 26 patients have continued to respond over time, including some who have been on the drug for more than a year. One patient saw tumors disappear completely.

The drug also seems to work on a wide range of cancers, including some of the toughest to treat, including non-small cell lung cancer, melanoma skin cancer, colorectal cancer, kidney cancer and stomach cancer.

"This has all the characteristics of a really amazing drug," said Herbst, who has been testing new cancer medications for two decades. "I can count on one hand the number of times I've seen response rates like this."

The study was funded by Genentech/Roche, the company that is developing the drug. The results were presented at a Wednesday news conference organized by the American Society of Clinical Oncology in advance of its annual meeting, which starts May 31 in Chicago.

Study results presented at medical meetings are considered preliminary because they have not been subjected to the rigorous scrutiny required for publication in a medical journal.

At least four other companies -- Merck, Bristol-Mey
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