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Doctors Seek Test for Deploying New Life-Extending Cancer Drugs
New York Times

New drugs that boost the immune system’s ability to fight tumors may be one of the greatest medical advances in years, cancer doctors say, pulling some patients from death’s door and keeping them in remission for years.

But the truth is that this happens for only a minority of patients. Now, doctors say, there is a new imperative to develop a test that will identify in advance which patients will benefit, sparing others the cost and possible side effects.