According to the results of a large, global study led by Yale Cancer Center researchers, even a tiny amount of a biomarker known as PD-L1 (programmed death-ligand1) can predict a long-term survival benefit from using pembrolizumab (Keytruda). The drug is one of the first checkpoint inhibitors to be developed and used in cancer treatment. The findings are published online today in the Journal of Clinical Oncology.
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