On June 29, 2020, the U.S. Food and Drug Administration (FDA) approved pembrolizumab (Keytruda, Merck & Co.) for the first-line treatment of patients with unresectable or metastatic MSI-H or dMMR colorectal cancer (CRC).
MSI-H/dMMR testing is required prior to initiating treatment with Keytruda in these patients. For the MSI-H/dMMR indication, select patients for treatment with Keytruda as a single agent based on MSI-H/dMMR status in tumor specimens. An FDA-approved test for the detection of MSI-H or dMMR is not currently available.
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