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Merck Provides Update on Phase 3 Trials KEYNOTE-641 and KEYNOTE-789

*February 2023*

RAHWAY, N.J.–(BUSINESS WIRE)– Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today provided updates on two Phase 3 trials, KEYNOTE-641 and KEYNOTE-789.

Merck also announced that the Phase 3 KEYNOTE-789 trial evaluating KEYTRUDA in combination with pemetrexed plus platinum-based chemotherapy did not meet its dual primary endpoint of OS for the treatment of patients with metastatic nonsquamous non-small cell lung cancer (NSCLC), with epidermal growth factor receptor (EGFR)-genomic tumor mutations, who have previously progressed on a tyrosine kinase inhibitor (TKI), including osimertinib. At the final analysis of the study, there was an improvement in OS for patients who received KEYTRUDA plus pemetrexed with platinum-based chemotherapy compared to pemetrexed with platinum-based chemotherapy; however, these results did not meet statistical significance per the pre-specified statistical plan. At an earlier interim analysis, the trial’s other dual primary endpoint, progression-free survival (PFS) was tested and showed an improvement in the KEYTRUDA arm compared to chemotherapy alone, but these results did not reach statistical significance. Read more.