Favorable Data on Keytruda in Lung Cancer

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Merck says new data from the pivotal Phase 3 KEYNOTE-091 trial found that adjuvant treatment with Keytruda significantly improved disease-free survival (DFS), one of the dual primary endpoints, reducing the risk of disease recurrence or death by 24% compared to placebo in patients with stage IB to IIIA non-small cell lung cancer following surgical resection regardless of PD-L1 expression. Median DFS was 53.6 months for Keytruda versus 42.0 months for placebo.

The other dual endpoint, an improvement in DFS for patients whose tumors express PD-L1, did not reach statistical significance under the pre-specified statistical plan, the company says.  “Among these patients, median DFS was not reached in either arm,” it says. “Additionally, a favorable trend in overall survival (OS), a key secondary endpoint, was observed for Keytruda versus placebo regardless of PD-L1 expression.” Merck also notes that the OS data are not mature and did not reach statistical significance at the time of the current interim analysis. The trial will continue to assess DFS in patients whose tumors express high levels of PD-L1 and OS, Merck says.

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