Merck Hits Brakes on Lynparza in Colorectal Cancer

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Merck says it is stopping for futility its Phase 3 LYNK-003 trial investigating Lynparza (olaparib) with or without bevacizumab for treating patients with unresectable or metastatic colorectal cancer who have not progressed following first-line induction. The stoppage was recommended by an independent data monitoring committee after they reviewed the data from a planned interim analysis.

“At the pre-specified interim analysis for progression-free survival, the efficacy of Lynparza as a monotherapy and in combination with bevacizumab relative to control met the criteria for futility by the DMC and accordingly, both experimental arms will be discontinued,” Merck says. “No new safety signals were observed with Lynparza in this trial, and the safety profiles of both Lynparza monotherapy and Lynparza combined with bevacizumab in this trial were generally consistent with that observed in previously reported studies.”

Lynparza is a PARP inhibitor being co-developed and co-commercialized with AstraZeneca. It is designed to potentially exploit DNA damage response (DDR) pathway deficiencies, such as BRCA mutations, to kill cancer cells. “Inhibition of PARP with Lynparza leads to the trapping of PARP bound to DNA single-strand breaks, stalling of replication forks, their collapse and the generation of DNA double-strand breaks and cancer cell death,” the company explains. The therapy is currently being tested in various tumor types with defects and dependencies in the DDR.

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