Merck Reports Favorable Lung Cancer Drug Data

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Merck is reporting favorable results from the IDeate-Lung01 Phase 2 trial showing that ifinatamab deruxtecan (I-DXd) demonstrated clinically meaningful response rates in patients with previously treated extensive-stage small cell lung cancer (ES-SCLC). The potential first-in-class B7-H3 directed DXd antibody drug conjugate is being jointly developed with Daiichi Sankyo, the company says.

The data show a confirmed objective response rate (ORR) of 48.2% was observed with tifinatamab deruxtecan in 137 patients with previously treated ES-SCLC, Merck says. “Three complete responses (CRs), 63 partial responses (PRs) and 54 cases of stable disease (SD) were also seen,” it says. “Median progression-free survival (PFS) was 4.9 months (95% CI: 4.2–5.5) and median overall survival (OS) was 10.3 months (95% CI: 9.1–13.3).  Disease progression and time-to-event results support further randomized, controlled assessment.”

“Patients with extensive-stage small cell lung cancer have an extremely poor prognosis despite current standard of care treatment options,” a Merck release says. “The impressive response rates observed in IDeate-Lung01 provide further evidence of the potential role that ifinatamab deruxtecan could play in treating this aggressive form of lung cancer.”

Merck says the data will be shared with FDA, which last month granted a breakthrough therapy designation for the therapy.

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