USFDA issues complete response letter for Patritumab Deruxtecan in EGFR-Mutated NSCLC: Merck, Daiichi Sankyo

The CRL results from findings pertaining to an inspection of a third-party manufacturing facility. The CRL did not identify any issues with the efficacy or safety data submitted.

Patritumab deruxtecan is a specifically engineered potential first-in-class HER3 directed DXd antibody drug conjugate (ADC) discovered by Daiichi Sankyo and being jointly developed by Daiichi Sankyo and Merck.

“We will work closely with the FDA and the third-party manufacturer to address the feedback as quickly as possible in order to bring the first HER3 directed medicine to patients with previously-treated EGFR-mutated non-small cell lung cancer.” said Ken Takeshita, MD, Global Head, R&D, Daiichi Sankyo. “We remain confident in the ability to develop this medicine to its full potential.”

“Patients with previously treated EGFR-mutated non-small cell lung cancer often experience recurrence and have limited treatment options.” said Marjorie Green, MD, Senior Vice President and Head of Oncology, Global Clinical Development, Merck Research Laboratories. "We are committed to working with Daichi Sankyo and the FDA to prioritize making patritumab deruxtecan available to these patients in need.”

In HERTHENA-Lung01, patritumab deruxtecan was studied in 225 patients with EGFR-mutated locally advanced or metastatic NSCLC following disease progression with an EGFR TKI and platinum-based chemotherapy, which demonstrated an objective response rate (ORR) of 29.8% (95% CI: 23.9-36.2), including one complete response and 66 partial responses. The median duration of response (DoR) was 6.4 months (95% CI: 4.9-7.8).

The safety profile of patritumab deruxtecan observed in HERTHENA-Lung01 was consistent with previous phase 1 clinical trials in NSCLC with a treatment discontinuation rate of 7.1% due to treatment-emergent adverse events (TEAEs). Grade 3 or higher TEAEs occurred in 64.9% of patients. The most common (≥5%) grade 3 or higher TEAEs were thrombocytopenia (21%), neutropenia (19%), anemia (14%), leukopenia (10%), fatigue (6%), hypokalemia (5%) and asthenia (5%). Twelve patients (5.3%) had confirmed treatment-related interstitial lung disease (ILD) as determined by an independent adjudication committee. One grade 5 ILD event was observed.