• Median overall survival (OS) outcomes and encouraging anti-tumor activity observed with petosemtamab plus pembrolizumab in first-line (1L) recurrent or metastatic PD-L1+ head and neck squamous cell carcinoma (r/m HNSCC), with responses observed across HPV-positive and HPV-negative disease
• Phase 3 program in 1L HNSCC is ongoing, with topline data anticipated later this year

Genmab A/S (NASDAQ:GMAB) today announced updated results from a Phase 2 trial evaluating petosemtamab, an investigational IgG1-bispecific antibody targeting the epidermal growth factor receptor (EGFR) and leucine-rich repeat containing G-protein-coupled receptor 5 (LGR5), in combination with pembrolizumab for first-line (1L) treatment of recurrent/metastatic PD-L1+ head and neck squamous cell carcinoma (r/m HNSCC). In the 1L combination arm, treatment with petosemtamab plus pembrolizumab achieved a median overall survival (OS) of 28.2 months, associated with an overall response rate (ORR) of 63% and median progression free survival (mPFS) of 9.0 months in efficacy-evaluable patients (n=43), including a complete response (CR) rate of 19%. The findings were presented at the European Society for Medical Oncology (ESMO) Congress 2026, held in Madrid, Spain.

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