MRG003 Plus Toripalimab Versus Toripalimab as Neoadjuvant Therapy for PD-L1-Positive, Resectable, Locally Advanced Head and Neck Squamous Cell Carcinoma

This is a multicenter, prospective, randomized, controlled Phase II trial evaluating the safety and efficacy of MRG003 (Becotatug vedotin) combined with Toripalimab versus Toripalimab alone as neoadjuvant therapy for PD-L1-positive, resectable locally advanced head and neck squamous cell carcinoma. A total of 65 subjects are planned (43 experimental, 22 control). The experimental arm receives two cycles of MRG003 (Becotatug vedotin) 2.0 mg/kg intravenously on Day 1 followed by Toripalimab 240 mg intravenously on Day 1 every 3 weeks, while the control arm receives two cycles of Toripalimab 240 mg alone. After neoadjuvant therapy, both arms undergo radical surgery 3-4 weeks later, followed by risk-adapted adjuvant radiotherapy or chemoradiotherapy with concurrent Toripalimab (3 cycles) and then 12 cycles of adjuvant Toripalimab maintenance. The primary endpoint is the major pathological response rate.