Treatment options for recurrent or metastatic (R/M) head and neck squamous cell carcinoma (HNSCC) are limited, especially for patients who progress after immune checkpoint inhibitor (ICI) therapy. This phase Ib study investigates the efficacy and safety of SCT200, an epidermal growth factor receptor (EGFR) antibody, combined with paclitaxel or docetaxel in R/M HNSCC patients who have failed both platinum-based chemotherapy and programmed cell death protein 1 (PD-1) inhibitors. This was a multicenter, open-label study enrolling patients with resistance or intolerance to platinum-based chemotherapy and PD-1 inhibitors. Patients received intravenous SCT200 (6 mg/kg weekly for 12 weeks, followed by 8 mg/kg every two weeks). Paclitaxel (80 mg/m