This is a randomized, open-label, multicenter Phase III study to compare the efficacy and safety of MRG003 versus cetuximab/methotrexate as second/third line of therapy in patients with RM-SCCHN who have previously failed PD-1 (L1) inhibitors and platinum-based therapy. Approximately 180 patients will be enrolled, randomized, and stratified according to the following: Eastern Cooperative Oncology Group Performance Status (ECOG PS, 0 vs 1) and prior treatment with anti-EGFR mAb (yes vs no). For patients in the control group, cetuximab will be selected as comparator if no prior treatment with anti-EGFR mAb; otherwise, methotrexate will be selected.~After signing the informed consent and screened per inclusion/exclusion criteria, eligible patients will be randomized at a ratio of 1 : 1 and treated with MRG003 (2.3 mg/kg, IV, d1, Q3W) or cetuximab (400 mg/m2 for the first week and 250 mg/m2 for subsequent weeks, QW) / methotrexate (40 mg/m2, IV, QW) until disease progression, death, intolerable toxicity, withdrawal of consent, initiation of a new anti-tumor therapy, or other reasons leading to treatment discontinuation as specified by protocol.
The objective of this study is to compare the efficacy and safety of MRG003 versus cetuximab/methotrexate as second/third line of therapy in patients with RM-SCCHN who have previously failed PD-1 (L1) inhibitors and platinum-based therapy.