An Open-Label, single arm, Multi-Center phase II clinical study to evaluate the efficacy and safety of MRG003 in patients with recurrent or metastatic squamous cell carcinoma of head and neck.

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Willing to sign the ICF and follow the requirements specified in the protocol. * Expected survival time≥3 months. * Patients with histologically confirmed unresectable recurrent or metastatic squamous cell carcinoma of head and neck. * Failed prior platinum and/or anti-PD-1 treatment (Part A); failed or intolerant to at least one prior line of standard therapy (platinum-based regimen) (Part B) * Patients must have at least one measurable lesion according to the Response Evaluation Criteria in Solid Tumors (RECIST v1.1). * ECOG performance score 0 or 1. * Organ functions and coagulation function must meet the basic requirements. * Serum or urine pregnancy test negative within 7 days before the first dose of investigational drug. * Patients with childbearing potential must use effective contraception during the treatment and for 6 months after the last dose of treatment. Exclusion Criteria: * History of 4 or more systemic anti-tumor therapies for the recurrent or metastatic squamous cell carcinoma of head and neck. * ≥Grade 2 peripheral neuropathy * Prior anti-tumor therapy with MMAE/MMAF ADCs * BMI≤17 * Expected surgery or any other form of systemic or local anti-tumor therapy. * History of systemic chemotherapy within 3 weeks before the first administration of the investigational drug, targeted small molecule therapy within 2 weeks or 5 half-life periods before the first administration (whichever is shorter), antitumor biological therapy or immunotherapy within 4 weeks before the first administration, or major surgery. * Known active CNS metastasis and/or cancerous meningitis. * Residual toxicity reactions caused by previous anti-tumor treatment or abnormal values of laboratory tests higher than grade 1 (CTCAE v5.0). Prior Grade 3 to 4 immune-related AE (irAE) or ≥Grade 2 heart-related irAE. * Uncontrolled or poorly controlled heart disease. * History of pulmonary embolism or deep vein thrombosis within 3 months before the first administration of the investigational drug. * Known history of malignancy. * History of severe dermatosis. * Uncontrolled or poorly controlled hypertension. * Patients with a history of active bleeding, coagulopathy, or receiving coumarin anticoagulation therapy. * Known allergic reaction to any ingredients or excipients of investigational drugs. * Known active hepatitis B or C. * Complicated with severe, uncontrolled infection or known human immunodeficiency virus (HIV) infection, or diagnosed as acquired immunodeficiency syndrome (AIDS); or uncontrolled autoimmune disease; or history of allogeneic tissue/organ transplantation, stem cell or bone marrow transplantation, or solid organ transplantation. * Active bacterial, viral, fungal, rickettsia, or parasitic infections that require systemic anti-infective treatment. * Vaccination of live virus vaccine within 30 days before the first administration of the study drug. Inactivated seasonal influenza vaccine or approved COVID-19 vaccine is allowed. * History of previous or concurrent interstitial pneumonia, radiation pneumonitis, severe chronic obstructive pulmonary disease, severe pulmonary dysfunction, symptomatic bronchospasm, etc. * Patients receiving immunology-based treatment for any reason. * Uncontrolled pleural effusion, pericardial effusion or recurrent ascites. * Potent CYP3A4 inhibitors or inducers are in use and cannot be discontinued. * Women who are lactating or pregnant. * Other conditions that in the clinical judgement of the investigator make the patient not suitable for participation in this study.