Clinical Trial Comparing Induction Treatment With EGFR-ADC MRG003 Alone or in Combination With the Anti PD1 Pucotenlimab, Followed by Radiochemotherapy in Locally Advanced Squamous Cell Cancers of the Head and Neck

Inclusion Criteria: * Patients with Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0 or 1 * Evaluable tumor burden assessed by H\&N-computed tomography scan (CT-scan) or magnetic resonance imaging (MRI), based on RECIST v 1.1 * Patients eligible to cisplatin-based chemotherapy * No hearing loss by clinical assessment or ≤ grade 2 hearing impairment (according to NCICTCAE v.5 * No prior treatment with chemotherapy, immunotherapy and targeted therapy for H\&N cancer, radiotherapy or surgery in the head and neck region. Exclusion Criteria: * Metastatic disease (stage IVC as per AJCC/TNM, 8th Ed.). * Patients having received prior therapy with anti-PD1, anti-PD-L1, anti-PD-L2, anti- CD137, or anti-CTLA-4 antibody (or any other antibody or drug specifically targeting Tcell co-stimulation or checkpoint pathways). * Treatment for other diseases with an investigational agent or use of an investigational device within 4 weeks of the first dose of study treatment * History of another malignancy within the last 3 years prior to randomization, with the exception of completely resected non-melanoma cell skin cancer outside the head and neck area or completely resected stage I breast cancer, or completely resected in-situ nonmuscular invasive bladder, cervix, uterine and/or prostate (Gleason 6) carcinomas, or T1a squamous cell carcinoma of the esophagus or rectum/anus. * Patients with clinically significant (i.e., active) cardiovascular disease: cerebral vascular accident/stroke (\< 6 months prior to enrollment), myocardial infarction (\< 6 months prior to enrollment), unstable angina, congestive heart failure (≥ New York Heart Association Classification Class II), or serious cardiac arrhythmia requiring medication, or known persistent reduced left ventricular ejection fraction \< 50%. * Patients with positive test for human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome (AIDS). * Patients with positive tests for hepatitis B virus surface antigen (HBsAg) or hepatitis C virus ribonucleic acid (HCV RNA) indicating active or chronic infection. Presence of other serious liver diseases, including chronic autoimmune hepatic disorders, primary biliary cirrhosis or sclerosing cholangitis.