NCT07546383 2026-04-22A Study Investigating the Efficacy and Safety of the Combination of Iparomlimab and Tuvonralimab With or Without Chemotherapy in Second-line and Subsequent Treatments for Recurrent or Metastatic Head and Neck Squamous Cell CarcinomaThe Second Affiliated Hospital of Hainan Medical UniversityPhase NA Recruiting32 enrolled