RecruitingPhase 2Drug trialCetuximab After Immunotherapy for the Treatment of Head and Neck Squamous Cell CancerThis is a Phase II treatment, non-randomized, open label clinical trial to study the efficacy of the Cetuximab when administered as single agent in recurrent/ metastatic head and neck squamous cell carcinoma after the failure or intolerance of immuno-oncology or immuno-oncology combined with chemotherapy.