Carboplatin + Paclitaxel + Cetuximab (PCC) After Failure of Pembrolizumab +/- First-line Chemotherapy in Recurrent/Metastatic Squamous Cell Carcinoma of the Head and Neck

"PCC protocol (Paclitaxel - Carboplatin - Cetuximab) by intravenous injection for 16 cycles. 1 cycle lasts 1 week. The Carboplatin + Paclitaxel administration schedule 3 weeks out of 4, with weekly Cetuximab is authorized.~After 16 cycles: maintenance with Cetuximab 500 mg/m2 every 14 days until unacceptable toxicity or progression or death."