PErioperative CISGEM + Rilvegostomig in High-Risk Resectable Intra Hepatic CholangioCarcinoma

"Administration of 4 cycles pre-operative and 4 cycles post-operative of Cisplatine associated to Gemcitabine with rilvegostomig~RILVEGOSTOMIG : For each cycle one administration at D1 every 3 weeks~• 750 mg IV administration over 60 minutes (up to a total of 90 minutes). CISGEM: For each cycle administration at D1 and D8 every 3 weeks~* Cisplatine 25 mg/m² in 1 hour IV in 1000 ml NaCl 0,9 % then 500 ml NaCl 0,9 %~* Gemcitabine 1000 mg/m² en 30 mn IV dans 250 ml NaCl 0,9 %"