779. IMMUNE CHECKPOINT INHIBITOR WITH CHEMOTHERAPY (CISPLATIN+5FU) FOR ADVANCED ESOPHAGEAL CANCER

Abstract Background First-line chemotherapy for advanced esophageal carcinoma results in poor outcomes. Compared with placebo plus chemotherapy, pembrolizumab plus chemotherapy improved overall survival in patients with previously untreated, advanced oesophageal squamous cell carcinoma according to the KEYNOTE-590. We studied 17patients for the unresectable esophageal cancer and gastroesophageal junction adenocarcinoma cases treated with pembrolizumab and chemotherapy at our hospital between November 2023 and May 2024. Methods 17 patients with advanced carcinoma of the thoracic esophagus having either T4 tumor or distant lymph node metastasis were enrolled in this study. pembrolizumab 200mg/m2 and CDDP 80 mg/m2 was administered on days 1 and 5-FU 800 mg/m2 was administered on days 1-5 intravenously 3corse in 3-week cycles. Results Back ground: Averaged Age 76 (55-86), male: female =16:1, location (Ce: Ut: mt: Lt: Jz =1:1:6:6:3), strength 71mm (30-120), Stage (IVA: IVB= 7:10), Pathology (SCC: AD= 16:1), Times (3 courses completed: uncompleted: ongoing=9:3:5), Response PR:SD:PD: unknown=6:1:2:8, Toxicity: iRAE: liver dysfunction: Febrile neutropenia=4:2:6, The incidence of Grade 3 or higher adverse events was 3/15. One toxicity-related death occurred. We performed conversive esophagectomy for 2 patients. After chemotherapy: operation: radiation: observation: death:=2:2:10:3 Conclusion and discussion Due to the small number of cases, it is unclear whether the treatment was safe in a single center. I would like to consider increasing the number of cases. We will show one toxicity-related death and two conversive operation.