[A Case of R0 Resection after Neoadjuvant Chemotherapy for the Transverse Colon Cancer with Invasion of the Duodenum, Pancreas and Liver].

A 70s-year-old woman was diagnosed with advanced transverse colon cancer with an invasion of the duodenum, pancreas and liver. Pre-operative diagnosis was cT4b(the duodenum, pancreas and liver), N1b, M0, cStage Ⅲc. Neoadjuvant chemotherapy was performed for R0 resection. Since the tumor shrank, radical resection(R0)was performed. The standard treatment for resectable advanced colon cancer is surgical therapy in JSCCR Guidelines 2024 for the Treatment of Colorectal Cancer. On the other hand, neoadjuvant chemotherapy for locally advanced colon cancer is reported to contribute to prolong prognosis by increasing the proportion of R0 resection. Our hospital has a policy of neoadjuvant chemotherapy followed by surgical treatment for T4b cases, and the same policy was applied to this case. A successful case of R0 resection after neoadjuvant chemotherapy for advanced transverse colon cancer with invasion of the duodenum, pancreas and liver is reported.