[A Case of Locally Advanced Sigmoid Colon Cancer Occupying the Pelvis with Successful Total Posterior Pelvic Exenteration after Triplet Chemotherapy].

We report a case of locally advanced colon cancer that directly invaded the rectum wall and uterus resulting in huge mass in the whole pelvis that we could successfully made complete radical resection of the whole tumor without exposing the tumor to the surgical margin after the triplet chemotherapy. The patient was a 57-year-old woman complaining of anus pain, melena, fever, and weight loss. Although swelling of the regional lymph node was observed, no distant metastasis was found resulting in clinical diagnosis of Stage Ⅲb. However, oncologically safe complete resection seemed difficult; thus, chemotherapy( 3 courses of FOLFOX followed by 3 courses of FOLFOXIRI plus bevacizumab)was administered. As a result, significant tumor reduction was observed; therefore, the tumor was completely resected with posterior pelvic exenteration. Final staging was ypT4bypN0M0(ypStage Ⅱ). Eight courses of CapeOX was administered as adjuvant chemotherapy.