[Bladder-Infiltrating Sigmoid Colon Cancer Successfully Treated with Neoadjuvant Chemotherapy and Radical Resection-A...

A 71-year-old man presented with the chief complaints of constipation, melena, and weight loss, and sigmoid colon cancer was suspected on lower gastrointestinal endoscopy. The cancer was diagnosed as RAS wild type adenocarcinoma(tub2)on biopsy. Abdominal contrast-enhanced CT revealed a mass with a maximum diameter of 55mm in the sigmoid colon; therefore, bladder infiltration was suspected. The Group 1 lymph nodes were bulky, with a maximum diameter of 50 mm, and No. 253 lymph node was enlarged. No fistulas were found on cystoscopy. The sigmoid colon cancer was cT4b(bladder), N3, M0, cStage Ⅲc. After performing a colostomy, neoadjuvant chemotherapy with mFOLFOX6 plus panitumumab was started. Radical surgery was performed after 3 courses of chemotherapy. The clinical treatment effect was PR, and the final histopathologi- cal examination revealed ypT3, ypN0(0/17), R0, ypStageⅡa. The therapeutic effect was Grade 2a. Postoperative adjuvant chemotherapy was performed for 6 months with mFOLFOX, and there have been no signs of cancer recurrence for 9 postoperative months. We experienced a case of colon cancer with suspected bladder infiltration, successfully treated with neoadjuvant chemotherapy and radical surgery.