[Clinical Significance of Preoperative Chemotherapy for Advanced Colorectal Cancer]

We examined 22 cases who underwent preoperative chemotherapy in our hospital from 2013 April to 2018 December. Seven patients were treated as neoadjuvant chemotherapy(NAC). Out of 15 patients with unresectable diseases before chemotherapy, 6 patients were able to R0 resection after chemotherapy(conversion). Although only one patients was underwent RM1 resection, the other patients were underwent RM0 resection. The median overall survival was 42 months in NAC group, 28 months in conversion group, and 17 months in palliative resection group, respectively. Recurrence was observed in 1 patient in NAC group, however, all patients had recurrent disease in conversion group. In this study, although further examination should be done according to the clinical significance of preoperative chemotherapy, preoperative chemotherapy may be carried out without severe adverse event and severe postoperative complication.