Comparison of surgical procedures and short- and mid-term outcomes for transverse colon cancer: A retrospective study from a single center.

39 Background: For transverse colon cancers located in the right to mid portion, right hemicolectomy (RHC) and transverse colectomy (TC) are both surgical options. However, consensus and the criteria for selecting the procedure is lacking due to the low incidence of transverse colon cancer and the limited robust evidence. Aim: To compare short- and mid-term outcomes of RHC and TC among transverse colon cancer patients. Methods: We retrospectively reviewed 70 patients who underwent curative resection for transverse colon cancer at our institution between May 2018 and May 2025. Patients were categorized into the RHC group (n=51) and the TC group (n=19). Surgical approaches included robot-assisted (n=40), laparoscopic (n=26), and open (n=4). Clinicopathological characteristics and short- and mid-term outcomes were compared. Results: Patient backgrounds were comparable between groups. Clinical stage I/II/III/IV was 21/11/13/6 in the RHC group and 9/4/6/0 in the TC group. Median operative time was 216 minutes for the RHC group and 187 minutes for the TC group (p=0.15). Blood loss was minimal in both groups (0 mL vs. 5 mL, p=0.67). No Clavien-Dindo grade III or higher complications occurred. Grade II complications occurred in 6 (12%) RHC and 2 (11%) TC, with no significant difference. The number of harvested lymph nodes was significantly higher in the RHC group (33 vs. 14, p