eP541 - Extended Right or Transverse Colectomy in Transverse Colon Cancer?

Purpose/Background: Due to the lack of randomized controlled trials of transverse colon cancer (TCC) treatment, there is no standardized surgical method. The decision to perform a right colectomy (RC), or a transverse colon resection (TCR) in mid-TCC usually depends on the hospital's internal policy or the surgeon's decision. We aimed to evaluate oncological outcomes and the most appropriate type of surgery for the middle part of TCC.Methods/Interventions: Methods. We analyzed tumor stage, and the outcomes after surgical treatment of TCC. We compared groups of different TCC localization: in hepatic flexure, and in the middle part of the transverse colon, in terms of outcomes. Patients were then regrouped according to the type of surgery chosen (RC or TCR), and tumor stage and outcomes were repeatedly compared.Results/Outcomes: 69 patients were included in the analysis from 2014 to 2018 year. In comparison to TCC localization, 3 or 4 cancer stage has been identified for 62 % in the middle part of the TCC and 47% in the TCC of the hepatic flexure. The disease progression in 5 years was more frequently observed in mid-transverse colon tumors (30.77%) compared to hepatic flexure (3.33%). 96% of patients with hepatic flexure TCC underwent RC, while 46% of patients with the middle part of TCC were treated with TCR and 35% with RC. 8 patients were excluded from further analysis for the other selected types of surgery (subtotal colectomy or left colectomy). Grouping patients by surgery type – 51 % of patients in the RC group were diagnosed with 3 or 4 stages of TCC and 61% in the TCR group. Disease progression was found in 14% of patients in the RC group compared to 33% in the TCR group.Conclusion/

Discussion: Conclusion. Tumors of the middle part of the transverse colon have a worse prognosis than tumors of the hepatic flexure of the transverse colon. In the case of mid-TCC tumors, RC offers a better oncological outcome compared to TCR.