Prognostic analysis for carcinoid tumours of the rectum: a single institutional analysis of 106 patients

Aim  Rectal carcinoid is a rare rectal tumour with a good prognosis. The aim of this study was to assess its clinicopathological characteristics and prognostic factors in a single institution. Method  Clinical and pathological information was retrospectively collected in a single institution, and patients’ outcomes were determined. Multivariate analyses were performed to find independent prognostic factors attributed to overall survival. Results  A total of 106 patients with rectal carcinoid were included. In all, 66% of the patients underwent transanal local excision and 34% had transabdominal surgery. The 5‐year survival rate was 87%. Muscularis invasion was the only independent prognostic factor for predicting 5‐year survival ( P  = 0.00046). Tumour size was found to be significantly associated with muscular invasion ( P  = 0.00003). The area under the curve of tumour size in the receiver operating characteristic curve for predicting muscular invasion was 0.92. Conclusion  Patients with rectal carcinoid have a good prognosis. Muscular invasion is an independent risk factor of survival.