Clinicopathological Significances of Peritumoral Budding in Colorectal Cancer: A Detailed Analysis Based on Mucinous and Micropapillary Pattern.

The present study aimed to evaluate the correlations between peritumoral tumor budding (PTB) and the clinicopathological characteristics of colorectal cancer (CRC) according to histological components. The PTBs were investigated and divided into high and low groups. The clinicopathological significance and prognostic implications of PTB in CRC were evaluated. High PTB was found in 104 of 266 CRCs (39.1%). High PTB was significantly correlated with left-sided tumors, lymphatic invasion, lymph node metastasis, distant metastasis, and high pTNM stage. However, there was no significant correlation between PTB and the other clinicopathological characteristics. PTB was significantly higher in CRCs without the mucinous component than those with the mucinous component ( = 0.008). However, there was no significant difference between CRCs with and without the micropapillary pattern ( = 0.123). Patients with high PTB had worse recurrence-free survival than those with low PTB ( = 0.031). In the subgroup analysis based on histological components, a significant correlation between PTB and recurrence-free survival was found in CRC with a micropapillary pattern but not in those without a micropapillary pattern ( = 0.010 and = 0.178, respectively). These findings indicate that high PTB is significantly correlated with aggressive tumor behaviors and worse survival in patients with CRC. However, the prognostic implications of PTB can differ according to histological components.