[Histological factors predicting loco-regional lymph node metastasis in early invasive colorectal adenocarcinoma pT1]. / Estudio de factores histológicos predictivos de metástasis ganglionar locorregional en adenocarcinoma colorrectal mínimamente invasivo pT1.

ABSTRACT

INTRODUCTION: Endoscopic resection is the common treatment in pT1 colorectal adenocarcinoma whenever possible. The presence of adverse histological factors requires subsequent lymph node evaluation. MATERIALS AND METHODS: We selected 29 colorectal pT1 adenocarcinoma including endoscopic polypectomies and the corresponding surgical specimens. All histologic parameters associated with N+ were evaluated by 2 pathologists, including tumor differentiation grade, depth of invasion in the submucosa, angiolymphatic invasion (ALI), perineural invasion, chronic inflammation, tumor budding, poorly differentiated cluster, pre-existing adenoma, tumor border, and endoscopic resection margin. Univariate and multivariate logistic regression analysis were performed to assess the individual capacity of each variable to predict N+. RESULTS: In the univariate analysis, rectal tumor localization, ALI and poorly differentiated cluster was significantly associated with N+. Among the significant parameters, ALI had the highest area under the ROC curve (0.875). Multivariate analysis showed no independent variables associated with N+. CONCLUSIONS: We confirm that ALI and the presence of poorly differentiated cluster are frequently associated with N+ in early colorectal cancer. Consequently, these parameters should be routinely evaluated by pathologists.