Colorectal cancer is a major public health problem worldwide with increasing morbidity and mortality. Numerous exogenous and endogenous factors are involved in colorectal carcinogenesis: age, sex, diet, smoking, alcohol consumption, exposure to harmful environmental factors, intestinal microbiota, bacterial and viral infections, the ability of the host immune system to respond, genetic factors, etc. The present study analyzed histopathologically and immunohistochemically a number of 36 cases of colorectal adenocarcinomas. The existence of an accentuated cell pleomorphism was noted, which corresponds to different clones of tumor cells, in the same tumor coexisting aspects of tubular adenocarcinoma, mucinous areas and even signet-ring cell. The tumor stroma was mainly of the desmoplastic type, but also of the lax type, more or less infiltrated with inflammatory cells. Evaluation of immunomarkers for cancer stem cells (CSCs) showed that none of the markers used alone [cluster of differentiation (CD)133, CD44, aldehyde dehydrogenase 1 family member A1 (ALDH1A1), CD24, CD26] show CSCs.