Causes of Colorectal Tumors
Jan 17, 2022
Source: Cainiu Health
Dr. Wu Xuehui
Introduction
1. A high-fat, low-fiber diet—particularly excessive intake of animal saturated fats—increases bile secretion and leads to fiber deficiency.
2. Colonic inflammation, especially chronic ulcerative colitis, elevates the risk of colorectal cancer by 4- to 20-fold compared with the general population.
3. Colorectal adenomas: The genetic alterations observed in colorectal adenomas closely resemble those in colorectal cancer, with a similarity rate approaching 63%.
A polyp is any mass of tissue arising from the intestinal wall and projecting into the lumen. Polyps may be sessile (broad-based) or pedunculated (attached by a stalk), and their sizes vary considerably. Histologically, these lesions are classified as: tubular adenoma, tubulovillous adenoma, villous adenoma, hyperplastic polyp, hamartomatous polyp, juvenile polyp, polypoid carcinoma, pseudopolyp, lipoma, leiomyoma, or other rare tumors. What, then, are the causes of colorectal tumors? The following section addresses this question.
Causes of Colorectal Tumors
1. High-fat, low-fiber diet: Excessive intake of animal saturated fats increases bile secretion. A deficiency in dietary fiber slows intestinal transit time, thereby prolonging exposure of the colonic mucosa to cholesterol and bile acid metabolites present in food—both factors that elevate the risk of colorectal tumor development.
2. Chronic colonic inflammation: Patients with chronic ulcerative colitis face a 4- to 20-fold increased risk of developing colorectal cancer compared with the general population.
3. Colorectal adenomas: Genetic alterations observed in colorectal adenomas closely resemble those found in colorectal carcinomas, with an approximate concordance rate of 63%.
4. Hereditary factors: Adenomatous polyposis coli (APC) syndrome—including familial adenomatous polyposis (FAP), Gardner syndrome (characterized by colonic polyposis, soft-tissue tumors, and osteomas)—confers a fourfold increased risk of colorectal cancer.
5. Other factors: These include schistosomiasis, environmental exposures, and smoking.
The above outlines the major etiological factors associated with colorectal tumors. We hope this information is helpful to you.
