<prompt> Colon carcinogenesis is associated with all exceptAPCkRASB-cateninNone  <response>: Etiology Risk factors of Ca Colon 1DIETARY FACTORS Low intake of dietary fibres High intake of carbohydrates and fat Diet deficient of cruciferous vegetables and vitamin A 2 PROTECTIVE EFFECT OF ASPIRIN 3 HNPCC 4 RISK FACTORS- age above 50, family history of colonic cancer, prior colorectal cancer, inflammatory bowel disorders, physical inactivity, smoking, alcohol consumption 5 GENETIC PATHWAY APC-beta catenin pathway K-RAS mutation SMAD2 and SMAD4 mutation Mutation of p53 Activation of telomerase Microsatellite instability pathway GENERAL AND SYSTEMIC PATHOLOGY RAMDAS NAYAK FIRST EDITION PAGE: 418,419 