Colorectal cancer is second leading cause of deaths in the United States. Various approaches available for The poor site specificity of pH dependent systems, because of large variation in the pH of gastrointestinal tract, was well established. The timed-release systems release their load after a predetermined period of administration. These are designed to resist the release of the drug in stomach and small intestine and release of the drug takes place in colon. Methotrexate (MTX) is a used in the treatment of colon cancer and now a days rheumatic disease. MTX is a folate antimetabolite. MTX...