Plant foods and differences between colon and rectal cancers

Area of Science:

• Epidemiology
• Nutritional Science
• Oncology

Background:

• Colorectal cancer (CRC) is a significant global health concern.
• Dietary patterns, particularly plant food consumption, are investigated for their role in cancer risk.
• Understanding site-specific and sex-specific associations is crucial for targeted prevention strategies.

Purpose of the Study:

• To investigate the association between plant food intake and the risk of colon and rectal cancers.
• To determine if this association differs by tumor subsite (colon vs. rectum) and by sex.

Main Methods:

• A case-control study was conducted in Montevideo, Uruguay, involving 484 colorectal cancer cases and 1452 controls.
• Participants were frequency-matched for age, sex, residence, and urban/rural status.
• Dietary intake was assessed using a detailed food frequency questionnaire covering 64 items, including vegetables, fruits, and cereals.

Main Results:

• Inverse associations were observed between rectal cancer risk and intake of total plant foods, total vegetables, cooked vegetables, potatoes, and legumes.
• When stratified by sex, plant food intake showed a significant protective effect for rectal cancer only in men (OR=0.4, 95% CI 0.2-0.7).
• No significant association was found between plant food intake and rectal cancer risk in women, possibly linked to high bread intake.

Conclusions:

• Plant foods appear to be protective against rectal cancer in men.
• Dietary plant food intake is not associated with rectal cancer risk in women in this population.
• Further research is needed to elucidate the role of specific food components and gender-specific dietary habits in colorectal cancer etiology.