Association between phytosterol intake and colorectal cancer risk: a case-control study

Area of Science:

• Nutritional Epidemiology
• Cancer Prevention
• Molecular Nutrition

Background:

• Phytosterols show anti-cancer properties in rodent models, inhibiting cell cycle progression and promoting apoptosis.
• Epidemiological data on phytosterols and colorectal cancer risk are limited, especially in Asian populations.

Purpose of the Study:

• To investigate the association between dietary phytosterol intake and colorectal cancer risk in a Chinese population.
• To examine specific phytosterol compounds and their relationship with colorectal cancer risk.

Main Methods:

• A population-based case-control study involving 1802 colorectal cancer cases and 1813 controls.
• Dietary intake assessed using a validated Food Frequency Questionnaire (FFQ).
• Statistical analysis using multivariable logistic regression to calculate odds ratios (OR) and 95% confidence intervals (CI).

Main Results:

• Increased total phytosterol intake was associated with a 50% reduction in colorectal cancer risk (OR=0.50, 95% CI 0.41-0.61).
• Inverse associations were observed for beta-sitosterol, campesterol, and campestanol.
• Stigmasterol intake showed a positive association with colorectal cancer risk, particularly in women.

Conclusions:

• Dietary intake of total phytosterols, beta-sitosterol, campesterol, and campestanol is inversely associated with colorectal cancer risk in the Chinese population.
• Stigmasterol may have a differential effect on colorectal cancer risk, with a potential increase in women.