Tomatoes and colorectal cancer.

Colon cancer risk: Data about the relation between tomatoes/tomato juice and colon cancer risk was provided by a pooled analysis of 12 cohorts (29), and 2 additional cohorts (24, 25). No associations with high vs low consumption were found consistently, but the pooled analysis found a protective effect (RR = 0.88) at intermediate levels of consumption (1 tomato/wk up to 0.5/day).
Rectal cancer risk: Data about the relation with rectal cancer was provided by 5 cohorts (6, 9, 24, 25). No associations were found consistently.
Colorectal cancer risk: Data from articles about 3 cohorts was not stratified by cancer site (though information about colon cancer was often used by the pooled analysis). No association was found in any of the cohorts (17, 23, 27).
Mortality: Data about colorectal cancer mortality was provided by 2 cohorts. A protective effect against colon cancer mortality among men, but not women, was found in one cohort, but no information was provided about the strenght, and significance of the association, and no adjustments for possible confounders were made (7). No other significant associations were found.

Conclusion: A significant protective effect at an intermediate level of tomato (juice) consumption against total colon cancer risk was found in a pooled analysis of 12 cohorts. Tomatoes/tomato (juice) possibly protects against total colon cancer risk at the level of consumption of 1 tomato/week to < 0.5 tomato/day (- 12).

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