Our findings from this meta-analysis suggest that fish consumption is inversely associated with colorectal cancer...current evidence that suggests that fish consumption may reduce the risk of colorectal cancer by as much as 12%. The American Journal of Medicine
http://www.amjmed.com/article/S0002-9343%2812%2900123-4/fulltext
http://www.amjmed.com/article/S0002-9343%2812%2900123-4/fulltext