The USPSTF recommends against aspirin for prevention of colorectal cancer because it requires higher doses in order to accomplish this, however, if aspirin is recommended for cardiovascular disease or stroke prevention, there may be benefit obtained by aspirin in the prevention of cancer. According to a study by Bardia A et al mentioned above, cancer incidence and cancer mortality was reduced even in patients that used aspirin infrequently compared to those that never used it. (42)
Whey protein and cancer:
A low glutathione (GSH) concentration has been shown in research to be associated with an increase in risk of cancer. Whey proteins have been shown to increase GSH concentration which may prevent the development of several types of tumors. Bounous G et al suggested that whey protein antitumor activity results from an increase in GSH concentration. (43)