katherine van loon, a cancer specialist with ucsf. thank you so much for being with us. >> thanks so much for having me. >> i can guarantee you there are people at home right now wondering if their alcohol consumption is increasing their risk of cancer. what do you make of the results of this study? >> should we be looking at alcohol like cigarettes in terms of its link to cancer? >> so the data's still emerging and i think the take-home from this is that any alcohol creates some additive increase in risk for developing certain types of cancer. again, the study reported increased risks of breast cancer, colorectal related to the amount of alcohol that an individual consumes. >> so the study says excessive use of alcohol can link to cancer, but it also goes on to say even a small amount can increase your cancer risk. should we be rethinking what excessive means, what moderate alcohol intake is? earlier we reported that one drink at night for women is considered moderate use of alcohol, but should it be even less? should we be rethinkin