A study investigating the effect of moderate to heavy drinking (> 30g per day) on renal cell cancer (RCC) has concluded that alcohol is inversely associated with RCC in a dose-response manner, i.e. moderate drinkers had a decreased risk of renal cancer.
The study used data from NIH-AARP Diet and Health Study (n = 49 2187, 1814 cases). Results found that compared with > 0 to < 5g per day of alcohol consumption, the multivariate relative risk (95% confidence intervals) for 15 to < 30g and >/= 30g per day was, 0.75 (0.63-0.90) and 0.71 (0.59-0.85), respectively, in men and 0.67 (0.42-1.07) and 0.43 (0.22-0.84), respectively, in women.
The authors conclude that the alcohol consumption was inversely associated with RCC in a dose-response manner and that this inverse association may be extended to >/= 30 g per day of alcohol intake.

Source: “Alcohol consumption and risk of renal cell cancer: the NIH-AARP Diet and Health Study”, Lew JQ; Chow WH; Hollenbeck AR; Schatzkin A; Park Y, British Journal of Cancer, Vol 104, No 3, 2011, pp537-541