- Interactions between CYP2C9 and UGT1A6 polymorphisms and nonsteroidal anti-inflammatory drugs in colorectal cancer prevention. Samowitz, W.S., Wolff, R.K., Curtin, K., Sweeney, C., Ma, K.N., Andersen, K., Levin, T.R., Slattery, M.L. Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association. (2006)