- A novel mutant allele of the CYP2A6 gene (CYP2A6*11 ) found in a cancer patient who showed poor metabolic phenotype towards tegafur. Daigo, S., Takahashi, Y., Fujieda, M., Ariyoshi, N., Yamazaki, H., Koizumi, W., Tanabe, S., Saigenji, K., Nagayama, S., Ikeda, K., Nishioka, Y., Kamataki, T. Pharmacogenetics (2002)