Promotor hypermethylation pattern of p16, O6-methylguanine-DNA-methyltransferase, and death-associated protein kinase in tumors and saliva of head and neck cancer patients. - Bittencourt Rosas,S.L.; Koch,W.; da Costa Carvalho,M.G.; Wu,L.; Califano,J.; Westra,W.; Jen,J.; Sidransky,D. (Cancer Res, 2001)