DAPK1 and head and neck cancer: DAPK1 methylation frequently occurs in head and neck cancers (Worsham, Chen, Meduri, Nygren, & Errami, 2006), non-small cell lung carcinoma (Esteller, Sanchez-Cespedes, Rosell, Sidransky, & Baylin, 1999), gastric and colorectal carcinomas (Lee, Leung, Chan, Ng, & Tong, 2002; Satoh, Toyota, Itoh, Kikuchi, & Obata, 2002).