DAPK1 and nasopharyngeal carcinoma: Based on the analysis of DAPK promoter methylation in 1048 NPC samples and 446 non-cancerous samples, it is indicated that the presence of the DAPK promoter was significantly higher in NPC samples than in non-tumorous samples (NPC: 56.94% vs. non-tumorous samples: 9.28%) (Figure 2).