DHCR7-DT and head and neck squamous cell carcinoma: In line with these data, higher levels of both endogenous/baseline and UVC-induced apurinic/apyrimidinic sites (all p < 0.05; Figure 2C,D) were observed in HNSCC cell lines when compared to normal cells, resulting in significantly increased accumulation of UVC-induced AP sites in malignant cells (p < 0.001; Figure 2E).