CSMD1 and head and neck squamous cell carcinoma: The highest level of promoter hypermethylation was seen in immortal HNSCC cell lines with either hemizygous deletions (BICR56, BICR22, BICR82, BICR10 and T4) or absence of deletions (BICR63, BICR68 and H314) (detailed in Supplementary Data S13), and in the only immortal PPOL cell line (D9) that lacked CSMD1 deletions (Fig. 3, and Supplementary Data S8).