THBS1 and colonic neoplasm: Two cell lines from each tumor type were assessed for their methylation status for COL1A2, THBS1, TNFRSF10D and UCHL1. Using the same cut off as for the melanoma cell lines and tumors, the percentage methylation for the COL1A2 and UCHL1 CpGs islands was 65% and 82% in the esophageal cancer cell lines respectively and 92% and 90% in the colon cancer cell lines respectively.