PTBP1 and colonic neoplasm: We also determined protein levels of PTBP1 in 6 different human colon cancer cell lines (HCT-116, SW480, HCT-8, HT-29, DLD1 and loVo), human normal colon epithelial cell lines (CCD 841 CoN) and human normal colon fibroblast cell line (CCD-112 CoN).