IFT20 and breast cancer: To determine the expression of IFT20 in breast cancer cells, two human breast cancer cell lines, MCF-7 and MDA-MB-231, as well as one immortalized human breast epithelial cell line, HBL-100, were chosen for the analyzes (Soule et al., 1973; Cailleau et al., 1974; Chandrasekaran and Davidson, 1979).