MUC1 and Familial prostate cancer: Further, the MUC1 gene expression level was very high in DU145 cells, i.e. 1.27% of GAPDH, and very low in PC3 cells, i.e. 0.0002% of GAPDH, and LNCaP C-81 cells, i.e. 0.008%, suggesting that the low expression level of MUC1 gene is a limiting factor for the synthesis of sLea in these two prostatic cancer cells.