MUC-1 mucin from breast cancer cell lines (MCF-7, BT-20, and T47D) has simpler glycosylation pattern and fewer carbohydrate chains than MUC-1 from normal breast epithelial cells (MMSV1-1, MTSV1-7, and HB-2) with higher ratio of GlcN/GalN. Here, MUC1 is linked to breast carcinoma.