MUC1 and neoplasm: These primary cancer cell lines were established from tumor biopsies of F1 PyMT (Tg(MMTVPyMT)634Mul 22) crossbred with human MUC1 (C57BL/6-TG(MUC1)79.24GEND/J 15) double transgenic mice (PyMTxhuMUC1 mice).