Cell surface-associated mucin 1 (MUC1) (previously known as PUM, MCKD1), a highly glycosylated transmembrane heterodimeric protein and a transmembrane member of the mucin family, is highly expressed in various human malignant tumors including prostate cancers and is correlated with a poor prognosis [9, 10]. Here, MUC1 is linked to Familial prostate cancer.