GPC1 and familial pancreatic carcinoma: Among 60 specimens of pancreatic cancer, 3 cases (5%) showed high GPC1 expression (IHC score of +3), 56 cases (93%) showed low to intermediate levels of staining (IHC scores of +1 or +2), and no immunoreactivity was observed in 1 case (2%) (Supplementary Fig. 4 and Supplementary Table 3).