Figure 1

Immunohistochemical analysis of hENT1, dCK, and RRM1 expressions in biliary tract cancer. Representative immunohistochemical results. Human equilibrative nucleoside transporter 1 (hENT1): (A) high staining and (B) low staining. Deoxycytidine kinase (dCK): (C) high staining and (D) low staining. Ribonucleotide reductase subunit M1 (RRM1): (E) high staining and (F) low staining. Magnification × 200, scale bar = 100 μm.