ARG1 and neoplasm: Immunohistochemical staining showed that the tumor cells were negative for AE1/AE3 (Fig. 1g), CK18 (Fig. 1h), CK7 (Fig. 1i), Hepatocyte Paraffin-1(Hep Par-1) (Fig. 1j), Glypican-3 (GPC-3), Arginase-1 (ARG-1), CD56 (Fig. 1k), Chromogranin A (CgA), Synaptophysin (Syn), Vimentin, and Carcinoembryonic antigen (CEA).