Immunohistochemical staining showed that the tumor tissue was positive for CgA, Syn, S - 100, CD10, and CD34, but negative for AFP, cytokeratin 19 (CK19), CK7, GS, GPC3, HSP70, with a Ki-67 labeling index of 2% (Figures 3B–F). Here, KRT19 is linked to neoplasm.