Immunostaining of the tumor showed hepatocyte, arginase 1, Melan-A, HMB-45, CK20, PAX8, CD10, CA9, and TFE3 negativity, as well as AE1/AE3 and CK7 positivity, leading to the diagnosis of clear cell carcinoma of the liver. This evidence concerns the gene CA9 and neoplasm.