Interestingly, 81 out of 90 (90.00%) HBsAg-positive HCC patients showed a high protein level of Syncytin-1, while Syncytin-1 overexpression was found only in 3 of 13 (23.08%) HBsAg-negative HCCs (Fig. 2j, Table 1). The gene discussed is ERVW-1; the disease is hepatocellular carcinoma.