These findings underscore HDV’s distinct and additive role in accelerating liver fibrosis, beyond the effect of HBV alone, consistent with prior evidence that chronic HDV infection accelerates progression to cirrhosis and hepatocellular carcinoma [6, 22], which may be explained by HDV-driven synergistic activation of HBV X (HBx)-mediated TGF-β and c-Jun signaling cascades, promoting hepatic fibrogenesis [23, 24]. The gene discussed is TGFB1; the disease is Hepatic fibrosis.