Among these genes, ABCA1 marked monocytes and macrophages with high TGF beta signaling, accurately reflecting tumor-associated immunosuppression in blood and liver.<h4>Conclusion</h4>Early-stage HCC induces a reversible, systemic immunosuppressive transcriptome captured by a monocyte-derived 23-gene blood signature; tumor removal partially restores this profile within three months. The gene discussed is ABCA1; the disease is hepatocellular carcinoma.