The KEGG pathway also showed that PTTG1 was linked to human T-cell lymphotropic virus type-1 (HTLV-1) infection, and HTLV-1 is a retrovirus that is closely related to adult T-cell leukemia/lymphoma (ATL) (Guerrero et al., 2020). The gene discussed is PTTG1; the disease is adult T-cell leukemia/lymphoma.