For instance, expression of oncogenes (MYC, ERBB2, CCND1) that are used as diagnostic and prognostic markers and genes important in cell proliferation (TGF β) were affected by SARS-CoV-2 infection suggesting that viral infection is critical to tumorigenesis (Souchelnytskyi, Nera & Souchelnytskyi, 2021). The gene discussed is CCND1; the disease is viral infectious disease.