Common markers in both COVID-19 and cancer are carbohydrate antigens (CA) 125 and 153, carcinoembryonic antigens (CEA), human epididymis protein 4 (HE4), C-reactive protein (CRP), and cytokeratin-19 fragment (CYFRA21-1); these markers are increased in both COVID-19 and cancer. The gene discussed is CEACAM5; the disease is cancer.