Some features differed significantly between the two studied groups of COVID-19, including decreased Hb level (p < 0.001), decreased absolute neutrophil count [ANC] (p < 0·001), decreased platelet count (p < 0.001), and high levels of ESR (p = 0·002) and D-dimer (p = 0·04). The gene discussed is GSTM1; the disease is COVID-19.