A research indicated that with the adoption of etomidate in resection operation of lung adenocarcinoma, the quantity of CD8 + T cells in patients’ blood after the operation was lower than in that in the propofol group but higher than that in the propofol group 24 hours after the operation, which illustrated that etomidate had smaller effects on the immune system of patients with lung adenocarcinoma (62), and its adoption could improve immune suppression of the body in the perioperative period. The gene discussed is CD8A; the disease is lung adenocarcinoma.