The adjusted results revealed that the incidence of lung cancer in male pneumonia patients was 50% when CEA × 0.008 + CY211 × 0.068 > 0.237 and the incidence of lung cancer in female pneumonia patients was 34.8% when CEA × 0.064 > 0.175 (that is CEA > 2.73 ng/mL). The gene discussed is CEACAM5; the disease is susceptibility to pneumonia measurement.