For differentiating between pneumonic-type IMA and infectious pneumonia using ROC analysis, we analyzed the combined clinical variables of age, elevation of C-reactive protein level, fever and family history of cancer (model 1), air space (model 2), CT attenuation value (model 3), combination of air space and CT attenuation value (model 4), and combination of clinical variables of age, elevation of C-reactive protein level, fever, family history of cancer, air space and CT attenuation value (model 5). This evidence concerns the gene CRP and cancer.