CRP and cancer: Indexes of a systemic inflammatory response (SIR), such as the C-reactive protein (CRP)-albumin (ALB) ratio (CAR), the platelet-lymphocyte ratio (PLR), the prognostic nutritional index (PNI), the neutrophil-lymphocyte ratio (NLR), and the lymphocyte-monocyte ratio (LMR), have been used not only to determine the nutritional status and complications but also to predict prognosis of patients in various cancers [7–11].