CRP and cancer: Inexpensive and readily available inflammatory biomarkers, such as C-reactive protein to albumin ratio (CAR), C-reactive protein to prealbumin ratio (CPR), C-reactive protein to lymphocyte ratio (CLR), neutrophil to lymphocyte ratio (NLR), platelet to lymphocyte ratio (PLR) and monocyte to lymphocyte ratio (MLR), have been widely described in various diseases to predict prognosis, especially in malignant tumors.