CRP and lung cancer: Systemic inflammation and nutritional status, as measured by the systemic inflammatory response index (SIRI), prognostic nutrition index (PNI), neutrophil to lymphocyte ratio (NLR), platelet to lymphocyte ratio (PLR), and C-reactive protein (CRP)/albumin ratio (CAR), are associated with survival of many malignancies (12–16), including lung cancer (17–20).