CRP and small cell lung carcinoma: Previous studies reported some serum systemic inflammatory markers such as C‐reactive protein (CRP)/albumin ratio (CAR), albumin/globulin ratio (AGR), neutrophil/lymphocyte ratio (NLR), platelet/lymphocyte ratio (PLR), and prognostic nutritional index (PNI) may affect the survival of SCLC.15, 16, 17