Biomarkers and other variables
SCLC
SCLC, LUNG CANCER
SCLC baseline clinicopathological factors were collected for each subject, such as gender, age, smoking history, US Veterans Lung Cancer Society (VALG) staging, chemotherapy, and thoracic radiotherapy history. Also, pre‐treatment lymphocyte, neutrophils, platelet, hemoglobin, RDW, albumin, globulin, total protein, LDH, carcino‐embryonic antigen (CEA), NSE, CRP, and blood sodium were recorded and evaluated by the hospital's examination criteria. All patients underwent standardized evaluation of the best efficacy of first‐line chemotherapy. NLR, PLR, AGR, LMR, CAR, PNI, and LCR were calculated as followed: