The inclusion criteria were as follows: (1) NSCLC was pathologically diagnosed; (2) NSCLC was stage III or IV according to the American Joint Committee on Cancer (AJCC) 8th edition; (3) the patient received chemotherapy for more than two cycles without a combination of targeted therapy, radiation therapy and immune therapy; (4) the patient had no other cancer history and laboratory test results were obtained before treatment.
The exclusion criteria were as follows: (1) patients with missing or incomplete data; (2) patients who underwent surgery, radiotherapy, immunotherapy before standard chemotherapy protocols, (3) patients who had obvious fever and pneumonia before chemotherapy.
This retrospective study was approved by the ethics committee of the Affiliated Hospital of Xu Zhou Medical University.