Furthermore, Ki-67 index was associated with CRP (21 patients with low CRP (<3.8 mg/dl) and high Ki-67 (≥35) vs. 31 patients with high CRP (≥3.8 mg/dl) and high Ki-67, Fisher’s exact test: p < 0.01) but not with the other patient and tumour characteristics (platelet count, PD-L1 positivity, presence of extrathoracic disease and extrathoracic primary tumour). Here, CRP is linked to neoplasm.