CEACAM5 and non-small cell lung carcinoma: A study involving 245 participants concluded that NLR (cut‐off = 2.14) can be used as a diagnostic tool for NSCLC, especially when combined with red blood cell distribution width (RDW), hemoglobin‐to‐red blood cell distribution width ratio (HRR), and carcinoembryonic antigen (CEA) [67].