MKI67 and squamous cell carcinoma: In this study, we retrospectively analyzed 65 NSCLC cases confirmed with pulmonary, ipsolaterally hilar, or mediastinal lymph nodes, with an aim at investigating the correlation between SN2 and the maximum standardized uptake value (SUVmax) by 18F-FDG PET/CT, Ki67 expression on SN2, and the clinical features of SN2 in patients with different pathological types (i.e., squamous carcinoma or adenocarcinoma).