Overall, a positive staining for TTF-1 was detected in 49 (17.1%) of the included lung NET, with TTF‐1 positivity in 30 (13.0%) of the low Ki‐67 group of patients and in 19 (34.5%) cases of the high Ki‐67 group. Here, MKI67 is linked to lung neuroendocrine neoplasm.