ALK and neoplasm: In logistic regression analysis, age (OR = 0.940, 95% CI: 0.910, 0.972), tumours with the solid-predominant subtype or mucinous lung adenocarcinoma (OR = 7.994, 95% CI: 4.183, 15.278), solid tumours (OR = 0.292, 95% CI: 0.097, 0.878) and lesions without air bronchograms (OR = 0.307, 95% CI: 0.123, 0.767) were significantly associated with ALK positivity (Table 7).