In a study of US patients, Holst et al. [58] (Table 2) analysed 10 primary tumours and corresponding intrathoracic metastases of patients with the bronchioloalveolar adenocarcinoma NSCLC subtype, and found a KRAS mutation status concordance of 100 % (10/10). Here, KRAS is linked to non-small cell lung carcinoma.