EML4 and lung adenocarcinoma: Since the fusion of echinoderm microtubule-associated protein like-4 (EML4)−anaplastic lymphoma kinase (ALK) was discovered in non-small cell lung cancer (NSCLC), ALK rearrangements have been reported in 3–8% of lung adenocarcinomas (Soda et al., 2007; Mano, 2008; Devarakonda et al., 2015).