EML4 and lung cancer: Ten patients (13.5%) had driver mutation‐positive lung cancer, which involved the epidermal growth factor receptor (EGFR) gene in seven patients, the echinoderm microtubule‐associated protein‐like 4 anaplastic lymphoma kinase fusion (EML4‐ALK) gene in two patients, and the Kirsten rat sarcoma viral oncogene homolog (KRAS) in one patient.