Five out of 7 EGFR mutation-negative patients showed positive results for EML4-ALK gene fusion.     ///    Driver oncogene including EGFR mutation and EML4-ALK fusion gene was identified in 9 of 12 cases (75%).     ///    "Twelve patients with lung adenocarcinoma aged 40 or younger at Juntendo University Urayasu Hospital or Juntendo University Hospital from July 2004 to March 2010 were analyzed for driver oncogene status including EGFR activating mutation, EML4-ALK fusion gene, and K-ras mutation. "