KIF5B/RET fusion gene analysis in a selected series of cytological specimens of EGFR, KRAS and EML4-ALK wild-type adenocarcinomas of the lung..     ///    "This transforming gene arise from the fusion of KIF5B and the RET proto-oncogene, and it is mutually exclusive with EGFR, KRAS and EML4/ALK alterations. "