These results indicate that EML4-ALK rearrangements are not specific of NSCLC and raise yet unsolved questions about their role in promoting human neoplasms..     ///    "EML4-ALK transcripts were detected in 3/51 (5.9%) of reactive lymphoid tissues and 12/58 (20.7%) of lymphomas of different categories, including follicular lymphoma, diffuse large B-cell lymphoma and Hodgkin's disease. "    ///    We investigated the expression of EML4-ALK mRNA and protein in 51 reactive and 58 neoplastic lymphoid tissues.     ///    The EML4-ALK transcript but not the fusion protein can be expressed in reactive and neoplastic lymphoid tissues..     ///    "Notably, none of these cases expressed the EML4-ALK fusion protein at Western blotting samples and immunohistochemistry."    ///    "Notably, none of these cases expressed the EML4-ALK fusion protein at Western blotting samples and immunohistochemistry. "