FYN and mature T-cell and NK-cell non-Hodgkin lymphoma: To validate the importance of these fusion genes, we tested the presence of the FYN-TRAF3IP2 and the KHDRBS1-LCK fusion genes with RT-PCR in an independent validation cohort of 37 PTCL cases (30 PTCL-NOS, 6 PTCL-TFH, 1 Adult T-cell leukemia/lymphoma (ATLL)).