FOXG1 and mature T-cell and NK-cell non-Hodgkin lymphoma: As mentioned above, PTCL/NOS usually carry phenotypic aberrations, the exact prevalence and spectrum of which have remained unresolved.8, 11, 25, 28 In 2006, we reported PTCL from 193 Italian patients (148 NOS and 45 AITL) that had been collected on tissue microarrays and tested by immunohistochemistry and Epstein–Barr virus encoded RNA 1 (EBER1) and EBER2 in situ hybridisation.27 The βF1 antibody (raised against the T cell receptor β chain) reacted with 96% of tumours.