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Among the 37 cases of AITL and PTCL-TFH investigated, RHOA Gly17Val was detected in 62.2% (23/37) of which 19 had multiple biopsies including preceding biopsies in 10 and follow up biopsies in 11 cases. RHOA Gly17Val was present in each of these preceding or follow up biopsies including 18 specimens that showed no evidence of lymphoma by combined histological, immunophenotypic and clonality analyses. The mutation was seen in biopsies 0-26.5 months (mean=7.87 months) prior to lymphoma diagnosis. Our results show that RHOA Gly17Val mutation analysis is valuab