RHOA and mature T-cell and NK-cell non-Hodgkin lymphoma: The mutational landscape of PTCL is also becoming clearer: a point mutation causes the replacement of glycine by valine at residue 17 of RHOA in 60 to 70% of cases of AITL and about 20% of PTCL-NOS suggesting a new biologically based category of Tfh lymphoma.