TBX21 and mature T-cell and NK-cell non-Hodgkin lymphoma: Compared to PTCL‐TBX21, PTCL‐unclassified was significantly lower age (p = 0.049), had lower elevated LDH levels (p = 0.035), lower CD8 expression (p = 0.008), and smaller large cell size (p = 0.003).