TP53 and mature T-cell and NK-cell non-Hodgkin lymphoma: According to REAL classification, p53 protein expression <0.35 U/mL was observed in 6 of the 15 DLBL patients, 3 of the 6 (50%) SLL patients, the 1 (100%) BL patient, 2 of the 6 (33.3%) peripheral T-cell lymphoma (PTCL) patients, 1 of the 3 (33.3%) MCL patients, 3 of the 7 (42.9%) FL patients, and 1 of the 3 AIL patients (Table 2).