PSME3 and Burkitt lymphoma: The studied groups of lymphomas were further separated into a “clinically indolent lymphomas” group (MALT and MCL classical type with ki-67 ≤ 30%) and a “clinically aggressive lymphomas” group (high-grade B-cell lymphomas, Burkitt lymphoma, unclassifiable B-cell lymphoma, mixed B-cell lymphoma and mantle cell lymphoma with ki-67 > 30%).