T-cell composition is skewed toward CD4⁺CD45RO⁺ T cells in FL LN biopsies. Immunophenotypic analysis of the lymphoma patient specimens. Shown is scatter plot of percentage positive cells of total CD3⁺ T cells in the tumor sample of (A) CD4⁺ T cells, (B) CD4⁺CD45RO⁺ memory T cells, and (C) FoxP3⁺CD25⁺CD4⁺ T regulatory cells. DLBCL, n = 12 (n = 4 for FoxP3); MCL, n = 19; FL, n = 14; CLL, n = 14; and tonsil, n = 4. Significance between groups was determined by unpaired Mann-Whitney U test.