CD4 and neoplasm: However, despite the fact that CD4+ T cells appeared in similar amounts in the two tumor types (P=0.7369; Fig. 4E), the immune-suppressive regulatory T cells (Tregs) were more abundant in NS/CT-2A than in ML/CT-2A tumors and this difference reached a high level of statistical significance (38.7±7.5 versus 29.0±7.4% of CD4+ T cells, P=0.0074, respectively; Fig. 4F).