IL4 and B-cell non-Hodgkin lymphoma: As showed in Figure 3B, CD4+FoxP3+ T cells from involved lymphatic tissues of patients with B-cell NHL (n = 4; patients 6, 7, 13, and 18) were unable to produce IL-2, IFN-γ, IL-4 and IL-17 in response to strong PMA/ionomycin stimulation.