CD4 and type 1 diabetes mellitus: Recent descriptions of auto-reactive CD4 T cells that have expanded in vitro upon Treg depletion from healthy individuals including those specific for NY-ESO-1, tyrosinase, and GAD65 (a type 1 diabetes-associated autoantigen) support this hypothesis and suggest that Treg modulation may be essential for inducing anti-tumor immunity [20,21].