The development of therapeutic cancer vaccines is impacted by immunosuppressive elements in the tumor microenvironment. Most immunogenic cancer proteins are “self,” therefore, peripheral tolerance contributes substantially to tumor immune escape. Transforming growth factor β (TGFβ) actively modulates both inflammation and tolerance induction. Combining vaccination with agents that disarm TGFβ will enhance vaccine efficacy. (Clin Cancer Res 2009;15(21):1–3) (Clin Cancer Res 2009;15(21):6476–8)