TP53 and neoplasm: In vivo, an increase of the anti-tumor impacts has been observed when PRIMA-1 was associated to Deazaneplanocin A (a negative regulator of polycomb group actions that inhibits histone methyltransferase activity) in mutant-p53 thyroid cancer xenografts [38], and with 2aG4 (a monoclonal anti-body that binds specifically to the surface of tumor blood vessels and disrupts tumor vasculature) in breast cancer xenografts [28].