Studies have demonstrated that EGCG inhibits CDK activity via induction of the CDK inhibitor CDKN1A/p21 (hereafter p21) and p27 expression [6], while resveratrol induces cell cycle arrest at the S-G2 phase transition via the overexpression of cyclins A and E without p21 expression in HL60 leukemia cells [7]. Here, CDKN1A is linked to leukemia.