Description_x000D_ Packaging_x000D_ 5, 25 mg in glass bottle_x000D_ Biochem/physiol Actions_x000D_ RETRA is a mutant p53-dependent activator of p73, an activator of p53-regulated genes, and a suppressor of mutant p53-bearing tumor cells. Greater than 50% of tumors express mutant p53 which is defective for the tumor-suppressor function and contributes to malignancy by blocking a p53 family member p73. Activation of p73 in human cancer produces a cytotoxic effect. RETRA increases expression level of p73 and releases p73 from the inhibitory complex with mutant 53. It thereby produces tumor-supressor effect, in vitro and in vivo, similar to functional reactivation of p53.