PRIMA-1MET?(5291-32-7) reactivates mutant p53, an important tumor suppressor gene, in cancer cells.1?It induces p53-dependent mitochondrial apoptosis?via?activation of caspase-2.2?PRIMA-1MET?showed significant antitumor activity in multiple myeloma?via?activation of p733?and had previously been shown to target p53 family members p63 and p734. Tumor cell death by PRIMA-1MET?has been also shown to be caused by glutathione depletion and induced ROS production in a p53 independent manner.5-7?PRIMA-1MET?probably induces tumor cell death by both reactivating mutant p53 and inhibiting cellular thiol-dependent redox systems.8