Rein Therapeutics, Inc. is a clinical stage biopharmaceutical company, which engages in the development and commercialization of a novel class of therapeutics for the treatment of cancer and other diseases. It focuses on its lead product candidate, ALRN-6924, which is a cell-permeating peptide that disrupts the interaction of p53 suppressors MDM2 and MDMX with tumor suppressor p53 to reactivate tumor suppression in non-mutant, or wild-type, p53 cancers. The company was founded by Gregory L.