Syndax Pharmaceuticals is a clinical-stage biopharmaceutical company developing an innovative pipeline of cancer therapies. The company's lead product candidate, entinostat, a once-weekly, oral, small molecule, class I HDAC inhibitor, is being evaluated in a Phase 3 combination trial with exemestane for the treatment of advanced HR+, HER2- breast cancer, and has been evaluated in combination with several approved PD-1/PD-(L)1 antagonists.