Syndax Pharmaceuticals, Inc., a clinical-stage biopharmaceutical company, develops therapies for the treatment of cancer. The company's lead product candidates are entinostat that is in Phase III clinical trials for the treatment of advanced hormone receptor positive (HR+), human epidermal growth factor receptor 2 negative (HER2-) breast cancer; and SNDX-5613 in Phase I/II clinical trial inhibitor that targets the binding interaction of Menin with mixed lineage leukemia-rearranged and acute myeloid leukemia with a mutated nucleophosmin 1. It also develops entinostat with Keytruda (pembrolizumab) in a Phase Ib/II clinical trials for the treatment of non-small cell lung cancer and melanoma or microsatellite stable colorectal carcinoma; and with Tecentriq (atezolizumab) in Phase Ib/II clinical trials to treat patients with HR+ and HER2- metastatic breast cancer. In addition, the company develops SNDX-6352, a monoclonal antibody that blocks the colony stimulating factor 1 that is in Phase