Syndax Pharmaceuticals has filed for an IPO. The number of shares that will be offered as well as the stock’s pricing terms have yet to be set. Deutsche Bank Securities and Jefferies are serving as lead underwriters. Headquartered in Waltham, Mass., Syndax is a Syndax Pharmaceuticals is a developer of epigenetic therapies for treatment-resistant cancers. Its backers include Domain Associates, MPM Capital, Forward Ventures, Pappas Ventures and Avalon Ventures.