CAMBRIDGE, Mass.--(BUSINESS WIRE)--Verastem, Inc., (NASDAQ: VSTM) a biopharmaceutical company focused on discovering and developing drugs to treat breast and other cancers by targeting cancer stem cells, announced a research collaboration with Eisai for the next-generation of small molecule Wnt inhibitors. Verastem scientific co-founder and chair of the Scientific Advisory Board, Robert Weinberg, Ph.D., published a report in 2011 in the journal Cell describing the critical nature of the Wnt pathway in the development and maintenance of cancer stem cells.