PPD has exercised its option to acquire the remaining minority ownership interest of X-Chem, Inc., which will continue to operate as a biotechnology company with its existing staff and management team led by chief executive officer and founder Richard W. Wagner, Ph.D.   PPD acquired a controlling interest in X-Chem in October 2010. Since then, X-Chem has established partnerships with Roche, AstraZeneca, Bayer, Pfizer, and two additional major pharma companies and several biotechnology companies ...