NEW YORK--(BUSINESS WIRE)--Medidata Solutions (NASDAQ: MDSO), a leading global provider of SaaS-based clinical development solutions, today announced that it has entered into a definitive agreement to acquire Clinical Force, a pioneer in providing SaaS-based clinical trial management systems (CTMS), for undisclosed proceeds. The acquisition is subject to various standard closing conditions and is expected to be completed early in Medidata’s fiscal third quarter ending September 30, 2011.