Biotechnology US specialty drugmaker Auxilium Pharmaceuticals' (Nasdaq: AUXL) shares fell 7.2% to $18.60 at close of New York trading yesterday, after the company revealed that drugs behemoth Pfizer (NYSE: PFE) has terminated its collaboration agreement for the development, commercialization and supply of the Dupuytren's contracture treatment Xiapex (collagenase clostridium histolyticum), in the European Union and certain other European and Eurasian countries, effective no later than April 24, 2013. 8 November 2012