CAMBRIDGE, Mass.--(BUSINESS WIRE)--Genzyme Corporation (NASDAQ: GENZ) announced today that it has entered into an agreement with Goldman, Sachs & Co. to repurchase $1 billion of Genzyme common stock under an accelerated stock repurchase program. Proceeds from its recently concluded debt offering will be used to support this first tranche of Genzyme’s overall $2 billion share repurchase plan announced in May.