Mozobil [plerixafor], a drug used for stem cell transplants in patients with the blood cancers non-Hodgkin"s lymphoma and multiple myeloma, has been given approval by the European Commission. Genzyme Corp."s drug is already approved for use in the US. The detection of a virus in the Allston Landing plant which has caused delays in manufacturing the Gaucher disease drug, Cerezyme [imiglucerase], has been a recent challenge for the company.