Twenty-six patients continued to be treated with ELELYSO in an extension of this study in a blinded manner for a total treatment duration of 24 months. The data demonstrated continued improvement in the clinical parameters.In a study of 25 patients with Type 1 Gaucher disease who were switched from imiglucerase to ELELYSO, the safety and efficacy of ELELYSO was assessed. The trial was a nine-month, multi-center, open-label, single arm study in patients who had been receiving treatment with imiglucerase at doses ranging from 11 Units/kg to 60 Units/kg for a minimum of 2 years. Imiglucerase therapy was stopped, and treatment with ELELYSO was administered every other week at the same number of units as each patient’s previous imiglucerase dose. Organ volumes and hematologic values remained stable on average through nine months of ELELYSO treatment. The most common adverse reactions during clinical studies were infusion reactions. Other commonly observed adverse reactions in less than ten percent of patients were URTI/nasopharyngitis, pharyngitis/throat infection, headache, arthralgia, influenza/flu, UTI/pyelonephritis, back pain and extremity pain. “The clinical trials for ELELYSO™ demonstrate that it is an effective enzyme replacement therapy for Gaucher disease. Patients and physicians now have an additional treatment option, coupled with a patient assistance program focused on auxiliary services,” said Gregory M. Pastores, MD, associate professor of Neurology and Pediatrics at the New York University School of Medicine. Safety Information for ELELYSO™ As with any intravenous protein product, allergic reactions, some severe, were reported in the taliglucerase alfa clinical trials. A definition of anaphylaxis (as defined by Sampson et al 2006) was retrospectively applied to some of these reports. In patients who have experienced anaphylaxis during infusion with ELELYSO or with other ERT, caution should be exercised upon retreatment; appropriate medical support should be readily available. Infusion reactions (including allergic reactions), defined as a reaction occurring within 24 hours of the infusion, were the most commonly observed reactions in patients treated with ELELYSO in clinical studies. The most commonly observed symptoms of infusion reactions were headache, chest pain or discomfort, asthenia, fatigue, urticaria, erythema, increased blood pressure, back pain and arthralgia, and flushing. Most of these reactions were mild and did not require treatment intervention.