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In the phase 3 Study of Eliglustat Tartrate (Genz-112638) in Patients With Gaucher Disease Who Have Reached Therapeutic Goals With Enzyme Replacement Therapy (ENCORE), at 1 year, eliglustat was noninferior to imiglucerase enzyme therapy in maintaining stable platelet counts, hemoglobin concentrations, and spleen and liver volumes. After this primary analysis period, patients entered a long-term extension phase in which all received eliglustat. Duration on eliglustat ranged from 2 to 5 years, depending on timing of enrollment (which spanned 2 years), treatment group to which patients were randomized, and whether they lived in the United States when commercial eliglustat became available. Here we report long-term safety and efficacy of eliglustat for 157 patients who received eliglustat in the ENCORE trial; data are available for 46 patients who received eliglustat for 4 years. Mean hemoglobin concentration, platelet count, and spleen and liver volumes remained stable for up to 4 years. Year to year, all 4 measures remained collectively stable (composite end point relative to baseline values) in ≥85% of patients as well as individually in ≥92%. Mean bone mineral density z scores (lumbar spine and femur) remained stable and were maintained in the healthy reference range throughout. Eliglustat was well tolerated over 4 years; 4 (2.5%) patients withdrew because of adverse events that were considered related to the study drug. No new or long-term safety concerns were identified. Clinical stability assessed by composite and individual measures was maintained in adults with Gaucher disease type 1 treated with eliglustat who remained in the ENCORE trial for up to 4 years. This trial was registered at www.clinicaltrials.gov as #NCT00943111.

In the phase 3 Study of Eliglustat Tartrate (Genz-112638) in Patients With Gaucher Disease Who Have Reached Therapeutic Goals With Enzyme Replacement Therapy (ENCORE), at 1 year, eliglustat was noninferior to imiglucerase enzyme therapy in maintaining stable platelet counts, hemoglobin concentrations, and spleen and liver volumes. After this primary analysis period, patients entered a long-term extension phase in which all received eliglustat. Duration on eliglustat ranged from 2 to 5 years, depending on timing of enrollment (which spanned 2 years), treatment group to which patients were randomized, and whether they lived in the United States when commercial eliglustat became available. Here we report long-term safety and efficacy of eliglustat for 157 patients who received eliglustat in the ENCORE trial; data are available for 46 patients who received eliglustat for 4 years. Mean hemoglobin concentration, platelet count, and spleen and liver volumes remained stable for up to 4 years. Year to year, all 4 measures remained collectively stable (composite end point relative to baseline values) in ≥85% of patients as well as individually in ≥92%. Mean bone mineral density z scores (lumbar spine and femur) remained stable and were maintained in the healthy reference range throughout. Eliglustat was well tolerated over 4 years; 4 (2.5%) patients withdrew because of adverse events that were considered related to the study drug. No new or long-term safety concerns were identified. Clinical stability assessed by composite and individual measures was maintained in adults with Gaucher disease type 1 treated with eliglustat who remained in the ENCORE trial for up to 4 years. This trial was registered at www.clinicaltrials.govas #NCT00943111.

Peterschmitt: Sanofi Genzyme: Employment. Freisens:Sanofi Genzyme: Employment. Hou:Sanofi Genzyme: Employment. Underhill:Sanofi Genzyme: Employment. Foster:Sanofi Genzyme: Employment. Gaemers:Sanofi Genzyme: Employment.

Mistry: Sanofi Genzyme: Honoraria, Other: Principal Investigator for the eliglustat ENGAGE and ENCORE trials; ReceivedTravel Reimbursement; Member of the ICCG North American Advisory Board; , Research Funding. Charrow:Sanofi Genzyme: Honoraria, Other: Principal investigator, eliglustat EDGE trial; Member of advisory boards, Research Funding. Cox:Sanofi Genzyme: Honoraria, Other: Principal investigator for the eliglustat ENCORE trial; received travel reimbursement, Research Funding. Lukina:Sanofi Genzyme: Honoraria, Other: Principal investigator in the eliglustat Phase 2, ENGAGE, ENCORE, and EDGE trials; receives travel reimbursement; member of advisory boards, Research Funding. Marinakis:Sanofi Genzyme: Other: Principal investigator for the eliglustat EDGE trial, Research Funding. Foster:Sanofi Genzyme: Employment. Gaemers:Sanofi Genzyme: Employment. Peterschmitt:Sanofi Genzyme: Employment.

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Weinreb: Genzyme, a Sanofi company: Consultancy, Honoraria, Other: Grant Support, Speakers Bureau; Shire: Consultancy, Honoraria, Speakers Bureau; Pfizer: Consultancy, Honoraria, Speakers Bureau. Cox:Genzyme, a Sanofi company: Consultancy, Honoraria, Other: Grant Support, Speakers Bureau; Shire: Consultancy, Honoraria, Other: Grant support, Speakers Bureau; Actelion: Consultancy, Honoraria, Speakers Bureau. Lukina:Shire: Honoraria, Other: Travel Reimbursement; Genzyme, a Sanofi company: Honoraria, Other: Travel Reimbursement. Mistry:Genzyme, a Sanofi company: Consultancy, Honoraria, Other: Grant Support, Speakers Bureau; Shire: Consultancy, Honoraria, Other: Grant Support, Speakers Bureau; Pfizer: Consultancy, Honoraria, Speakers Bureau; Synageva: Honoraria, Speakers Bureau; NIH NIMS: Other: Grant Support. Angell:Genzyme, a Sanofi company: Employment. Gaemers:Genzyme, a Sanofi company: Employment. Peterschmitt:Genzyme, a Sanofi company: Employment.