Effectiveness of enzyme replacement therapy in 1028 patients with type 1 Gaucher disease after 2 to 5 years of treatment: a report from the Gaucher Registry.
OBJECTIVE
Gaucher disease is the first lysosomal storage disorder to be treated with macrophage-targeted enzyme replacement therapy. Previous studies in relatively small numbers of patients demonstrated short-term efficacy of this treatment. This study describes the effects of 2 to 5 years of treatment on specific manifestations of type 1 Gaucher disease.


METHODS
Physicians reported data from 1028 patients to the Gaucher Registry. Assessment of response included serial measurements of hemoglobin concentration, platelet count, liver and spleen volumes, and the occurrence of bone pain and bone crises.


RESULTS
Among anemic patients, hemoglobin concentration increased to normal or near normal within 6 to 12 months, with a sustained response through 5 years. In thrombocytopenic patients with intact spleens, the most rapid response occurred during the first 2 years, with slower improvement thereafter. The likelihood of achieving a normal platelet count decreased with increasing severity of baseline thrombocytopenia. In patients who had undergone splenectomy, platelet counts returned to normal within 6 to 12 months. Hepatomegaly decreased by 30% to 40% during follow-up; splenomegaly decreased 50% to 60%, but rarely to volumes below five times normal size. In patients with pretreatment bone pain or bone crises, 52% (67/128) were pain free after 2 years and 94% (48/51) reported no additional crises.


CONCLUSIONS
Enzyme replacement therapy prevents progressive manifestations of Gaucher disease, and ameliorates Gaucher disease-associated anemia, thrombocytopenia, organomegaly, bone pain, and bone crises.
Weinreb
Neal J
NJ
Department of Medicine, University Hospital, Tamarac, Florida 33321, USA. boneal@winning.com
Charrow
Joel
J
Andersson
Hans C
HC
Kaplan
Paige
P
Kolodny
Edwin H
EH
Mistry
Pramod
P
Pastores
Gregory
G
Rosenbloom
Barry E
BE
Scott
C Ronald
CR
Wappner
Rebecca S
RS
Zimran
Ari
A
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005260:Female; D005500:Follow-Up Studies; D005776:Gaucher Disease / Q000175:diagnosis / Q000188:drug therapy*; D005962:Glucosylceramidase / Q000008:administration & dosage* / Q000009:adverse effects; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007262:Infusions, Intravenous; D008099:Liver / Q000187:drug effects; D008297:Male; D010147:Pain Measurement; D010976:Platelet Count; D012042:Registries; D018570:Risk Assessment; D013154:Spleen / Q000187:drug effects; D018709:Statistics, Nonparametric; D013997:Time Factors; D016896:Treatment Outcome
D006454:Hemoglobins; C070292:alglucerase; D005962:Glucosylceramidase; C090568:imiglucerase