First long-term results of imiglucerase therapy of type 1 Gaucher disease

In the early 1990s, enzyme replacement therapy with modified placental glucocerebrosidase (alglucerase, Genzyme Corporation, Cambridge, MA, USA) was shown to arrest or reverse complications and to improve quality of life in patients with type 1 Gaucher's disease. More recently, modified recombinant glucocerebrosidase (imiglucerase, Genzyme Corporation) has been shown to be safe, effective and clinically equivalent to alglucerase by two studies which presented data for 12 months' follow-up. This case report, with 30 months' follow-up, represents the first publication of long-term results of imiglucerase therapy of type 1 Gaucher's disease in Europe.

Retrospective analysis of safety and efficacy of 30 months' imiglucerase infusions, 40 U/kg body weight every 2 weeks for 17 months, then 60 U/kg every 2 weeks for 13 months, in an elderly male patient with severe type 1 Gaucher's disease.

No adverse reactions occurred, and anti-imiglucerase antibody assay was negative at 17 months. Clinically, the patient responded rapidly and markedly. Within several months, bone pain decreased notably, enabling him to abandon crutches. Abdominal pain abated, fatigue decreased and physical fitness and general well-being improved. Nosebleeds and haematomas ceased. Dosage increase massively reduced hepatosplenomegaly and produced much greater improvement in laboratory values, especially platelet count. Bone pain diminished further, so that this formerly disabled patient now walks and climbs stairs without complains. Also of note, aminotransferases, gamma-GT, total protein, and prothrombine time improved, suggesting improvement of liver function.

This case documents long-term safety and efficacy of recombinant enzyme replacement in type 1 Gaucher's disease.