Plain language summary of a study looking at the long-term benefits of enzyme replacement therapy in children and teenagers with Gaucher disease type 3

Gaucher disease is a rare genetic condition. There are three types of Gaucher disease: type 1, type 2, and type 3 (GD3). Symptoms of GD3 include problems with the brain and spinal cord, bones, blood, enlarged liver and spleen, and slow growth. Symptoms have a great impact on the quality of life of people with GD3 and are known to cause loss of life in childhood. In Gaucher disease, people have two non-working copies of a gene called GBA, which tells the body how to make an enzyme called beta-glucosidase (which breaks down excess fats called sphingolipids). In Gaucher disease, people do not make enough beta-glucosidase enzyme, meaning sphingolipids build up inside cells, affecting many organs and systems of the body. Enzyme replacement therapy (ERT) is a treatment for Gaucher disease. Previous studies looking at ERT showed that treatment can greatly improve most symptoms and quality of life in people with Gaucher disease. How ERT may help people with GD3 is only available in small studies. Researchers looked at long-term changes in the blood, spleen, liver, and growth in children and teenagers living with GD3 and how long they survived once they had started an ERT called imiglucerase. Researchers used data from a large global database called the International Collaborative Gaucher Group (ICGG) Gaucher Registry. The aim was to investigate if imiglucerase could improve long-term symptoms and prevent early loss of life. Low red blood cell counts (causing a condition called anaemia), low platelet (specialised blood cells that stop bleeding and bruising) counts, enlarged liver and spleen, and slow growth were the most common symptoms in people with GD3 before treatment. People with GD3 who had received imiglucerase had improved symptoms after 5 years of treatment. They also had a greater chance of living longer, with 92% of people alive after 5 years of treatment. These results show that the ERT imiglucerase helps to improve blood, spleen, liver, and growth symptoms, and most importantly that it is a life-prolonging treatment.