The company that makes Zavesca will complete the following studies to address the product’ s effectiveness and safety in type 1 Gaucher disease:  a post-marketing plan to inform doctors on how to use Zavesca and to get patients to report information on the safety of the medicine;  a study to follow up patients already in clinical trials, to continue assessment of the medicine’ s safety and effectiveness and to find out more about the neurological aspects of the disease;  a study to look at the effectiveness and safety of Zavesca in patients who switch from ERT;  a further study of the natural history of the disease, together with the European Working Group for Gaucher Disease (EWGGD).