Prevalence, incidence, healthcare resource utilization and costs of myotubular myopathy patients in England

Date of Approval
Application Number
Technical Summary

Myotubular myopathy (MTM) is an X-linked monogenic disorder characterized by profound skeletal muscle weakness, impaired motor function, severe respiratory failure and death. It is caused by mutations in the MTM1 gene which results in deficiencies in myotubularin and disrupts normal development, maintenance and function of skeletal muscle. It occurs almost entirely in males and in its most severe form 50% of babies will die in their first year of life. Those who survive are likely to be dependent on ventilator support; most patients never achieve ambulation.

There has been limited reporting on the real world epidemiology and management of patients with MTM, in part due to the rarity of the disorder.

This study aims to provide foundational insights on the prevalence, incidence, health care resource use (HCRU), associated costs, and mortality of males with MTM. Cases will be identified using diagnosis codes , and will be described in terms of their patient characteristics and a-priori comorbidities. The prevalence and incidence rate of MTM among the general population of males will be estimated. The HCRU of MTM cases will include a reporting of resource use in primary care, outpatient setting, inpatient setting and A&E. We will estimate associated costs of HCRU. Mortality of MTM cases will also be described.

This is a descriptive study using the most recent 20 years of linked electronic medical records in England.

Health Outcomes to be Measured

MTM cases (for prevalence and incidence calculations); Healthcare resource use including number of GP visits, hospital outpatient visits, inpatient admissions, A&E visits, diagnostic tests, procedures, and length of stay in hospital; Costs for healthcare resource use; All-cause mortality and cause-specific mortality.


Amit Kiran - Chief Investigator - Astellas Pharma Europe Ltd. - UK
Amit Kiran - Corresponding Applicant - Astellas Pharma Europe Ltd. - UK
Asad Khan - Collaborator - Astellas Pharma Europe Ltd. - UK
Bas van der Poel - Collaborator - Astellas Pharma Europe Ltd. - UK
Matthias Stoelzel - Collaborator - Astellas Pharma Europe Ltd. - UK


HES Accident and Emergency;HES Admitted Patient Care;HES Outpatient;ONS Death Registration Data