Multicenter Prospective Observational Study Assessing Outcomes, Adverse Events, Treatment Patterns and Related Costs in Patients Diagnosed With Bullous Pemphigoid

Bullous pemphigoid is the most common autoimmune blistering disease of the skin, usually affecting the elderly. It is a chronic disease characterized by spontaneous exacerbations and remissions. Bullous pemphigoid is mediated by IgG autoantibodies directed against hemidesmosomal proteins (BP180, BP230), which are involved in dermal-epidermal adhesion in the skin. The diagnosis of bullous pemphigoid is based on clinical and immunopathological findings, including skin direct immunofluorescence. The disease usually requires on average a 1-year duration of treatment although a long-term maintenance therapy may be necessary some cases. High doses oral corticosteroids have been considered as the mainstay of treatment for many years, but are deleterious, with a high rate of treatment side effects, including mortality. Topical superpotent corticosteroids have been demonstrated to be as effective but safer than high doses of oral corticosteroids, reducing side effects and mortality rate, while controlling the disease in between 95% to 100% of cases. Despite its high efficacy, topical superpotent corticosteroid therapy is often considered as poorly convenient. In addition, immunosuppressant drugs and methotrexate are poorly tolerated or frequently contra-indicated in those elderly patients with bullous pemphigoid. To date, no study has evaluated the real-world use and costs of the different treatments in this disease.

Purpose The project is an observational, multi-center, prospective, non-interventional and open-label data collection study assessing outcomes, adverse events, treatment patterns and related costs in patients diagnosed with bullous pemphigoid. The patient enrollment period will be 1 year with a follow-up (observation period) of 1 year for each patient. Four dermatology centres in France will participate.

Primary objective:

The specific goal is to describe in each patient with bullous pemphigoid the therapeutic management, including: i) all topical and systemic medications and nursing cares; ii) clinical and biological monitoring and iii) clinical outcome during the first year of treatment. The hypothesis to be answered by the study is that topical superpotent corticosteroid therapy is properly used to treat bullous pemphigoid in real-world life as recommended by French guidelines and whether this treatment influences the medical costs by comparison with systemic therapies (e.g. methotrexate or prednisone).

Secondary objectives: