Romosuzumab used to treat a 29-year-old patient with anorexia nervosa related osteoporosis – A case report

Osteoporosis and decreased bone density is a frequent complication of anorexia nervosa (AN). As of yet, there have been no studies of accomplished treatment of AN-related osteoporosis with romosuzumab, a monoclonal antibody to sclerostin. We report the first case of a premenopausal, 29-year old patient in Switzerland with decreased bone density and osteoporotic fractures due to anorexia nervosa, who completed the treatment with romosuzumab. There was a significant increase in bone mineral density (BMD) after 12 months of therapy. No serious side effects were reported. To date, only bisphosphonates, denosumab and teriparatide have been evaluated in treatment of AN-related osteoporosis in adolescents and premenopausal individuals respectively. Our report demonstrates that romosuzumab might be an alternative treatment option in patients with anorexia nervosa who are at high risk for osteoporotic fractures. To assess the efficacy and safety of romosuzumab in individuals with AN further studies are needed.