DDx

After a lifetime of treating her rare bone disease, X-linked hypophosphatemia, a patient is at the end of her rope. Due to a genetic variation of the X chromosome — specifically the PHEX gene — there’s an imbalance of phosphate levels in her body. Because of its domino effect on bone development and mineralization, the patient is in pain, she’s frustrated, and nothing seems to help. So when a clinical trial opportunity presents itself, Dr. Suzanne Jan de Beur, a professor of medicine and the Chief of Endocrinology and Metabolism at the University of Virginia, is unsure the patient will want to participate. While the decision to participate is surprising, the results of the clinical trial are astonishing.