RecruitingPhase 4

DEnosumab for the Treatment of FIbrous Dysplasia/McCune-Albright Syndrome in Adults (DeFiD)

Netherlands82 participantsStarted 2023-06-13

Plain-language summary

Fibrous Dysplasia/McCune-Albright syndrome (FD/MAS) is a rare disease, consisting of the replacement of normal bone tissue with fibrous tissue. FD lesions may be isolated in one or more bones or may be associated with endocrinopathies in McCune-Albright syndrome. Bone lesions constitute of weak bone tissue, leading to higher risk of fractures, pain and decreased quality of life. There is no cure for FD lesions and current therapies failed to soothe patients' complaints or to display any effect on progression of the lesions on imaging. However, the RANKL-inhibitor Denosumab demonstrated encouraging results in mouse models and in off-label clinical use, leading to clinical, biochemical and radiographical improvements. Study's aim is to investigate whether 3-monthly Denosumab will improve the clinical, radiological and biochemical manifestations of FD bone lesions.

Who can participate

Age range18 Years

SexALL

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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion Criteria: * Symptomatic patients with established diagnosis of FD/MAS and closed growth plates(\>18 years) * Pain in the region of an FD localization, not responding to adequate pain treatment and without mechanical component e.g. impending fracture * Pain score from FD lesion for maximum or average pain on VAS ≥ 4 * Increased lesional activity defined as increased bone turnover markers (ALP, P1NP or CTX) or increased activity on Na\[18F\]-PET/CT or bone scintigraphy in at least one lesion * Normal levels of calcium, parathyroid hormone and vitamin D (supplementation is allowed) * Treated hypophosphatemia (defined as \>0.7 at two separate measures) * good dental health (last check within the last 12 months) Exclusion Criteria: * Active pregnancy wish, pregnancy or nursing * Pain not related to FD * Uncontrolled endocrine disease * Untreated vitamin D deficiency, hypocalcemia or hypophosphatemia * Previous use of bisphosphonates or Dmab \< 6 months before inclusion ('6 months wash out') * Previously reported severe side effects on Dmab * Inability to fulfil study requirements * Poor untreated dental health without intention to get treatment * Treatment with other bone influencing drugs, such as high doses corticosteroids

What they're measuring

Denosumab effect on maximal pain score

Timeframe: at baseline, 3 months and after 6 months and in case of open label treatment after 9 and 12 months

Trial details

NCT IDNCT05966064

SponsorNatasha Appelman-Dijkstra

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2027-12

Contact for this trial

Natasha Appelman-Dijkstra, MD, PhD

+31 625301410 n.m.appelman-dijkstra@lumc.nl