Epigenetic Regulation in Fibrous Dysplasia of Bone: mirDYS Study.

Not Applicable

Recruiting

• Conditions: Fibrous Dysplasia of Bone
• Interventions: Other: Blood sample; Other: Waste bone tissue

• Registration Number: NCT03838991
• Lead Sponsor: Hospices Civils de Lyon

Brief Summary

Fibrous dysplasia of bone is a rare congenital but non-hereditary disease caused by a post-zygotic activation mutation of the GNAS gene. Patients with fibrous dysplasia may present pain and bone complications (fractures, deformities..) related to their bone lesions.

For undetermined reasons, severity and disease evolution may vary considerably from patient to patient.

Epigenetic regulation could then be involved, including micro Ribonucleic Acids (miRs).

These small non-coding micro Ribonucleic Acids are involved in the regulation of major steps of cellular processes in different pathologies, in particular in bone diseases. However, micro Ribonucleic Acids have never been studied in fibrous dysplasia.

The aim of this study is to identify micro Ribonucleic Acids significantly associated with the severity of fibrous dysplasia.

Detailed Description

Not available

Study Timeline

• Study Start: 2019-01-10
• Study First Submitted: 2019-02-06
• Study First Submitted QC: 2019-02-11
• Study First Posted: 2019-02-12
• Status Verified: 2023-01
• Last Update Submitted: 2023-01-03
• Last Update Posted: 2023-01-04
• Primary Completion: 2025-02-10
• Study Completion: 2025-02-10

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 29

Inclusion Criteria

Control population :

• men and women,
• 18 years-old and over,
• consulting a rheumatologist or an orthopedist for arthrosis
• have scheduled surgery for hip or knee replacement surgery or any intervention involving the lower limb or upper limb.

Patients with Fibrous dysplasia:

• men and women,
• 18 years-old and over,
• with a diagnosis of fibrous dysplasia previously established by a rheumatologist.

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Exclusion Criteria

• Refusal to participate in the study
• Long- term corticosteroids treatment (> 3 months)
• Treated osteoporosis
• Chronic inflammatory rheumatism (rheumatoid arthritis, psoriasic arthritis, spondyloarthropathy)
• Collagen disease (osteogenesis imperfecta...)
• Paget's disease, benign bone tumors
• Uncontrolled hypo/hyper-thyroidism, hypo/hyper-parathryoidism
• Severe renal impairment (GFR < 30 ml/min/1.73m2)
• Cancer or bone metastases (current or in the past two years)
• Paget disease, benign bone tumor (osteoid osteoma, enchondroma ...)
• Malabsorptive disease (Celiac disease, Whipple's disease, intestinal bypass, short bowel syndrome) and inflammatory bowel disease
• Pregnant women or lactating
• Psychiatric disorders
• Difficulty in understanding French
• Not a beneficiary of french social security
• Patients protected by law

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Polyostotic fibrous dysplasia	Waste bone tissue	Patients with polyostotic Fibrous dysplasia.
Monostotic fibrous dysplasia	Blood sample	Patients with monostotic Fibrous dysplasia.
Monostotic fibrous dysplasia	Waste bone tissue	Patients with monostotic Fibrous dysplasia.
Controls	Blood sample	Control patients having a scheduled surgery for osteoarthritis.
Controls	Waste bone tissue	Control patients having a scheduled surgery for osteoarthritis.
Polyostotic fibrous dysplasia	Blood sample	Patients with polyostotic Fibrous dysplasia.

Primary Outcome Measures

Name	Time	Method
Evaluation of micro Ribonucleic acids expression in the serum	At inclusion	The objective is to identify specific microRibonucleic acids expressed in serum of patients using NGS (Next Generation Sequencing).
Evaluation of micro Ribonucleic acids expression in the bone tissue	At inclusion	The objective is to identify specific micro Ribonucleic acids expressed in bone tissue obtained from surgery (patients having a scheduled surgery for osteoarthritis or fibrous dysplasia) using NGS (Next Generation Sequencing)

Secondary Outcome Measures

Name	Time	Method
Comparison of micro Ribonucleic acids expression	Time of realization of the analyzes, an average of 6 months	The objective is to compare nature and level of expression of the micro Ribonucleic acids identify by NGS (Next Generation Sequencing) in bone tissue and serum between the 3 groups of subjects: monostotic Fibrous Dysplasia, polyostotic Fibrous Dysplasia and controls (controls are patients with osteoarthritis).
Validation of micro Ribonucleic acids identified by NGS (Next Generation Sequencing) in blood samples	Time of realization of the analyzes, an average of 6 months	The objective is to validate expression of micro Ribonucleic acids identified by NGS (Next Generation Sequencing) in blood samples of patients from 4 pre-existing cohorts : a fibrous dysplasia cohort (PERIOSDYS) and 3 cohorts of control patients (OFELY and MODAM for women, STRAMBO for men).; For that the expression of the significant micro Ribonucleic acids identified by NGS (Next Generation Sequencing) in sera of patients with monostotic and polyostotic fibrous dysplasia versus control patients will be measured by RT-qPCR (Reverse Transcription Quantitative Polymerase Chain Reaction) and then these results will be compared with same analysis on blood samples of patients from the 4 pre-existing cohorts.
Association between micro Ribonucleic acids and severity of fibrous dysplasia.	Time of realization of the analyzes, an average of 6 months	Association between expression of significant micro Ribonucleic acids in patients with fibrous dysplasia with the severity of the disease will be studied by statistics analysis.; Severity of fibrous dysplasia will be evaluated with clinical, biological and radiological data extracted from patients' medical records (Easily software) and from the CEMARA database (fibrous dysplasia database).

Trial Locations

Locations (1)

Service de Rhumatologie & INSERM U1033, Pavillon F, Hopital Edouard Herriot; 🇫🇷 Lyon, France