Clinical trial NCT04295785: Juvenile Autoimmune Necrotizing Myopathies
Official title: Clinical, Paraclinical, Functional Characteristics and Evolution of Juvenile Autoimmune Necrotizing Myopathies in a National Retrospective Cohort
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Immune-Mediated Necrotizing Myopathy
Keywords: Autoimmune necrotizing myopathy
anti-HMGCR antibodies
anti-SRP antibodies
Lead sponsor: Central Hospital, Nancy, France
Sponsor class: OTHER
First posted: 2020-03-05
Enrollment: 10
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: CASE_ONLY
Time perspective: RETROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: AINM histologically proved (i.e. predominant muscle fibers necrosis lesions associated with minimal or absent inflammatory lesions), either anti-SRP or anti-HMGCR antibodies positivity and a disease onset before age 18

Brief summary: Autoimmune necrotizing myopathies (AINM) in adult patients are characterized by severity of muscle damage, presence of necrosis with little inflammation on muscle biopsy and anti-HMGCR or anti-SRP auto-antibodies. Data on AINM in children are currently lacking. The purpose of this study is to specify the characteristics at AINM diagnosis, treatments and evolution of juvenile AINM with anti-HMGCR or anti-SRP antibodies.


Eligibility criteria: Inclusion Criteria:

* AINM histologically proved by predominant muscle fibers necrosis lesions associated with minimal or absent inflammatory lesions
* Either anti-SRP or anti-HMGCR antibodies positivity
* Disease onset before age 18

Exclusion Criteria:

* Seronegative necrotizing myopathies
* Forms compatible with another type of myositis (e.g. dermatomyositis)

Primary outcomes:
measure: Type of muscle involvment
timeFrame: At diagnosis
measure: Type of cutaneous involvment
timeFrame: At diagnosis
measure: Other clinical manifestations
timeFrame: At diagnosis
measure: Blood CK level
timeFrame: At diagnosis
measure: Histology
timeFrame: At diagnosis
measure: Histology
timeFrame: At diagnosis
measure: MMT score
timeFrame: At diagnosis
measure: CMAS score
timeFrame: At diagnosis
Secondary outcomes:
measure: Type of drugs used
timeFrame: At last visit
measure: Iatrogenic complications
timeFrame: At last visit
measure: Iatrogenic complications
timeFrame: At last visit
measure: Status of the disease at last visit
timeFrame: At last visit
measure: Number of relapses
timeFrame: At last visit
measure: Type of muscle involvment
timeFrame: At last visit
measure: Type of cutaneous involvment
timeFrame: At last visit
measure: Other clinical manifestations
timeFrame: At last visit
measure: Blood CK level
timeFrame: At last visit
measure: CMAS score
timeFrame: At last visit
measure: MMT score
timeFrame: At last visit
Other outcomes:
Locations:
city: Vandœuvre-lès-Nancy
country: France
facility: Hopital d'enfants CHRU Nancy
Study officials:
References:
citation: Benveniste O, Stenzel W, Allenbach Y. Advances in serological diagnostics of inflammatory myopathies. Curr Opin Neurol. 2016 Oct;29(5):662-73. doi: 10.1097/WCO.0000000000000376.
citation: Mariampillai K, Granger B, Amelin D, Guiguet M, Hachulla E, Maurier F, Meyer A, Tohme A, Charuel JL, Musset L, Allenbach Y, Benveniste O. Development of a New Classification System for Idiopathic Inflammatory Myopathies Based on Clinical Manifestations and Myositis-Specific Autoantibodies. JAMA Neurol. 2018 Dec 1;75(12):1528-1537. doi: 10.1001/jamaneurol.2018.2598.
citation: Watanabe Y, Uruha A, Suzuki S, Nakahara J, Hamanaka K, Takayama K, Suzuki N, Nishino I. Clinical features and prognosis in anti-SRP and anti-HMGCR necrotising myopathy. J Neurol Neurosurg Psychiatry. 2016 Oct;87(10):1038-44. doi: 10.1136/jnnp-2016-313166. Epub 2016 May 4.
citation: Allenbach Y, Drouot L, Rigolet A, Charuel JL, Jouen F, Romero NB, Maisonobe T, Dubourg O, Behin A, Laforet P, Stojkovic T, Eymard B, Costedoat-Chalumeau N, Campana-Salort E, Tournadre A, Musset L, Bader-Meunier B, Kone-Paut I, Sibilia J, Servais L, Fain O, Larroche C, Diot E, Terrier B, De Paz R, Dossier A, Menard D, Morati C, Roux M, Ferrer X, Martinet J, Besnard S, Bellance R, Cacoub P, Arnaud L, Grosbois B, Herson S, Boyer O, Benveniste O; French Myositis Network. Anti-HMGCR autoantibodies in European patients with autoimmune necrotizing myopathies: inconstant exposure to statin. Medicine (Baltimore). 2014 May;93(3):150-157. doi: 10.1097/MD.0000000000000028.
citation: Anti-HMGCR Autoantibodies in Juvenile Idiopathic Inflammatory Myopathies Identify a Rare but Clinically Important Subset of Patients. J Rheumatol. 2017 Sep;44(9):1417. doi: 10.3899/jrheum.160871.C1. No abstract available.
citation: Liang WC, Uruha A, Suzuki S, Murakami N, Takeshita E, Chen WZ, Jong YJ, Endo Y, Komaki H, Fujii T, Kawano Y, Mori-Yoshimura M, Oya Y, Xi J, Zhu W, Zhao C, Watanabe Y, Ikemoto K, Nishikawa A, Hamanaka K, Mitsuhashi S, Suzuki N, Nishino I. Pediatric necrotizing myopathy associated with anti-3-hydroxy-3-methylglutaryl-coenzyme A reductase antibodies. Rheumatology (Oxford). 2017 Feb;56(2):287-293. doi: 10.1093/rheumatology/kew386. Epub 2016 Nov 6.
citation: Tiniakou E, Pinal-Fernandez I, Lloyd TE, Albayda J, Paik J, Werner JL, Parks CA, Casciola-Rosen L, Christopher-Stine L, Mammen AL. More severe disease and slower recovery in younger patients with anti-3-hydroxy-3-methylglutaryl-coenzyme A reductase-associated autoimmune myopathy. Rheumatology (Oxford). 2017 May 1;56(5):787-794. doi: 10.1093/rheumatology/kew470.
citation: Binns EL, Moraitis E, Maillard S, Tansley S, McHugh N, Jacques TS, Wedderburn LR, Pilkington C, Yasin SA, Nistala K; UK Juvenile Dermatomyositis Research Group (UK and Ireland). Effective induction therapy for anti-SRP associated myositis in childhood: A small case series and review of the literature. Pediatr Rheumatol Online J. 2017 Oct 31;15(1):77. doi: 10.1186/s12969-017-0205-x.