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Available online 27 December 2024
Rhupus syndrome: description of 9 cases with special atenttion to the HLA-DR genotype
Síndrome de rhupus: descripción de 9 casos con especial atención al genotipo HLA-DR
Andrés Pérez Hurtadoa,
Corresponding author
perez_andhur@gva.es

Corresponding author.
, Isabel Martínez Cordellata, Roxana González Mazariob, Elene Grau Garcíaa, José Andrés Román Ivorraa
a Servicio de Reumatología, Hospital Universitario y Politécnico La Fe, Valencia, Spain
b Servicio de Reumatología, Consorcio Hospital General Universitario de Valencia, Valencia, Spain
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Tables (3)
Table 1. Comparison of the results of our study with the variables studied by the authors of the literature consulted.
Table 2. Comparison of HLA-DRs obtained by various authors in patients diagnosed with rhupus, RA and SLE.
Table 3. Relationship between the HLA-DR obtained and the main clinical and analytical manifestations of our patients with rhupus.
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Abstract
Background and objectives

Rhupus is a very rare syndrome of overlapping rheumatoid arthritis and systemic lupus erythematosus, characterized by the presence of erosive polyarthritis associated with symptoms and signs of systemic lupus erythematosus and the presence of high specificity autoantibodies. The analysis of HLA-DR molecules would allow us to genetically characterize patients diagnosed with rhupus, being able to differentiate them from the HLA-DR profile of patients with rheumatoid arthritis and systemic lupus erythematosus.

Materials and methods

Cross-sectional observational study of 9 patients diagnosed with Rhupus in whom the HLA-DR genotype was genetically characterized.

Results

Rhupus is usually more frequent in women with initial diagnosis of RA. The most frequent clinical manifestations are articular and, serologically, ANA, RF and anti-CCP positivity stand out. The most frequent HLA-DR were HLA-DR1, HLA-DR3, HLA-DR4, HLA-DR7 and HLA-DR13.

Conclusions

A higher proportion of HLA-DR1 and DR9 was observed in patients with Rhupus compared to RA and SLE, as well as a lower proportion of HLA-DR2, DR6 and DR8, which would help the early characterization of these patients prior to the overlap diagnosis.

Keywords:
Rhupus syndrome
Overlap syndrome
Rheumatoid arthritis
Systemic lupus erythematosus
HLA-DR
HLA
Resumen
Antecedentes y Objetivos

El Rhupus es un síndrome muy raro de superposición de artritis reumatoide y lupus eritematoso sistémico, caracterizado por la presencia de poliartritis erosiva asociada a síntomas y signos de lupus eritematoso sistémico y la presencia de autoanticuerpos con alta especificidad. El análisis de las moléculas de HLA-DR permitiría caracterizar genéticamente a pacientes diagnosticados de rhupus, pudiendo diferenciarse del perfil HLA-DR de pacientes con artritis reumatoide y con lupus eritematoso sistémico.

Materiales y métodos

Estudio observacional transversal de 9 pacientes con diagnóstico de Rhupus en los que se caracterizó genéticamente el genotipo HLA-DR.

Resultados

El Rhupus suele ser más frecuente en mujeres con diagnóstico inicial de AR. La clínica más frecuente es articular y serológicamente destaca la positividad ANA, FR y anti-CCP. Los HLA-DR con mayor frecuencia fueron el HLA-DR1, HLA-DR3, HLA-DR4, HLA-DR7 y HLA-DR13.

Conclusiones

Se ha observado en pacientes con Rhupus mayor proporción HLA-DR1 y DR9 en comparación con AR y LES, así como una menor proporción de HLA-DR2, DR6 y DR8, lo que ayudaría la caracterización precoz de estos pacientes previamente al diagnóstico de solapamiento.

Palabras clave:
Síndrome de rhupus
Síndrome overlap
Artritis reumatoide
Lupus eritematoso sistémico
HLA-DR
HLA

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