The predictive value of the HLA shared epitope for severity of radiological joint damage in patients with rheumatoid arthritis. A 10 year observational prospective study.
OBJECTIVE
To evaluate the clinical importance of the RA "shared epitope" (SE) as a prognostic marker of radiological severity and extension of the disease to large joints in patients with rheumatoid arthritis (RA).


METHODS
Eighty-two patients who met the American College of Rheumatology criteria for RA with a disease duration < 2 years at presentation were included in the study. Radiographs of hands, wrists, feet, shoulders, elbows, hips, and knees were taken at study entry and 8-10 years later. HLA-DRB1 genotypes were determined by polymerase chain reaction-sequence-specific oligonucleotide probes. Radiological severity was assessed in small joints of hands, wrists, and feet. Extension of the disease to large joints was evaluated in radiographs of shoulders, elbows, hips, and knees.


RESULTS
At the end of the study, erythrocyte sedimentation rate (ESR), rheumatoid factor (RF) titer, and percentage of maximum radiological score at baseline were significantly associated with RA severity (p < 0.01, p < 0.01, p < 0.05, respectively). Extension of RA to large joints was related to a higher ESR (p < 0.001) and a lower hemoglobin level (p < 0.01) at baseline. Neither at entry nor at the end of the study was the RA shared epitope predictive for radiologic severity or extension of disease to large joints (p = 0.8, p = 0.3, respectively).


CONCLUSIONS
Presence of the SE in patients with RA is not a good prognostic marker of radiological severity after a mean followup period of 9 years.
Valenzuela-Castaño
A
A
Rheumatology Service, Hospital Universitario Virgen del Rocio, Seville, Spain.
García-López
A
A
Pérez-Vilches
D
D
Rodriguez-Pérez
R
R
Gonzalez-Escribano
M F
MF
Núñez-Roldán
A
A
D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D000328:Adult; D018501:Antirheumatic Agents / Q000627:therapeutic use; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000276:immunology*; D001175:Arthrography; D000939:Epitopes; D005260:Female; D006680:HLA Antigens / Q000276:immunology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome
D000305:Adrenal Cortex Hormones; D018501:Antirheumatic Agents; D000939:Epitopes; D006680:HLA Antigens