HLA-DMA*0103 and HLA-DMB*0104 alleles as novel prognostic factors in rheumatoid arthritis.

OBJECTIVE: To evaluate HLA-DM alleles as markers for disease severity in rheumatoid arthritis (RA). METHODS: Two distinct cohorts of patients with RA were oligotyped for HLA-DB1 and HLA-DM genes using PCR amplified genomic DNA with sequence specific oligonucleotide probes. Cohort 1 comprised 199 unselected patients with RA (mean (SD) age 45.5 (13.5) years; disease duration 11.9(8.8) years), whose disease severity was assessed using Larsen score on hand and foot radiographs. Cohort 2 comprised 95 patients with severe RA and 70 patients with benign RA according to the Larsen method. RESULTS: In cohort 1, after stratification according to DRB1 genotypes, patients positive for HLA-DMA*0103 and negative for HLA-DRB1*04 tended to have greater articular damage on hands and wrists (p = 0.07 by Mann-Whitney U test) and reached statistical significance for the Larsen score per year (p = 0.05). This association between HLA-DMA*0103 and articular damage was especially observed in patients with HLA-DRB1*01. Similarly, HLA-DMB*0104 positive patients had higher Larsen score on hands and wrists (p = 0.02). This association was even stronger in DRB1*04 positive patients (p = 0.005). In cohort 2, HLA-DMA*0103 was associated with severe RA in patients negative for HLA-DRB1*04 (OD = 5.4; p = 0.014). HLA-DMB*0104 allele frequency tended to be higher in patients with severe RA but without reaching significance. CONCLUSION: This is the first study evaluating the role of HLA-DM genes in the severity of RA. Our results suggest that HLA-DMA*0103 and HLA-DMB*0104 alleles may represent new genetic markers of RA severity. The HLA-DMA*0103 allele tends to be associated with patients with RA negative for DRB1*04 and could predict a more severe form of disease especially in HLA-DRB1*01 positive patients. The HLA-DMB*0104 allele could have an additive effect in HLA-DRB1*04 patients. Combined determination of HLA-DM and HLA-DRB1 alleles could facilitate identification of patients likely to have a poor disease course.

Preliminary evaluation of medical outcomes (including quality of life) and costs in incident RA cases receiving hospital-based multidisciplinary management.

A six-month, prospective descriptive study of medical outcomes (including quality of life) and costs was conducted in 20 incident cases of rheumatoid arthritis (RA). Multidisciplinary management was started during an inpatient stay at the beginning of the study. Patients were evaluated on a day-hospital basis three and six months later. The following parameters were studied: quality-of-life scores on a generic scale (the Nottingham Health Profile [NHP]) and two specific scales (Health Assessment Questionnaire [HAQ] and the short-form Arthritis Impact Measurement Scale [AIMS]), pain severity, disease activity assessed by the patient and physician, painful and swollen joint counts, erythrocyte sedimentation rate, and C-reactive protein level. The following costs were evaluated: laboratory tests, plain radiographs, other investigations, physician care (by rheumatologists or other specialists), second-line drug therapy and monitoring for its side effects, care by nurses, physical therapy, and occupational therapy. All patients showed significant improvement three months after initiation of multidisciplinary management. This effect was sustained through the sixth month. Quality-of-life scores improved, with the exceptions of the social isolation subscore on the NHP and the psychological impact, social activity, and occupational activity subscores on the short-form AIMS. Mean total cost for the six-month period was 3429 +/- 880 euros (1 euro = 6.6 FF). Laboratory tests contributed the largest portion of the total cost (39%), followed by rheumatologist care (16%); the other costs accounted for 7.6 to 9.2% of the total cost. This prospective medical and economic study is preliminary. Comparative studies are needed.