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  • Title: Serum lipoprotein(a) and apolipoprotein(a) phenotypes in patients with rheumatoid arthritis.
    Author: Asanuma Y, Kawai S, Aoshima H, Kaburaki J, Mizushima Y.
    Journal: Arthritis Rheum; 1999 Mar; 42(3):443-7. PubMed ID: 10088766.
    Abstract:
    OBJECTIVE: To determine serum lipoprotein(a) (Lp[a]) concentrations and to analyze the apolipoprotein(a) (Apo[a]) phenotype in patients with rheumatoid arthritis (RA). METHODS: The subjects included 131 patients with RA and 200 healthy control subjects. Serum Lp(a) concentrations were measured by enzyme-linked immunosorbent assay, and the Apo(a) phenotype was determined by immunoblotting. HLA-DR typing was also done. RESULTS: The mean serum Lp(a) level was significantly higher (P < 0.001) in the RA patients (27.5 mg/dl) than in the controls (15.0 mg/dl). The S3 allele was found in 70.0% of the patients versus 39.5% of the controls (P < 0.001). There was no significant difference in HLA-DR4 positivity between patients with and without the S3 phenotype. CONCLUSION: The serum Lp(a) level was increased in patients with RA, possibly partly because of S3 phenotype predominance.
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