The concentration of LT-α in the synovial fluid from RA patients was 18.30 ± 28.40 (mean ± standard deviation) pg/ml, while that from OA patients was 5.96 ± 2.70 pg/ml (n = 10 in the RA group, n = 11 in the OA group). This evidence concerns the gene LTA and rheumatoid arthritis.