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  • Title: Serum beta-endorphin in primary fibromyalgia syndrome: a controlled study.
    Author: Yunus MB, Denko CW, Masi AT.
    Journal: J Rheumatol; 1986 Feb; 13(1):183-6. PubMed ID: 2939238.
    Abstract:
    Serum beta-endorphin was assayed without knowledge of study subject category in 44 consecutive patients with primary fibromyalgia syndrome, 3 patients with rheumatoid arthritis (RA), and 30 normal controls, all females. Mean serum beta-endorphin levels were 81 +/- 28 pg/ml in patients with fibromyalgia, whereas those in normal controls and patients with RA were 73 +/- 17 pg/mg and 73 +/- 18 pg/ml, respectively. These differences were not statistically significant. Serum beta-endorphin levels did not correlate with relevant clinical variables in either fibromyalgia or RA groups.
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