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  • Title: Is body size a biomarker for optimizing dosing of omega-3 polyunsaturated fatty acids in the treatment of patients with IgA nephropathy?
    Author: Donadio JV, Bergstralh EJ, Bibus DM, Grande JP.
    Journal: Clin J Am Soc Nephrol; 2006 Sep; 1(5):933-9. PubMed ID: 17699310.
    Abstract:
    Re-analysis of the North American IgA Nephropathy Study suggested that efficacy of omega-3 polyunsaturated fatty acids (omega-3 PUFA) was dosage-dependent on the basis of body size and plasma omega-3/omega-6 and eicosapentaenoic acid (EPA)/arachidonic acid (AA) ratios. The objective of this study was to confirm these assertions. Data from a previously reported randomized 2-yr clinical trial in which two dosages of an ethyl ester omega-3 PUFA (Omacor) were given to 73 high-risk patients with IgA nephropathy were reviewed. Omacor also was used in the North American IgA Nephropathy Study. Parameters included body weight; body mass index (BMI); plasma phospholipid AA, EPA, and docosahexanoic acid (DHA) levels and serum creatinine and 24-h urine protein (UP) levels during the 2-yr trial; and time to ESRD after 6.4 yr. Plasma phospholipid levels of EPA, DHA, and EPA/AA ratios were significantly inversely correlated with increasing body weight and BMI in the Omacor 4-g dosage group but not in the Omacor 8-g dosage group. Conversely, increasing levels of lipid parameters were observed with increasing dosages of Omacor (EPA+DHA) in grams per kilogram of body weight at 6 wk of treatment. None of the plasma omega-3 PUFA levels, EPA/AA ratios, or Omacor dosage per kilogram was significantly associated with reciprocal serum creatinine or UP slopes during the 2-yr trial or with ESRD. This post hoc analysis of body weight and BMI, plasma omega-3 PUFA status, and renal outcome did not find that treatment efficacy of omega-3 PUFA was dosage dependent on the basis of body size.
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