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Williams, M.E. et al.

Mark E. Williams, W. Kline Bolton, Raja G. Khalifah, Thorsten P. Degenhardt, Robert J. Schotzinger, Janet B. McGill,

Effects of pyridoxamine in combined phase 2 studies of patients with type 1 and type 2 diabetes and overt nephropathy.

BACKGROUND/AIMS: Treatments of diabetic nephropathy (DN) delay the onset of end-stage renal disease. We report the results of safety/tolerability studies in patients with overt nephropathy and type 1/type 2 diabetes treated with pyridoxamine, a broad inhibitor of advanced glycation. METHODS: The two 24-week studies were multicenter Phase 2 trials in patients under standard-of-care. In PYR-206, patients were randomized 1:1 and had baseline serum creatinine (bSCr) <or=2.0 mg/dl. In PYR-205/207, randomization was 2:1 and bSCr was <or=2.0 for PYR-205 and >or=2.0 but <or=3.5 mg/dl for PYR-207. Treated patients (122 active, 90 placebo) received 50 mg pyridoxamine twice daily in PYR-206; PYR-205/207 patients were escalated to 250 mg twice daily. RESULTS: Adverse events were balanced between the groups (p = NS). Slight imbalances, mainly in the PYR-205/207 groups, were noted in deaths (from diverse causes, p = NS) and serious adverse events (p = 0.05) that were attributed to pre-existing conditions. In a merged data set, pyridoxamine significantly reduced the change from baseline in serum creatinine (p < 0.03). In patients similar to the RENAAL/IDNT studies (bSCr >or=1.3 mg/dl, type 2 diabetes), a treatment effect was observed on the rise in serum creatinine (p = 0.007). No differences in urinary albumin excretion were seen. Urinary TGF-beta1 also tended to decrease with pyridoxamine (p = 0.049) as did the CML and CEL AGEs. CONCLUSION: These data provide a foundation for further evaluation of this AGE inhibitor in DN.[1]

References

Effects of pyridoxamine in combined phase 2 studies of patients with type 1 and type 2 diabetes and overt nephropathy. Williams, M.E., Bolton, W.K., Khalifah, R.G., Degenhardt, T.P., Schotzinger, R.J., McGill, J.B. Am. J. Nephrol. (2007) [Pubmed]

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