A significantly increased risk of acute rejection was observed at everolimus trough levels <3 ng/ml. This is a lower therapeutic concentration limit when everolimus is used with conventionally dosed cyclosporine. Because hyperlipidemias responded to counter-measure therapies and thrombocytopenia had an overall low incidence of 12%, everolimus-related adverse events were manageable up to the highest troughs observed in this population of 15 ng/ml. An upper therapeutic concentration limit is likely more than 15 ng/ml but a precise value could not be derived from these data.
In combination with Neoral and corticosteroids, RAD doses of 2 mg and 4 mg/day resulted in lower rates of acute rejection episodes and efficacy failure than the 1 mg/day dose and were significantly more effective in reducing the severity of rejection. Large-scale, controlled, follow-up studies are currently in progress to confirm these initial findings.
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