The purpose of a TQT study is to rule out the potential for a drug to cause prolongation of the mean corrected QT interval (known as the QTc interval). Prolongation of the QTc interval increases the risk of ventricular arrhythmia, which can lead to palpitations, fainting and sudden death. Drugs that cause QTc prolongation are often contraindicated in certain "at risk" patients or in patients taking select concomitant medications that also cause QTc prolongation.
The completed RPC1063 TQT study enrolled 124 subjects, with 62 subjects randomized to receive RPC1063 at an intended therapeutic dose (1 mg/day) and at a supra-therapeutic dose (2 mg/day), and 62 subjects randomized to receive placebo. The dosage of RPC1063 was titrated in this study from 0.25 mg to 2.0 mg over 14 days of treatment. The primary objective of the TQT study was to assess whether exposure to therapeutic and supra-therapeutic doses of RPC1063 in healthy subjects increased the QTc interval compared to placebo. As previously disclosed, the primary objective of the TQT study was met. Specifically, the study was "negative" in that a relevant QTc effect was ruled out for RPC1063 at both the therapeutic and the supra-therapeutic doses. In addition, the TQT study was validated by reproducing the known effect of a positive control treatment (moxifloxacin) on the QTc interval as part of the study. This study nearly doubled the subject exposure to RPC1063, building on the results of a prior Phase I trial in 88 healthy subjects that demonstrated target reductions in lymphocyte counts as well as a desirable safety and tolerability profile.
The TQT study included additional assessments in order to establish further evidence for a potentially improved cardiac safety profile for RPC1063. In particular, heart rate changes were measured using the dose titration regimen, which is being employed in all ongoing and planned RPC1063 studies. Detailed heart rate data was collected through continuous 24-hour ambulatory ECG monitoring pre-dose and throughout the dose escalation period to assess changes in heart rate and the risk of any cardiac adverse events. The dose titration regimen appeared to attenuate the first dose heart rate effects and was well tolerated. No serious adverse events occurred during the TQT study and a similar proportion of subjects experienced mild or moderate adverse events in both the placebo and RPC1063-treated groups.
Separately, the Company confirmed as previously disclosed that it has obtained two Special Protocol Assessment (SPA) agreements from the
"We are encouraged by the results of the TQT study, which contribute to our understanding of the emerging favorable safety and tolerability profile of RPC1063," said
About RPC1063 and S1P1R Modulators
RPC1063 is a novel, oral, once daily, selective and potent S1P1R modulator in development for autoimmune indications. Previously reported Phase 1 results demonstrated adequate pharmacokinetic, pharmacodynamic and safety features, which provide supportive data for the differentiation strategy for RPC1063 as a potential best-in-class second generation S1P1R modulator.
Statements contained in this release, other than statements of historical fact, constitute "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. The words "expects," "believes," "may," "intends," "potential" and similar expressions are intended to identify forward-looking statements. These forward-looking statements do not constitute guarantees of future performance. Investors are cautioned that forward-looking statements, including without limitation statements regarding the safety, efficacy and projected development timeline of RPC1063, constitute forward-looking statements. Such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated. These forward-looking statements are based upon the Company's current expectations and involve
assumptions that may never materialize or may prove to be incorrect. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties, which include without limitation risks associated with the process of discovering, developing and commercializing drug candidates that are safe and effective for use as human therapeutics. These and other risks are described in detail in the Company's
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