The Phase 1 results showed that all four tablet strengths of Oral CR845 (0.25, 0.5, 1.0 and 2.5 mg) were generally well-tolerated when administered either daily or after dialysis three times per week. Top-line pharmacokinetic analysis indicated that plasma levels of CR845 attained after oral administration of doses up to 2.5 mg were comparable to or exceeded those attained with clinically efficacious intravenous (I.V.) doses of CR845 for the treatment of moderate-to-severe CKD-associated pruritus (CKD-aP) in hemodialysis patients. The plasma levels of CR845 attained after oral administration of the 1.0 mg tablet strength approximated those attained with the 1.0 mcg/kg I.V. CR845 dose, which demonstrated significant clinical benefit in the recently reported Phase 2/3 trial in hemodialysis patients with CKD-aP.
"We are pleased to establish that
plasma levels of CR845 attained with oral tablets equaled or exceeded plasma levels previously associated with clinically efficacious I.V. CR845 doses in hemodialysis patients with moderate-to-severe CKD-associated pruritus," said Frédérique Menzaghi, Ph.D., Vice President of Research and Development at
Phase 1 Trial Design and Results
The Phase 1 trial was a three-part, randomized, placebo-controlled study to evaluate the safety and pharmacokinetics of Oral CR845 tablets in 90 hemodialysis patients. In Part A, ascending repeated oral doses of 0.25, 0.5, 1.0 and 2.5 mg were given to four cohorts of patients (n=47) after each dialysis (i.e., three times) over a one-week treatment period. In Part B, ascending repeated oral doses of 0.25, 0.5 and 1.0 mg were given daily to three cohorts of hemodialysis patients (n=36). In Part C, the final crossover phase of the study, patients were administered a single 1.0 mg oral dose of CR845 or a single 1.0 mcg/kg I.V. dose of CR845 (n=7) given after hemodialysis with a one-week washout period between treatments to determine the absolute bioavailability of Oral CR845. Parts A and B randomized up to 12 patients per dose group (nine active and three placebo). Part C was conducted as an open-label phase with seven patients receiving active drug.
Overall, the frequency of treatment emergent adverse events (TEAEs) in CR845-treated patients was similar to the group administered placebo. All TEAEs were generally mild and comparable to those reported in the Phase 2/3 trial after I.V. CR845 administration in CKD-aP patients undergoing hemodialysis. Absolute oral bioavailability of the 1.0 mg tablet strength was determined to be similar in hemodialysis patients to that obtained in non-CKD patients.
About CR845 for the Treatment of CKD-associated Pruritus
About CKD-associated Pruritus
CKD-aP is an intractable systemic itch condition that occurs with the greatest frequency and intensity in CKD patients undergoing hemodialysis and peritoneal dialysis; however, pruritus has also been reported in CKD patients who are not yet on dialysis. Aggregate, longitudinal, multi-country studies estimate the weighted prevalence of CKD-aP to be approximately 50 percent of patients with CKD stages 3-5 with approximately 25 percent of patients reporting moderate-to-severe pruritus. This represents approximately 4-5 million patients in
CR845 is a peripherally acting kappa opioid receptor agonist currently in development for the treatment of acute and chronic pain and pruritus. In more than 1,200 subjects dosed to date either intravenously or orally, CR845 was observed to be well-tolerated, without incurring the dysphoric and psychotomimetic side effects that have been reported with centrally acting (CNS-active) kappa opioid receptor agonists, and lacking the respiratory depression and abuse liability of mu opioid receptor agonists.
Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Examples of these forward-looking statements include statements concerning CR845's potential to treat
CKD-aP, the establishment of the clinical utility of Oral CR845 and the future clinical development of Oral CR845, including the expected timing and design of any additional clinical trial(s). Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Risks are described more fully in
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