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OPKO Completes Patient Recruitment In Second Phase 3 Trial Of RayaldyTM

OPKO Health, Inc. (NYSE: OPK), has completed patient recruitment in the second phase 3 trial of  Rayaldy TM to treat patients with secondary hyperparathyroidism (SHPT), stage 3 or 4 chronic kidney disease (CKD) and vitamin D insufficiency. This trial is the second of two identical randomized, double-blind, placebo-controlled, multi-site studies intended to establish the safety and efficacy of  Rayaldy TM  as a new treatment for SHPT in the targeted population. The endpoints of both studies, which are being conducted in parallel, include vitamin D status and changes in serum calcium, serum phosphorus and plasma intact parathyroid hormone (PTH).

Each of the two pivotal phase 3 trials involves approximately 210 patients recruited at approximately 40 sites in the United States (U.S.). Patients are being stratified by CKD stage and randomized in a 2:1 fashion to receive six months of treatment with either  Rayaldy TM  or placebo. Top-line data from both trials are expected in mid-2014.

The two pivotal trials are being followed by an open-label extension study in which patients are treated, at their election, for an additional 6 months with Rayaldy TM . More than 50% of the required patients have enrolled in this open-label study and some have already completed treatment.

About  Rayaldy TM

Rayaldy TM  is a first-in-class oral vitamin D prohormone treatment being developed for SHPT in stage 3 and 4 CKD patients with vitamin D insufficiency. It has a proprietary modified-release formulation designed to gradually and reliably raise serum total 25-hydroxyvitamin D (prohormone) concentrations to targeted levels (at least 30 ng/mL) while avoiding upregulation of CYP24, a cytochrome P-450 enzyme that reduces the PTH lowering potency of current vitamin D supplements. Activation of calcifediol, the active ingredient in Rayaldy TM , by the kidney is tightly regulated, preventing excessive elevation of serum calcium and related side effects which encumber current vitamin D hormone therapies and promote vascular and renal calcification. Once approved,  Rayaldy TM  is expected to address the approximately 4 million CKD stage 3 and 4 patients in the U.S. and many more, elsewhere, with SHPT and vitamin D insufficiency.

About Chronic Kidney Disease

CKD is a condition characterized by a progressive decline in kidney function. The kidney is normally responsible for excreting waste and excess water from the body, and for regulating various hormones. CKD is classified in five different stages — mild (stage 1) to severe (stage 5) disease — as measured by the kidney's glomerular filtration rate. According to the National Kidney Foundation, CKD afflicts over 26 million people in the U.S., including more than eight million patients with moderate (stages 3 and 4) and severe (stage 5) forms of CKD. In stage 5 CKD, kidney function is minimal to absent and patients require regular dialysis or a kidney transplant for survival.

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