Jonathan Leff
Analyst · Wells Fargo
Thanks, Jan. This past quarter has been an exciting and productive time for our company, as we have advanced our pipeline and made key hires in our clinical developments and regulatory groups to add depth and expertise in endocrinology. Many of you may have attended our R&D update in September, where we reviewed 3 of our internal pipeline programs, TransCon Growth Hormone, TransCon PTH and TransCon CNP. Today, I'll briefly review each program starting with the important progress we've made with our Phase III TransCon Growth Hormone program.
We are pleased to announce that the first patients have recently been enrolled in the U.S. in the global heiGHt Trial, our Phase III trial of TransCon Growth Hormone in children with growth hormone deficiency or GHD. Similar in design to our Phase II trial in pediatric GHD patients, the heiGHt Trial was a randomized, open-label, active control Phase III trial. The heiGHt Trial will compare outcomes in newly diagnosed children with GHD, receiving once weekly TransCon Growth Hormone to those receiving injections of daily growth hormone therapy. The primary endpoint is height velocity at 12 months. And patients will have the option to enroll in an open-label extension to collect long-term safety and efficacy data.
Following the positive interactions with the FDA and EMA, earlier this year, we have continued to complete international regulatory submissions. Our recent focus has been on site initiation and activation. We have secured numerous institutional review board approvals and are conducting site initiation visits on an ongoing basis. We also recently held an investigator meeting with physicians and clinical trials staff from sites including Australia, New Zealand and the U.S. At this meeting, enthusiasm for the heiGHt Trial, the TransCon Growth Hormone program and our endocrinology pipeline, in general, was high. We expect to have more visibility on the enrollment time lines in the first half of next year, and we'll update the public accordingly. As a reminder, the objective of the heiGHt Trial is to compare our long-acting growth hormone to daily growth hormone, from a safety, efficacy and tolerability standpoint. Our Phase III trial builds upon our randomized active control Phase II pediatric trial, which demonstrated the TransCon Growth Hormone at comparable safety, efficacy, tolerability and immunogenicity compared with daily growth hormone. You may recall that our TransCon Growth Hormone product candidate delivers growth hormone that is unmodified. This means, when released by our TransCon technology, the growth hormone can diffuse freely into the tissues and carry out the effects of native growth hormone, receptors for which are present on nearly every human cell. With the patient in mind, TransCon Growth Hormone is designed to be stored at room temperature and to be administered as a single injection via an auto-injector with a small needle and small volume to provide comparable tolerability as daily growth hormone. Our device is in final testing and is expected to be ready for the extension phase of the heiGHt Trial and for commercialization.
At our September R&D update, we also reviewed the preclinical data and discussed plans for 2 new programs, TransCon PTH and TransCon CNP. Both of these new product candidates leverage our TransCon platform, which can be applied across a broad range of targets. The first of these product opportunities is TransCon PTH for hypoparathyroidism, a rare and serious endocrine deficiency disorder that can result in a variety of neuromuscular, cardiovascular and other symptoms. The disease affects approximately 77,000 patients in the U.S., resulting in significant comorbidities, disease burden and low quality of life. Current standard of care includes large doses of calcium and vitamin D; and for patients who cannot be controlled with calcium and vitamin D, Natpara is the only approved replacement therapy for hypoparathyroidism. However, neither calcium, vitamin D nor Natpara fully control the disease. In particular, these treatments may fail to address some fundamental abnormalities, such as high urinary calcium levels and volatility of serum calcium levels. Natpara also substantially increases bone turnover, leading to loss of cortical bone mass over time. Prior clinical research, largely from the National Institutes of Health, has provided a road map for a target product profile that may control all aspects of the disease. We have created a product candidate, TransCon PTH, which is designed to follow this road map and overcome limitations of current therapies, by providing constant PTH exposure in the physiological range. We think this approach will achieve an effective replacement PTH therapy to more fully control the disease.
Importantly, data we have generated to-date in primate studies has demonstrated pharmacodynamic affects over 24 hours. Furthermore, in a rat model of hypoparathyroidism, in contrast to Natpara, TransCon PTH normalized serum calcium and phosphate levels. Our next step with TransCon PTH is submission of an IND or equivalent regulatory filing, which is planned for the second quarter of next year, followed shortly by initiation of clinical developments. Our Phase I study is expected to be a single and multiple ascending dose study in healthy volunteers.
Turning to our next product candidate, we've also developed a long-acting C-Type Natriuretic Peptide, TransCon CNP, which we believe can help induce growth and manage the numerous comorbidities associated with achondroplasia and associated skeletal dysplasias. Achondroplasia is a skeletal disease characterized by disproportionate short stature and is the most common type of dwarfism. The morbidity of this disease are extremely serious. Patients may suffer a lifetime of health challenges and experience higher mortality rates. There are currently no approved medical treatments and patients suffer numerous surgeries to alleviate the skeletal abnormalities. In addition, patients often elect to undergo surgical limb-lengthening through a series of painful operations, which highlights the unmet need. The cause of achondroplasia is well understood as a signaling defect in the FGFR3 receptor pathway, which normally negatively regulates chondrocyte growth. In the disease state, FGFR3 becomes constitutively or constantly active, thereby inhibiting chondrocyte growth. C Natriuretic Peptide, or CNP, has been shown to block the inhibitory signaling effect of FGFR3, enabling chondrocytes to return to more normal growth. In fact, early-stage clinical data suggest daily treatment with a CNP analog, currently in development, results in improved height velocity in these patients. However, this CNP analog has a 20-minute half-life, and achieves therapeutic CMP levels only for a portion of each day. Our long-acting CNP prodrug, TransCon CNP, is designed for once weekly delivery, achieving sustained therapeutic CNP levels for 7 days with a lower C-max, which may result in improved efficacy with reduced potential for episodes of hypotension, which has limited current investigational therapies. In relevant animal models, we have shown no change in blood pressure following administration of TransCon CNP. We have an ongoing primate study, for which we reported interim 2-month data at our R&D Day in September. We look forward to top line 6-month results of this study, which are expected during the first quarter of 2017. These and future studies aim to further characterize efficacy and the risk, if any, of hypotension. For TransCon CNP, we plan to submit an IND or equivalent filing in the fourth quarter of 2017 to support clinical development soon thereafter.
All 3 of these endocrinology-focused product candidates present compelling opportunities in areas of unmet need. I'm personally very enthusiastic about the prospects for each of these product candidates and their potential to address unmet patient needs.
Now, Scott will provide a financial update.