Brian Lian
Analyst · Maxim Group. Please go ahead
Thanks Mike. Since the Company's inception, we have worked diligently to advance our two lead programs, VK5211 and VK2809. During 2017 we completed and announced the results from a successful Phase 2 trial of VK5211 in patients recovering from hip fracture. We also made progress with our Phase 2 trial of VK2809 for non-alcoholic fatty liver disease and hypercholesterolemia. In addition to these two Phase 2 programs, in 2017 we generated positive data supporting the continued development of our earlier-stage orphan disease programs addressing glycogen storage disease and X-linked adrenoleukodystrophy. I'll now provide more detail for each program. VK5211 is Viking's lead program for muscle and bone disorders. It is an orally available non-steroidal selective androgen receptor modulator, or SARM, designed to selectively stimulate muscle and bone formation with reduced activity in peripheral tissues such as skin and prostate. Following hip fracture, many patients experience a loss of bone and muscle at accelerated rates, placing them at increased risk of further morbidity, re-fracture and prolonged disability. During the fourth quarter, we announced positive results from a 12-week Phase 2 clinical trial of VK5211 in patients who had recently suffered a hip fracture. Top line data showed that the trial achieved its primary endpoint, demonstrating statistically significant dose-dependent increases in lean body mass, less head, following treatment with VK5211 compared with placebo. The study also achieved important secondary endpoints, demonstrating statistically significant increases in appendicular lean body mass, which is muscle in the limbs, and total lean body mass for all doses of VK5211, compared to placebo. Importantly, VK5211 also demonstrated encouraging safety and tolerability in this study, with no drug-related serious adverse events reported. I'd like to take a minute to quickly review the key results from this study. The Phase 2 clinical trial was a randomized, double-blind, placebo-controlled, parallel group, international study designed to evaluate the efficacy, safety and tolerability of VK5211 in patients recovering from hip fracture surgery. A total of 108 patients were randomized to receive once-daily VK5211 doses of 0.5 mg, 1 mg, 2 mg, or placebo for 12 weeks. On the primary endpoint of total lean body mass, less head, all VK5211 treatment arms demonstrated highly statistically significant increases in lean body mass relative to placebo. Specifically, patients receiving VK5211 doses of 0.5 mg experienced a mean placebo-adjusted increase in lean body mass of 4.8% or 1.6 kg. Patients receiving VK5211 doses of 1 mg daily experienced a mean placebo-adjusted increase in lean body mass of 7.2% or 2.5 kg. And patients receiving VK5211 doses of 2 mg daily experienced a mean placebo-adjusted increase in lean body mass of 9.1% or 3.1 kg. In addition, all VK5211 dosing cohorts demonstrated statistically significantly greater proportions of patients achieving at least a 5% increase in lean body mass compared with placebo. Approximately 19% of placebo patients experienced at least a 5% increase in lean body mass. By comparison, approximately 61% of VK5211 patients in the 0.5 mg cohort achieved at least a 5% increase. Approximately 65% of patients in the 1 mg cohort achieved at least a 5% increase. And 75% of patients receiving VK5211 doses of 2 mg demonstrated at least a 5% increase. Another key secondary efficacy endpoint, assess the effect of VK5211 on appendicular lean body mass. Appendicular lean body mass is the lean mass found in the arms and legs and is particularly important to maintain in older people. On this endpoint, patients receiving VK5211 doses of 0.5 mg daily experienced a mean placebo-adjusted increase of 6.1% or 0.8 kg. Patients receiving doses of 1 mg daily experienced a mean placebo-adjusted increase in appendicular lean mass of 9% or 1.3 kg. And patients receiving VK5211 doses of 2 mg daily experienced a mean placebo-adjusted increase of 10.2% or 1.4 kg. All of these improvements were statistically significant relative to placebo. These data demonstrate not only the efficacy of VK5211 in stimulating formation of appendicular lean mass, but once again show the impressive dose response relationship observed in this study. Lastly, and of particular interest, given the older, more frail nature of this population, there were no significant differences in the rates of adverse events reported among patients receiving VK5211 compared with placebo. There were also no dose-related differences in reported adverse events among various VK5211 treatment groups and no drug-related SAEs were observed in any patient receiving VK5211. Looking ahead, we expect to present the detailed data from this study at an appropriate scientific conference. We are very excited about the robust efficacy demonstrated in this study as these results provide compelling evidence of VK5211's efficacy and pharmacologic impact on muscle growth. As we previously indicated, we believe the further development of VK5211 for hip fracture may be most effectively executed by a partner, particularly one with an existing bone or musculoskeletal franchise. To this end, we continue to explore opportunities that will allow us to create further value with the program and we will provide updates as appropriate. I'll now review recent progress with our second clinical program, VK2809, which is in a Phase 2 study enrolling patients with non-alcoholic fatty liver disease and hypercholesterolemia. VK2809 is a novel, orally available small molecule thyroid receptor agonist that possesses selectivity for liver tissue, as well as the beta receptor subtype. Preclinical studies have demonstrated that treatment with VK2809 leads to rapid histologic improvement in animal models of liver disease, including a model of diet-induced and biopsy-confirmed NASH, as well as significant reductions in LDL cholesterol and triglycerides in humans. In a prior Phase 1b study in patients with mild hypercholesterolemia, VK2809 was shown to significantly reduce not only LDL-cholesterol and triglycerides, but also both lipoprotein(a) and apolipoprotein B, two proteins associated with increased risks of cardiovascular disease. These data suggest potential long-term cardiovascular benefits that extend beyond those provided by LDL reduction alone. The overall profile of VK2809 thus far suggests promise in diseases that result from lipid dysregulation as well as diseases related to liver fat such as NASH. In the second quarter of 2017, we announced data from a study of VK2809 in an animal model of NASH. The study was designed to evaluate VK2809 dosed orally once per day for eight weeks in rodents that had developed true diet-induced NASH as confirmed by a pre-study biopsy. In the study, animals receiving VK2809 demonstrated statistically significant reductions in fibrosis, liver collagen, liver steatosis, and the non-alcoholic fatty liver disease activity score, also known as NAS, which is composite measure of steatosis, inflammation and ballooning. We presented final results from this study last October at the AASLD meeting in Washington, D.C. Key results included data showing that eight weeks of treatment with VK2809 produced an 80% reduction in total liver lipids, a 70% reduction in liver triglycerides, a 65% reduction in liver cholesterol, and a 40% reduction in the NAS score. All of these data were statistically significant. Treatment with VK2809 also resulted in statistically significant reductions in key measures of fibrotic activity, including a 50% reduction in total liver fibrosis, a 60% reduction in type I collagen content, and a 46% reduction in liver hydroxyproline content. These observed effects on fibrosis and collagen content are of particular importance as scientific literature suggests that liver fibrosis is associated with long-term outcomes in patients with non-alcoholic fatty liver disease and that hepatic collagen content is correlated with fibrosis staging and outcomes in these patients. Collectively, these studies provide a very encouraging picture of VK2809's potential benefit in the setting of NASH. Our ongoing Phase 2 trial is a randomized, double-blind, placebo-controlled, parallel group study designed to assess the efficacy, safety and tolerability of VK2809 in patients with elevated LDL cholesterol and non-alcoholic fatty liver disease. Patients are being randomized to receive once-daily oral doses of VK2809 or placebo for 12 weeks, followed by a four-week off-drug phase. The trial's primary endpoint will evaluate the effect of VK2809 on LDL cholesterol after 12 weeks compared to placebo. Secondary and exploratory endpoints include assessments of changes in liver fat content, plasma lipids, and inflammatory markers. We continue enrolling new patients in this study and currently expect to announce the results from the trial in the second half of 2018. This has been a challenging study to conduct but we are excited about VK2809's potential in this setting and look forward to reporting the top line data following completion of the trial. Assuming we receive positive results from this trial, our go forward strategy would be to meet with the appropriate regulatory agencies to discuss and identify next steps. At the same time, we will evaluate all options, including partnering, for the advancement of the program. I'd now like to address Viking's two orphan disease programs, both of which we believe have the potential to be best-in-class options for serious conditions with no available treatments. These rare disease programs offer unique opportunities for Viking. Specifically, as the required trial sizes and associated expenses are often lower than for the larger indications, Viking could potentially advance these programs independently without the support of a partner. I'll first discuss our program evaluating VK2809 in the glycogen storage disease type Ia, or GSD Ia, which continues to advance. GSD Ia is an orphan genetic disease caused by a deficiency of glucose-6-phosphatase, an enzyme responsible for the liver's production of glucose from glycogen and gluconeogenesis. The disease, for which there is no pharmacologic treatment, results in increased triglyceride production and elevated hepatic triglyceride content. This can potentially lead to hepatic steatosis, development of hepatic adenomas, and hepatocellular carcinoma. In the third quarter of 2017, we reported final results from an in vivo proof-of-concept study which evaluated VK2809 in a model of GSD Ia. This study was conducted under a sponsored research agreement between Viking and Duke University and the results were presented at the 13th International Congress of Inborn Errors of Metabolism in Rio De Janeiro, Brazil. The results demonstrated that treatment with VK2809 led to statistically significant reductions in key metabolic markers of GSD Ia. Specifically, VK2809 produced a 69% reduction in liver triglycerides, a 36% reduction in liver weights, and a 54% reduction in liver triglyceride concentration, compared to vehicle-treated controls. We believe the rapid and significant reductions in liver triglyceride content, combined with the reduction of total triglycerides within normal ranges for wild type animals, provide support for the continued development of VK2809 as a treatment for GSD Ia. To that end, we recently filed an IND to advance VK2809 into a proof-of-concept study in patients with GSD Ia and we expect to begin dosing in this trial in the near term. Our second orphan disease program is evaluating our small molecule thyroid receptor agonist, VK0214, as a treatment for X-linked adrenoleukodystrophy or X-ALD. X-ALD is a debilitating disease caused by a defect in a peroxisomal transporter called ABCD1. These patients are often characterized by the accumulation of very long chain fatty acids in plasma and tissue. Sustained elevations in very long chain fatty acids are believed to contribute to the severe cerebral and motor neuron toxicities commonly observed in this disease. Activation of the thyroid beta receptor is believed to stimulate the metabolism of very long chain fatty acids, providing a potential therapeutic benefit. VK0214 is an orally available small molecule thyroid receptor agonist that possesses selectivity for the beta receptor subtype and may therefore represent a potential pharmacologic approach to the disease. In 2017, we along with our collaborators at the Kennedy Krieger Institute completed a 25-week study evaluating VK0214 in an animal model of X-ALD, called the ABCD1 knockout model. The results from this study were presented last October at the 87th Annual Meeting of the American Thyroid Association. As we discussed on our last quarterly call, the data showed that treatment with VK0214 for 25 weeks led to significant reductions in plasma levels of multiple very long chain fatty acids, including the benchmark highly toxic C26 fatty acid. Importantly, data from this study also showed that very long chain fatty acid levels in CNS tissues were significantly reduced, suggesting a potential direct benefit in both brain and spinal cord. In addition, the result showed improved expression of the compensatory transporter known as ABCD2 in both brain and liver tissue. As I mentioned earlier, the accumulation of very long chain fatty acids is believed to contribute to the underlying pathology of X-ALD. Thus, these data showing reduced very long chain fatty acids, as well as improved transporter expression, provide additional support for the role of selective thyroid receptor beta activation as a potential therapeutic approach to the treatment of X-ALD. We are currently initiating IND enabling work and plan to file an IND for VK0214 by the end of 2018. With two clinical programs and two preclinical programs rapidly advancing, it is critical that we have adequate resources to continue development of our pipeline assets. To that end, we recently raised $78 million in gross proceeds through two financings, one during the fourth quarter of 2017 and one during the first quarter of 2018. Beyond providing the financial resources required to advance our programs, these financings strengthened Viking's shareholder base through the addition of multiple fundamental, long-term life science investors, and we are grateful for their support. As a result of these financings, we believe our runway currently extends into the 2020 timeframe. In conclusion, with positive Phase 2 data for VK5211 in hip fracture, the promise of VK2809 in fatty liver disease and hypercholesterolemia, and encouraging proof-of-concept data from both our GSD Ia and X-ALD programs, we believe we have an exciting and diverse pipeline targeting multiple indications with high unmet need and representing substantial commercial opportunities. Looking forward in 2018, we expect to continue our partnering discussions for VK5211, announce the results from our Phase 2 trial of VK2809, initiate a proof-of-concept trial of VK2809 in GSD Ia, and file an IND for VK0214 in X-ALD. We look forward to reporting our progress in each of these areas in the coming months. This concludes our prepared statements for today. Thanks for your support and thanks for joining us. And I'd now like to open the call for questions. Operator?