Phase 3 Studies of the Tezacaftor/Ivacaftor Combination Treatment in People with Cystic Fibrosis Ages 12 and Older Published in the New England Journal of Medicine
BOSTON--(BUSINESS WIRE) Nov 3, 2017 -- Vertex Pharmaceuticals Incorporated (Nasdaq: VRTX) announced today that the New England Journal of Medicine (NEJM) published two articles with results from two Phase 3 studies of the tezacaftor/ivacaftor combination treatment, a medicine in development that is designed to treat the underlying cause of cystic fibrosis (CF) in people ages 12 and older who have certain mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. In both studies, the tezacaftor/ivacaftor combination demonstrated statistically significant and clinically meaningful improvements in lung function and other measures of disease. The EVOLVE study evaluated the combination in people who have two copies of the F508del mutation, the most common mutation in the CFTR gene. The EXPAND study evaluated the combination in people with one F508del mutation and one mutation that results in residual CFTR function. The results were published in two online articles today in conjunction with two oral presentations at the 31st Annual North American Cystic Fibrosis Conference, November 2 to 4, 2017 in Indianapolis. These data formed the basis of applications for the approval of the tezacaftor/ivacaftor combination that are currently under review with regulatory agencies in the United States and Europe. In the United States, the Food and Drug Administration (FDA) has granted Priority Review of the application and has set an action date of February 28, 2018.
"We have made unprecedented progress in the treatment of CF in recent years, but we continue to drive ourselves to deliver even greater benefits for patients today and more new medicines for patients who are still waiting," said Jeffrey Chodakewitz, M.D., Executive Vice President and Chief Medical Officer at Vertex. "These tezacaftor/ivacaftor results are exciting because they represent the potential to do both."
Summary of Key Data from EVOLVE
The 24-week EVOLVE study evaluated tezacaftor/ivacaftor in more than 500 people with CF ages 12 and older who have two copies of the F508del mutation. Improvements across multiple disease measures, including lung function, were demonstrated among patients treated with tezacaftor/ivacaftor compared to those who received placebo. There was also a reduction in pulmonary exacerbations among those treated with tezacaftor/ivacaftor.
"In this study, the tezacaftor/ivacaftor combination demonstrated significant, clinically meaningful improvements in lung function and other measures of cystic fibrosis health status," said Jennifer Taylor-Cousar, M.D., co-lead author of the EVOLVE study and Associate Professor, Departments of Medicine and Pediatrics, Pulmonary Divisions, Medical Director of Clinical Research Services and Co-Director and Director of the CF Therapeutics Development Network, Adult CF Program, National Jewish Health, Colorado. "Tezacaftor/ivacaftor was also very well tolerated, which makes it an important potential new option for helping our patients feel better and change the course of their disease. The fact that tezacaftor/ivacaftor will be the basis of triple combination therapy makes this positive data even more exciting for patients with CF and the physicians who care for them."
Lung Function: Progressive lung disease is a major source of illness and is the leading cause of death in people with CF. The study met its primary endpoint with a mean absolute improvement in lung function (measured as percent predicted forced expiratory volume in one second, or ppFEV1) through 24 weeks of 4.0 percentage points from baseline compared to placebo (p < 0.0001). This equates to a mean relative improvement (a key second endpoint in the study), which is an assessment of the percentage change, of 6.8 percent (p < 0.0001).
Pulmonary Exacerbations: Pulmonary exacerbations are episodes of worsening signs and symptoms of the disease that often require treatment with intravenous antibiotics or hospitalization. Through the 24-week study, those receiving tezacaftor/ivacaftor had a 35 percent reduction in the annualized rate of pulmonary exacerbations compared to those on placebo (p=0.0054). In addition, patients receiving tezacaftor/ivacaftor were 47 percent less likely to experience a pulmonary exacerbation that required hospitalization or intravenous antibiotics than those receiving placebo (p=0.0042).
Body Mass Index: Body mass index, or BMI, is a measure of body fat based on a person's height and weight. For people with CF, BMI is one way of assessing nutritional status; poor nutritional status, and thus lower BMI, is associated with worse lung function. In EVOLVE, people receiving tezacaftor/ivacaftor had a non-statistically significant BMI increase of 0.06 compared to those receiving placebo (p=0.4127).
Patient-Reported Outcomes: The Cystic Fibrosis Questionnaire — Revised (CFQ-R) is a validated patient-reported outcome tool that was used in the EVOLVE study to measure the impact of tezacaftor/ivacaftor on overall health, daily life, perceived well-being and symptoms. One aspect of the CFQ-R, referred to as the respiratory domain, addresses patient reported symptoms including things such as coughing, congestion, wheezing and other respiratory symptoms. In EVOLVE, the mean absolute improvement in the respiratory domain of CFQ-R at Week 24 was 5.1 compared to those receiving placebo (p < 0.0001). This increase is considered nominally statistically significant.
Safety: The tezacaftor/ivacaftor combination treatment was generally well tolerated. The majority of adverse events were mild or moderate. The most common adverse events (≥15%), regardless of treatment group, were infective pulmonary exacerbation, cough, headache, nasopharyngitis and sputum increased. The rate of discontinuations due to adverse events was low and similar between the placebo group and the combination treatment group. Rates of adverse events, serious adverse events and respiratory-related adverse events were similar between the placebo and the tezacaftor/ivacaftor combination treatment groups.
Summary of Key Data from EXPAND
The EXPAND study evaluated eight weeks of treatment with the tezacaftor/ivacaftor combination, ivacaftor monotherapy or placebo in approximately 250 people with CF ages 12 and older who have one F508del mutation and one mutation that results in residual CFTR function. Improvements across multiple disease measures, including lung function, were demonstrated among patients treated with tezacaftor/ivacaftor and those treated with ivacaftor alone in the study compared to those who received placebo.
"This is an exciting time to be part of cystic fibrosis research as we continue to improve outcomes for patients," said Steven M. Rowe, M.D., M.S.P.H., co-lead author of the EXPAND study and Professor of Medicine, Pediatrics, and Cell, Developmental and Integrative Biology, Director of the Gregory Fleming James Cystic Fibrosis Research Center, Nancy and Eugene Gwaltney Endowed Chair in Medical Research, University of Alabama at Birmingham. "These results are particularly exciting because they demonstrate that by addressing the underlying cause of cystic fibrosis, the tezacaftor/ivacaftor combination offers significant benefits for many people with this severe and life-shortening disease, while also offering increased benefit over KALYDECO alone in patients with residual function mutations."
Lung Function: The EXPAND study met its primary endpoint of absolute improvement in lung function, with those receiving tezacaftor/ivacaftor demonstrating a mean absolute improvement of 6.8 percentage points compared to placebo (p < 0.0001) and the ivacaftor monotherapy group demonstrating a mean absolute improvement of 4.7 percentage points compared to placebo (p < 0.0001). Improvements in lung function were measured as the change in ppFEV1 from the start of the study (baseline) to the average of the Week 4 and Week 8 measurements. An additional pre-specified analysis showed that the tezacaftor/ivacaftor combination treatment provided a statistically significant improvement in ppFEV1 over ivacaftor alone (2.1 percentage points, p < 0.0001).
Patient-Reported Outcomes: In EXPAND, the mean absolute improvement in the respiratory domain of CFQ-R (the key secondary endpoint), measured as the average of the Week 4 and Week 8 measurements, was 11.1 for those receiving tezacaftor/ivacaftor and was 9.7 for those receiving ivacaftor, both compared to placebo (p < 0.0001).
Safety: In the EXPAND study, the safety profile observed for the tezacaftor/ivacaftor combination treatment was favorable and similar to that seen in the EVOLVE study. Tezacaftor/ivacaftor combination treatment and ivacaftor monotherapy were both generally well tolerated. The majority of adverse events were mild or moderate. The most common adverse events (≥15%), regardless of treatment group, were cough and infective pulmonary exacerbation. There were no discontinuations due to adverse events in the combination treatment group. Discontinuations due to adverse events were low and similar between the placebo group and the ivacaftor monotherapy group. The incidence of adverse events, serious adverse events and respiratory-related adverse events was similar between the placebo, tezacaftor/ivacaftor combination and ivacaftor monotherapy groups.
About Cystic Fibrosis
Cystic Fibrosis (CF) is a rare, life-shortening genetic disease affecting approximately 75,000 people in North America, Europe and Australia.
CF is caused by a defective or missing cystic fibrosis transmembrane conductance regulator (CFTR) protein resulting from mutations in the CFTR gene. Children must inherit two defective CFTR genes — one from each parent — to have CF. There are approximately 2,000 known mutations in the CFTR gene. Some of these mutations, which can be determined by a genetic test, or genotyping test, lead to CF by creating non-working or too few CFTR proteins at the cell surface. The defective function or absence of CFTR protein results in poor flow of salt and water into and out of the cell in a number of organs. In the lungs, this leads to the buildup of abnormally thick, sticky mucus that can cause chronic lung infections and progressive lung damage in many patients that eventually leads to death. The median age of death is in the mid-to-late 20s.
In people with the F508del mutation, the CFTR protein is not processed, or folded, normally within the cell and generally does not reach the cell surface. Tezacaftor is designed to address the processing defect of F508del-CFTR to enable it to reach the cell surface where ivacaftor can further enhance the protein's function.
In North America, Europe and Australia, there are more than 22,000 people ages 12 and older who have two copies of the F508del mutation, and there are more than 1,500 people ages 12 and older who have at least one residual function mutation that is responsive to tezacaftor/ivacaftor in vitro or in the clinic.
Vertex is a global biotechnology company that invests in scientific innovation to create transformative medicines for people with serious and life-threatening diseases. In addition to clinical development programs in CF, Vertex has more than a dozen ongoing research programs focused on the underlying mechanisms of other serious diseases.
Founded in 1989 in Cambridge, Mass., Vertex's headquarters is now located in Boston's Innovation District. Today, the company has research and development sites and commercial offices in the United States, Europe, Canada and Australia. Vertex is consistently recognized as one of the industry's top places to work, including being named to Science magazine's Top Employers in the life sciences ranking for eight years in a row. For additional information and the latest updates from the company, please visit www.vrtx.com.
Collaborative History with Cystic Fibrosis Foundation Therapeutics, Inc. (CFFT)
Vertex initiated its CF research program in 2000 as part of a collaboration with CFFT, the nonprofit drug discovery and development affiliate of the Cystic Fibrosis Foundation. KALYDECO® (ivacaftor), ORKAMBI®(lumacaftor/ivacaftor), tezacaftor, VX-440, VX-152 and VX-659 were discovered by Vertex as part of this collaboration.
Special Note Regarding Forward-looking Statements
This press release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995, including, without limitation, statements in the second, fourth and eleventh paragraphs and statements regarding the tezacaftor/ivacaftor combination and the timing of the potential regulatory approval of the tezacaftor/ivacaftor combination. While Vertex believes the forward-looking statements contained in this press release are accurate, there are a number of factors that could cause actual events or results to differ materially from those indicated by such forward-looking statements. Those risks and uncertainties include, among other things, (i) that regulatory authorities may not approve, or approve on a timely basis, the tezacaftor/ivacaftor combination due to safety, efficacy or other reasons, and (ii) other risks listed under Risk Factors in Vertex's annual report and quarterly reports filed with the Securities and Exchange Commission and available through the company's website at www.vrtx.com. Vertex disclaims any obligation to update the information contained in this press release as new information becomes available.
Source: Vertex Pharmaceuticals Incorporated
Posted: November 2017
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