Daré Bioscience Announces Positive Topline Results from DARE-VVA1 Phase 1/2 Clinical Study
DARE-VVA1 Demonstrated Improvement in Vaginal Cytology Parameters and Bothersome Symptoms of Vulvar and Vaginal Atrophy (VVA),
Investigational Therapy for Women with VVA Who Cannot, or Should Not, Take Supplemental Estrogen, Including Women with Hormone Receptor-Positive (HR+) Breast Cancer
There are Currently No FDA-Approved Products Labeled for VVA Treatment for Patients with or at Risk of Recurrence of HR+ Breast Cancer
Globally, breast cancer is the most frequently diagnosed cancer type, accounting for over two million cases each year. Approximately 4 million
“There is a clear unmet need for an effective non-hormonal treatment for VVA caused by anti-cancer endocrine therapy in patients diagnosed with HR+ breast cancer. Commonly, estrogen-based therapies delivered through creams, intravaginal rings, and vaginal suppositories are prescribed for the treatment of VVA symptoms. However, the use of estrogen-based products for the treatment of VVA in HR+ breast cancer patients can be challenging for both healthcare providers and their patients as the use of estrogen products, in any form, is often contraindicated for this patient population,” said
“We are highly encouraged by the positive topline results of the Phase 1/2 study of DARE-VVA1 as this study is a critical step in developing a potential non-hormonal treatment alternative for VVA,” said Dr.
DARE-VVA1 Phase 1/2 Clinical Trial Study Design
The Phase 1/2 study evaluated different doses of DARE-VVA1, a tamoxifen vaginal insert, in 17 postmenopausal women with VVA. The study was a randomized, multi-center, double-blind, parallel-arm, placebo-controlled, dose-ranging study that evaluated the safety, tolerability, plasma pharmacokinetics (PK) and pharmacodynamics (PD) of DARE-VVA1. Eligible participants were randomly allocated to one of five treatment groups (approximately 4 participants per group) that evaluated four dose levels (1 mg, 5 mg, 10 mg, and 20 mg) and a placebo. Following a screening visit, DARE-VVA1 was self-administered intravaginally once a day for the first two weeks, and then twice a week for the following six weeks for a total treatment period of 56 days. In each treatment group, participants had serial blood sampling for PK analysis and underwent safety evaluations and preliminary assessments of effectiveness. Following the completion of the treatment period, participants attended a safety follow-up visit.
The primary endpoints of the study evaluated the safety and tolerability of DARE-VVA1 by vaginal administration and determined the plasma PK of DARE-VVA1 after intravaginal application. Secondary endpoints evaluated preliminary efficacy and PD of DARE-VVA1 in terms of most bothersome vaginal symptom and changes in vaginal cytology and pH.
The study was conducted by the company’s wholly owned subsidiary in
Topline Results of the Phase 1/2 Clinical Trial
The age of the 17 postmenopausal women with VVA who participated in the study ranged from 49 to 68 years (average age: 60.9). Fourteen women completed the study.
The primary outcomes of this first-in-woman study were safety and plasma PK. Intravaginal administration of DARE-VVA1 was well tolerated and all treatment emergent adverse events were mild or moderate and equally distributed between participants randomized to study drug treatment versus placebo. Concentration of tamoxifen in plasma samples collected over the course of the study did not exceed 10 ng/mL, even in participants in the highest dose group (20 mg), which is 1/10th of the average steady-state concentration of tamoxifen seen with daily dosing of orally administered tamoxifen citrate tablets (20 mg and 10 mg tamoxifen) for three months (average steady-state plasma concentrations of over 100 ng/mL). Secondary outcomes of the study were preliminary efficacy and PD of DARE-VVA1 in terms of most bothersome vaginal symptom and changes in vaginal cytology and pH. Participants who received study drug treatment (at 1 mg, 5 mg, 10 mg or 20 mg doses) had improvements in the assessments and symptoms associated with VVA – specifically, they had decreases in vaginal pH, increases in the percentage of vaginal superficial cells, significant (p=0.04) decreases in the percentage of vaginal parabasal cells (despite the small sample size), and reduction in their self-assessed most bothersome vaginal symptom reported (either vaginal dryness or pain with intercourse).
Regarding the most bothersome vaginal symptom reported, of the participants randomized to receive study drug treatment, 39% (5/13) reported that vaginal dryness and 62% (8/13) reported that pain with intercourse (dyspareunia) was their most bothersome vaginal symptom at baseline. At the end of the treatment period, among the participants randomized to receive study drug treatment who reported vaginal dryness as their most bothersome symptom at baseline (n=5) (moderate or severe), all those who completed the study reported that vaginal dryness was either absent (n=1) or mild (n=3). Among the participants randomized to receive study drug treatment who reported dyspareunia as their most bothersome symptom at baseline (n=8) (moderate or severe), at the end of the treatment period, four reported no longer experiencing dyspareunia, one reported mild dyspareunia, two had no change in this symptom, and one did not complete the study. Of the four participants randomized to the placebo group, two reported vaginal dryness and two reported dyspareunia as their most bothersome symptom at baseline. At the end of the treatment period, the participants randomized to the placebo group who reported vaginal dryness as their most bothersome symptom at baseline (n=2) (moderate or severe), reported that vaginal dryness was either absent (n=1) or mild (n=1), and among the participants randomized to the placebo group who reported dyspareunia as their most bothersome symptom at baseline (n=2), one reported no longer experiencing dyspareunia and one did not complete the study.
Daré plans to submit data from the Phase 1/2 clinical study of DARE-VVA1 for publication in a peer-reviewed publication.
Following clinical development, Daré intends to leverage the existing safety and efficacy data on the active ingredient in DARE-VVA1, tamoxifen, to utilize the
About Vulvar and Vaginal Atrophy (VVA)
VVA is an inflammation and thinning of the vaginal epithelium due to the reduction in levels of circulating estrogen. Typical symptoms include vaginal dryness, itching, burning, and painful intercourse, adversely impacting quality of life. VVA is a common condition in postmenopausal women and women with, or with a history of, HR+ breast cancer. Many breast cancer survivors experience menopausal symptoms irrespective of age as a direct consequence of their cancer treatment. Breast cancer patients treated with aromatase inhibitors refer to VVA as one of the most unpleasant side effects of treatment. The prevalence of VVA in postmenopausal breast cancer patients is estimated to be between 42 and 70 percent.
Products containing estrogen are commonly used to treat VVA. However, the use of estrogen-containing products for the treatment of VVA is often contraindicated for HR+ breast cancer patients and survivors because of the concern that estrogen use will promote recurrence of disease.
DARE-VVA1 is an investigational, proprietary formulation of tamoxifen for intravaginal administration with the potential to be a first-in-category treatment of VVA for women with or at-risk of HR+ breast cancer. Tamoxifen is a well-known and well-characterized selective estrogen receptor modulator (SERM) that has been prescribed by oncologists for decades for the treatment of breast cancer. In breast tissue, tamoxifen acts as an estrogen antagonist. In contrast, in other tissues such as vaginal tissues, tamoxifen has been reported to exert an estrogen-like response on vaginal cytology. Studies of tamoxifen conducted over the last 40 years have documented its estrogen-like effects on vaginal epithelium. Localized tamoxifen therapy such as DARE-VVA1 thus has the potential to counter the physiologic changes that lead to VVA without introducing estrogen back into the system.
About Daré Bioscience
Daré Bioscience is a biopharmaceutical company committed to advancing innovative products for women’s health. The company’s mission is to identify, develop and bring to market a diverse portfolio of differentiated therapies that prioritize women's health and well-being, expand treatment options, and improve outcomes, primarily in the areas of contraception, fertility, and vaginal and sexual health.
Daré’s first FDA-approved product, XACIATO™ (clindamycin phosphate) vaginal gel, 2% is a lincosamide antibacterial indicated for the treatment of bacterial vaginosis in female patients 12 years of age and older, which is under a global license agreement with Organon. XACIATO is a clear, colorless, viscous gel, to be administered once intravaginally as a single dose. Daré’s portfolio also includes potential first-in-category candidates in clinical development: Ovaprene®, a novel, hormone-free monthly intravaginal contraceptive whose
Daré may announce material information about its finances, product and product candidates, clinical trials and other matters using the Investors section of its website (http://ir.darebioscience.com),
Daré cautions you that all statements, other than statements of historical facts, contained in this press release, are forward-looking statements. Forward-looking statements, in some cases, can be identified by terms such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “design,” “intend,” “expect,” “could,” “plan,” “potential,” “predict,” “seek,” “should,” “would,” “contemplate,” “project,” “target,” “objective,” or the negative version of these words and similar expressions. In this press release, forward-looking statements include, but are not limited to, statements relating to DARE-VVA1’s potential as a safe and effective therapy for VVA, DARE-VVA1’s potential to become a new standard of care as the first FDA-approved product for the treatment of VVA specifically in an HR+ breast cancer patient population, the importance of the Phase 1/2 clinical study results to Daré and DARE-VVA1, and the anticipated regulatory approval pathway for DARE-VVA1. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause Daré’s actual results, performance or achievements to be materially different from those expressed or implied by the forward-looking statements in this press release, including, without limitation: the risk that positive findings in early clinical and/or nonclinical studies of a product candidate may not be predictive of success in subsequent clinical and/or nonclinical studies of that candidate; Daré’s ability to develop, obtain FDA or foreign regulatory approval for, and commercialize its product candidates and to do so on communicated timelines; failure or delay in starting, conducting and completing clinical trials of a product candidate; Daré’s ability to design and conduct successful clinical trials, to enroll a sufficient number of patients, to meet established clinical endpoints, to avoid undesirable side effects and other safety concerns, and to demonstrate sufficient safety and efficacy of its product candidates; Daré’s dependence on third parties to conduct clinical trials and manufacture and supply clinical trial material and commercial product; Daré’s ability to raise additional capital when and as needed to advance its product candidates, execute its business strategy and continue as a going concern; the loss of, or inability to attract, key personnel; the effects of the COVID-19 pandemic, macroeconomic conditions and geopolitical events on Daré’s operations, financial results and condition, and ability to achieve current plans and objectives, including the potential impact of the pandemic on Daré’s ability to timely enroll, conduct and report results of its clinical trials and on the ability of third parties on which Daré relies to assist in the conduct of its business to fulfill their contractual obligations to Daré; the risk that developments by competitors make Daré’s product or product candidates less competitive or obsolete; difficulties establishing and sustaining relationships with development and/or commercial collaborators; failure of Daré’s product or product candidates, if approved, to gain market acceptance or obtain adequate coverage or reimbursement from third-party payers; Daré’s ability to retain its licensed rights to develop and commercialize a product or product candidate; Daré’s ability to satisfy the monetary obligations and other requirements in connection with its exclusive, in-license agreements covering the critical patents and related intellectual property related to its product and product candidates; Daré’s ability to adequately protect or enforce its, or its licensor’s, intellectual property rights; the lack of patent protection for the active ingredients in certain of Daré’s product candidates which could expose its products to competition from other formulations using the same active ingredients; product liability claims; governmental investigations or actions relating to Daré’s product or product candidates or the business activities of Daré, its commercial collaborators or other third parties on which Daré relies; the impact of pharmaceutical industry regulation and health care legislation in
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Source: Daré Bioscience, Inc.