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Independent Data Monitoring Committee (IDMC) Recommends CONTESSA Continue with No Modifications following Planned Interim Efficacy Futility Analysis

SAN DIEGO--(BUSINESS WIRE)--

Odonate Therapeutics, Inc. (ODT), a pharmaceutical company dedicated to the development of best-in-class therapeutics that improve and extend the lives of patients with cancer, today announced that the IDMC for CONTESSA, Odonate’s Phase 3 study investigating tesetaxel as a potential treatment for patients with HER2 negative, hormone receptor positive metastatic breast cancer, recommended that the study continue with no modifications following a planned interim efficacy futility analysis. The interim efficacy futility analysis was based on a pre-specified analysis of the first approximate 100 progression-free survival (PFS) events that occurred in the study. PFS is the primary endpoint of CONTESSA. The purpose of the interim efficacy futility analysis was to facilitate the early termination of the study if the IDMC determined that achieving a positive outcome on the primary endpoint would be futile. Odonate continues to expect to complete enrollment of CONTESSA in the second half of 2019 and to report topline results in 2020.

About Tesetaxel

Tesetaxel is an investigational, orally administered chemotherapy agent that belongs to a class of drugs known as taxanes, which are widely used in the treatment of cancer. Tesetaxel has several pharmacologic properties that make it unique among taxanes, including: oral administration with a low pill burden; a long (~8-day) terminal plasma half-life in humans, enabling the maintenance of adequate drug levels with relatively infrequent dosing; no history of hypersensitivity (allergic) reactions; and significant activity against chemotherapy-resistant tumors. In patients with metastatic breast cancer, tesetaxel was shown to have significant, single-agent antitumor activity in two multicenter, Phase 2 studies. Tesetaxel currently is the subject of multiple studies in breast cancer, including a multinational, multicenter, randomized, Phase 3 study in patients with metastatic breast cancer, known as CONTESSA.

About CONTESSA

CONTESSA is a multinational, multicenter, randomized, Phase 3 study of tesetaxel, an investigational, orally administered taxane, in patients with metastatic breast cancer (MBC). CONTESSA is comparing tesetaxel dosed orally at 27 mg/m2 on the first day of each 21-day cycle plus a reduced dose of capecitabine (1,650 mg/m2/day dosed orally for 14 days of each 21-day cycle) to the approved dose of capecitabine alone (2,500 mg/m2/day dosed orally for 14 days of each 21-day cycle) in approximately 600 patients randomized 1:1 with human epidermal growth factor receptor 2 (HER2) negative, hormone receptor (HR) positive MBC previously treated with a taxane in the neoadjuvant or adjuvant setting. Capecitabine is an oral chemotherapy agent that is considered a standard-of-care treatment in MBC. Where indicated, patients must have received endocrine therapy with or without a cyclin-dependent kinase (CDK) 4/6 inhibitor. The primary endpoint is progression-free survival (PFS) as assessed by an Independent Radiologic Review Committee (IRC). CONTESSA’s secondary efficacy endpoints are overall survival (OS), objective response rate (ORR) as assessed by the IRC and disease control rate (DCR) as assessed by the IRC. To learn more, please visit www.contessastudy.com.

About Odonate Therapeutics, Inc.

Odonate Therapeutics, Inc. is a pharmaceutical company dedicated to the development of best-in-class therapeutics that improve and extend the lives of patients with cancer. Odonate’s initial focus is on the development of tesetaxel, an investigational, orally administered chemotherapy agent that belongs to a class of drugs known as taxanes, which are widely used in the treatment of cancer. Odonate’s goal for tesetaxel is to develop an effective chemotherapy choice for patients that provides quality-of-life advantages over current alternatives. To learn more, please visit www.odonate.com.

Forward-looking Statements

This press release contains "forward-looking statements" as defined by the Private Securities Litigation Reform Act of 1995. We caution investors that forward-looking statements are based on management’s expectations and assumptions as of the date of this press release and involve substantial risks and uncertainties that could cause the actual outcomes to differ materially from what we currently expect. These risks and uncertainties include, but are not limited to, those associated with: the expected outcome of CONTESSA, our Phase 3 study of tesetaxel in patients with metastatic breast cancer (MBC); the expected outcome of our other clinical studies, including CONTESSA 2 and CONTESSA TRIO; our ability to obtain regulatory approval of tesetaxel; the unpredictable relationship between preclinical study results and clinical study results; and other risks and uncertainties identified in our filings with the U.S. Securities and Exchange Commission. Forward-looking statements in this press release apply only as of the date made, and we undertake no obligation to update or revise any forward-looking statements to reflect subsequent events or circumstances.

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