Trodelvy® Significantly Improved Overall Survival in Pre-Treated HR+/HER2- Metastatic Breast Cancer Patients in TROPiCS-02 Study

-- 3.2 Month Survival Benefit Demonstrated in Patients who had Already Received Prior Endocrine-based Therapy and at Least Two Prior Chemotherapies --

-- Trodelvy Now Shows a Survival Benefit in both Pre-treated HR+/HER2- Metastatic Breast Cancer and Second-Line Metastatic Triple-Negative Breast Cancer --

FOSTER CITY, CA, USA I September 07, 2022 I Gilead Sciences, Inc. (Nasdaq: GILD) today announced the positive overall survival (OS) results from the Phase 3 TROPiCS-02 study evaluating Trodelvy® (sacituzumab govitecan-hziy) versus comparator chemotherapy (physicians’ choice of chemotherapy, TPC) in patients with HR+/HER2- metastatic breast cancer who received endocrine-based therapies and at least two chemotherapies. In the study, Trodelvy demonstrated a statistically significant and clinically meaningful improvement of 3.2 months in OS compared to TPC (median OS: 14.4 months vs. 11.2 months; hazard ratio [HR]=0.79; [95% confidence interval [CI]: 0.65-0.96]; p=0.02). OS was a key secondary endpoint of the trial.

These findings will be presented on Friday, September 9 at 4:20pm CEST during the European Society for Medical Oncology (ESMO) Congress 2022 as a late-breaking oral presentation (#LBA76) in the Brest Auditorium, Paris Expo Porte de Versailles.

Other key secondary endpoints including objective response rate (ORR) demonstrated statistically significant improvement in favoring Trodelvy versus TPC. Time to deterioration (TTD) of Global Health Status/Quality of Life (QoL) and Fatigue scale per EORTC-QLQ-C30 also favored Trodelvy versus TPC (QoL: 4.3 months vs. 3.0 months, p=0.006; Fatigue: 2.2 months vs. 1.4 months, p=0.002). No statistically significant difference in TTD on the Pain Scale was observed.

“It is outstanding to see a clinically meaningful survival benefit of over three months for patients with pre-treated HR+/HER2- metastatic breast cancer,” said Hope S. Rugo, MD, Professor of Medicine and Director, Breast Oncology and Clinical Trials Education at the University of California San Francisco Comprehensive Cancer Center, U.S. “Nearly all patients with HR+/HER2- metastatic breast cancer will develop resistance to endocrine-based therapies even in combination with targeted agents, so these data are welcome news for the breast cancer community. The results of TROPiCS-02 highlight the potential for sacituzumab govitecan in patients with pre-treated HR+/HER2- metastatic breast cancer.”

The safety profile for Trodelvy was consistent with prior studies, with no new safety signals identified in this patient population.

“With these data from TROPiCS-02, Trodelvy has now demonstrated a survival benefit in both pre-treated HR+/HER2- metastatic breast cancer and second-line metastatic TNBC – two difficult-to-treat forms of breast cancer,” said Bill Grossman, MD, PhD, Senior Vice President, Therapeutic Area Head, Gilead Oncology. “Our Gilead Oncology ambition is to transform care for people with cancer, and the meaningful improvement in survival benefit seen in the TROPiCS-02 study with Trodelvy is another step forward in pursuing this ambition for patients.”

The TROPiCS-02 study met its primary endpoint of progression-free survival earlier this year; detailed results were presented during the 2022 American Society of Clinical Oncology (ASCO) Annual Meeting.

Trodelvy has not been approved by any regulatory agency for the treatment of HR+/HER2- metastatic breast cancer. Its safety and efficacy have not been established for this indication. Gilead has submitted a supplemental Biologics License Application (sBLA) to the U.S. Food and Drug Administration (FDA) based on data from TROPiCS-02; these data will also be shared with health authorities outside the U.S.

Sacituzumab govitecan-hziy is currently included in the National Comprehensive Cancer Network® (NCCN®) Clinical Practice Guidelines in Oncology (NCCN Guidelines®)i. This includes a Category 1 recommendation for use in adult patients with second-line metastatic triple-negative breast cancer (defined as those who received at least two prior therapies, with at least one line for metastatic disease). It also has a Category 2A preferred recommendation for investigational use in HR+/HER2- advanced breast cancer after prior treatment including endocrine therapy, a CDK4/6 inhibitor and at least two lines of chemotherapy.

Trodelvy has a Boxed Warning for severe or life-threatening neutropenia and severe diarrhea; please see below for additional Important Safety Information.

About HR+/HER2- Breast Cancer

Hormone receptor-positive/human epidermal growth factor receptor 2-negative (HR+/HER2-) breast cancer is the most common type of breast cancer and accounts for approximately 70% of all new cases, or nearly 400,000 diagnoses worldwide each year. Almost one in three cases of early-stage breast cancer eventually become metastatic, and among patients with HR+/HER2- metastatic disease, the five-year relative survival rate is 30%. As patients with HR+/HER2- metastatic breast cancer become resistant to endocrine-based therapy, their primary treatment option is limited to single-agent chemotherapy. In this setting, it is common to receive multiple lines of chemotherapy regimens over the course of treatment, and the prognosis remains poor.

About the TROPiCS-02 Study

The TROPiCS-02 study is a global, multicenter, open-label, Phase 3 study, randomized 1:1 to evaluate Trodelvy versus physicians’ choice of chemotherapy (eribulin, capecitabine, gemcitabine, or vinorelbine) in 543 patients with HR+/HER2- metastatic breast cancer who were previously treated with endocrine therapy, CDK4/6 inhibitors and two to four lines of chemotherapy for metastatic disease. The primary endpoint is progression-free survival per Response Evaluation Criteria in Solid Tumors (RECIST 1.1) as assessed by blinded independent central review (BICR) for participants treated with Trodelvy compared to those treated with chemotherapy. Secondary endpoints include overall survival, overall response rate, clinical benefit rate and duration of response, as well as assessment of safety and tolerability and quality of life measures. In the study, HER2 negativity was defined per American Society of Clinical Oncology (ASCO) and the College of American Pathologists (CAP) criteria as immunohistochemistry (IHC) score of 0, IHC 1+ or IHC 2+ with a negative in-situ hybridization (ISH) test. More information about TROPiCS-02 is available at https://clinicaltrials.gov/ct2/show/NCT03901339.

About Trodelvy

Trodelvy® (sacituzumab govitecan-hziy) is a first-in-class Trop-2 directed antibody-drug conjugate. Trop-2 is a cell surface antigen highly expressed in multiple tumor types, including in more than 90% of breast and bladder cancers. Trodelvy is intentionally designed with a proprietary hydrolyzable linker attached to SN-38, a topoisomerase I inhibitor payload. This unique combination delivers potent activity to both Trop-2 expressing cells and the microenvironment.

Trodelvy is approved in more than 35 countries, with multiple additional regulatory reviews underway worldwide, for the treatment of adult patients with unresectable locally advanced or metastatic triple-negative breast cancer (TNBC) who have received two or more prior systemic therapies, at least one of them for metastatic disease. Trodelvy is also approved in the U.S. under the accelerated approval pathway for the treatment of adult patients with locally advanced or metastatic urothelial cancer (UC) who have previously received a platinum-containing chemotherapy and either programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor.

Trodelvy is also being developed for potential investigational use in other TNBC and metastatic UC populations, as well as a range of tumor types where Trop-2 is highly expressed, including hormone receptor-positive/human epidermal growth factor receptor 2-negative (HR+/HER2-) metastatic breast cancer, metastatic non-small cell lung cancer (NSCLC), metastatic small cell lung cancer (SCLC), head and neck cancer, and endometrial cancer.

U.S. Indications for Trodelvy

In the United States, Trodelvy is indicated for the treatment of:

  • Adult patients with unresectable locally advanced or metastatic TNBC who have received two or more prior systemic therapies, at least one of them for metastatic disease.
  • Adult patients with locally advanced or metastatic UC who have previously received a platinum-containing chemotherapy and either programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor. This indication is approved under accelerated approval based on tumor response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial.

Please see full Prescribing Information, including BOXED WARNING.

About Gilead Sciences

Gilead Sciences, Inc. is a biopharmaceutical company that has pursued and achieved breakthroughs in medicine for more than three decades, with the goal of creating a healthier world for all people. The company is committed to advancing innovative medicines to prevent and treat life-threatening diseases, including HIV, viral hepatitis and cancer. Gilead operates in more than 35 countries worldwide, with headquarters in Foster City, California.

SOURCE: Gilead Sciences

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