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

Trodelvy is the First TROP-2 Directed ADC to Show a Significant Improvement in Overall Survival in HR+/HER2- Breast Cancer

Planned Second Interim Analysis Demonstrated a Statistically Significant and Clinically Meaningful Benefit for Overall Survival

FOSTER CITY, CA, USA I August 15, 2022 I Gilead Sciences, Inc. (Nasdaq: GILD) today announced statistically significant and clinically meaningful results from the second interim analysis of the key secondary endpoint of overall survival (OS) in the Phase 3 TROPiCS-02 study evaluating Trodelvy® (sacituzumab govitecan-hziy) in patients with HR+/HER2- metastatic breast cancer who received prior endocrine therapy, CDK4/6 inhibitors and two to four lines of chemotherapy. Detailed OS results will be presented at an upcoming medical conference. The safety profile for Trodelvy was consistent with prior studies, and no new safety signals emerged in this patient population.

“These survival results from the TROPiCS-02 study are important for the breast cancer community and we are encouraged by the potential this may have in helping patients who otherwise have limited alternatives,” said Merdad Parsey, MD, PhD, Chief Medical Officer, Gilead Sciences. “We look forward to discussing these results with global health authorities, as pre-treated HR+/HER2- metastatic disease patients currently have limited treatment options and poor quality of life.”

Gilead has submitted a supplemental Biologics License Application (sBLA) to the U.S. Food & Drug Administration (FDA). These data will also be shared with health authorities outside the U.S.

In June 2022, based on the positive primary results from the TROPiCS-02 study presented at the 2022 American Society of Clinical Oncology (ASCO) Annual Meeting, the National Comprehensive Cancer Network® (NCCN®) Clinical Practice Guidelines in Oncology (NCCN Guidelines®)i included a category 2A preferred recommendation for sacituzumab govitecan-hziy for the investigational use in patients with HR+/HER2- advanced breast cancer after prior treatment including endocrine therapy, a CDK4/6 inhibitor and at least two lines of chemotherapy. The TROPiCS-02 study enrolled HR+/HER2- metastatic breast cancer patients, which included patients with HER2-low and IHC 0 status.

TROPiCS-02 is an event driven study with planned analyses based on a pre-specified number of events. This interim analysis was executed based on the pre-specified criteria.

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. 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.

i Referenced with permission from the NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines®) for Breast Cancer Version 4.2022. © National Comprehensive Cancer Network, Inc. 2022. All rights reserved. Accessed August 2022. To view the most recent and complete version of the guideline, go online to NCCN.org. NCCN makes no warranties of any kind whatsoever regarding their content, use or application and disclaims any responsibility for their application or use in any way.

SOURCE: Gilead Sciences

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