Trodelvy® Demonstrates Superior Outcomes to Standard of Care in Second-Line Treatment of Metastatic Triple-Negative Breast Cancer in Phase 3 ASCENT Study

– Trodelvy More than Doubled Overall Survival as Second-Line Treatment in New ASCENT Subgroup Analysis

FOSTER CITY, CA, USA I June 04, 2021 I Gilead Sciences, Inc. (Nasdaq: GILD) today announced new data from the Phase 3 ASCENT study evaluating Trodelvy® (sacituzumab govitecan-hziy) in relapsed or refractory metastatic triple-negative breast cancer (TNBC). In this subgroup analysis of brain metastases-negative patients who received only one line of prior systemic therapy in the metastatic setting in addition to having disease recurrence or progression within 12 months of (neo)adjuvant chemotherapy, Trodelvy improved progression-free survival (PFS), with a 59% reduction in the risk of disease worsening or death (HR: 0.41; 95% CI: 0.22-0.76) and a median PFS of 5.7 months (n=33) versus 1.5 months with chemotherapy (n=32). Trodelvy also extended median overall survival to 10.9 months versus 4.9 months with chemotherapy (HR: 0.51; 95% CI: 0.28-0.91). The results were presented at the 2021 American Society of Clinical Oncology (ASCO) Annual Meeting (Abstract #1080).

“In patients with relapsed or refractory metastatic triple-negative breast cancer, outcomes are typically poor – especially among patients who progress within 12 months of (neo)adjuvant chemotherapy,” said Lisa Carey, MD, Medical Director of the UNC Breast Center, the Physician-in-Chief of the North Carolina Cancer Hospital and Associate Director of Clinical Research at UNC Lineberger Comprehensive Cancer Center. “In the Phase 3 ASCENT study, Trodelvy was the first treatment to demonstrate a proven survival advantage in pre-treated patients with locally advanced or metastatic TNBC, and the analysis presented at ASCO reaffirms this benefit over standard of care with important new data in the second-line setting.”

Additional results showed Trodelvy demonstrated a higher overall response rate compared with chemotherapy (30% versus 3%). Efficacy results from this subgroup were consistent with those observed in the overall ASCENT study population.

The safety profile of Trodelvy in this subgroup was consistent with prior reports. The most frequent Grade ≥3 treatment-related adverse reactions for Trodelvy compared to chemotherapy were neutropenia (61% versus 21%), leukopenia (9% versus 0%), diarrhea (6% versus 0%), anemia (3% versus 6%), and fatigue (3% versus 0%). One patient in this subgroup who received Trodelvy experienced febrile neutropenia. Adverse reactions leading to treatment discontinuation were low across both groups (6% in each). There were no treatment-related deaths with Trodelvy in this subgroup. The Trodelvy U.S. Prescribing Information has a BOXED WARNING for severe or life-threatening neutropenia and severe diarrhea; see below for Important Safety Information.

“With Trodelvy, we continue to challenge the standard of care in locally advanced and metastatic TNBC. The efficacy observed in the second-line metastatic setting with Trodelvy is highly meaningful, since many patients will progress quickly following chemotherapy. Among these patients, we see median overall survival more than doubled where need is particularly great,” said Daejin Abidoye, MD, Senior Vice President, Head of Oncology Clinical Development, Gilead Sciences. “We are committed to improving the prognosis for people with this aggressive cancer, and as we continue to study Trodelvy, we are encouraged by this proven efficacy in TNBC.”

Two additional ASCENT subgroup analyses that support the efficacy benefit of Trodelvy were also presented at the meeting – one evaluating Trodelvy efficacy by patients’ age (Abstract #1011) and the other comparing Trodelvy with specific single-agent chemotherapy chosen by the patients’ treating physicians (Abstract #1077).

About Triple-Negative Breast Cancer (TNBC)

TNBC is an aggressive type of breast cancer, accounting for approximately 15% of all breast cancers. The disease is diagnosed more frequently in younger and premenopausal women and is more prevalent in African American and Hispanic women. TNBC cells do not have estrogen and progesterone receptors and have limited HER2. Medicines targeting these receptors therefore are not typically effective in treating TNBC.

About the ASCENT Study

The Phase 3 ASCENT study, an open-label, active-controlled, randomized confirmatory trial, enrolled more than 500 patients with relapsed/refractory metastatic triple-negative breast cancer who had received two or more prior systemic therapies, including a taxane, at least one of them for metastatic disease. Patients were randomized to receive either Trodelvy or a chemotherapy chosen by the patients’ treating physicians. The primary efficacy outcome was PFS in patients without brain metastases at baseline, as measured by a blinded, independent, centralized review using RECIST v1.1 criteria. Additional efficacy measures included PFS for the full population, including all patients with and without brain metastases, and overall survival. More information about ASCENT is available at

About Trodelvy

Trodelvy (sacituzumab govitecan-hziy) is a first-in-class antibody and topoisomerase inhibitor conjugate directed to the Trop-2 receptor, a protein frequently expressed in multiple types of epithelial tumors, including metastatic triple-negative breast cancer and metastatic urothelial cancer, where high expression is associated with poor survival and relapse.

In the U.S., Trodelvy is indicated for the treatment of:

  • Adult patients with unresectable locally advanced or metastatic triple-negative breast cancer who have received two or more prior systemic therapies, at least one of them for metastatic disease.
  • Adult patients with locally advanced or metastatic urothelial cancer who have previously received a platinum-containing chemotherapy and either programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor.

Beyond the regulatory approvals of Trodelvy in the U.S., regulatory reviews for Trodelvy in metastatic triple-negative breast cancer are currently underway in the EU, U.K., Canada, Switzerland and Australia, as well as in Singapore through our partner Everest Medicines. Trodelvy is also being investigated as potential treatment for hormone receptor-positive/human epidermal growth factor receptor 2-negative (HR+/HER2-) metastatic breast cancer and metastatic non-small cell lung cancer. Additional evaluation across multiple solid tumors is also underway.

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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