FDA Approves Trodelvy in Pre-treated HR+/HER2- Metastatic Breast Cancer

Gilead Sciences, Inc. announced the U.S. Food and Drug Administration (FDA) has approved Trodelvy (sacituzumab govitecan-hziy) for the treatment of adult patients with unresectable locally advanced or metastatic hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)-negative (IHC 0, IHC 1+ or IHC 2+/ISH–) breast cancer who have received endocrine-based therapy and at least two additional systemic therapies in the metastatic setting. The approval is based on statistically significant and clinically meaningful progression-free survival and overall survival data from the Phase 3 TROPiCS-02 study. Trodelvy is now also recommended as a Category 1, preferred treatment for metastatic HR+/HER2- breast cancer by the National Comprehensive Cancer Network (NCCN) as defined in the Clinical Practice Guidelines in Oncology (NCCN Guidelines).

“Despite decades of advances, people living with pre-treated HR+/HER2- metastatic breast cancer need new treatment options. Nearly all people with this type of breast cancer will eventually develop resistance to endocrine-based therapies and progress on available chemotherapies,” said Hope S. Rugo, MD, Professor of Medicine and Director, Breast Oncology and Clinical Trials Education at the UCSF Helen Diller Family Comprehensive Cancer Center, U.S. and principal investigator of the TROPiCS-02 study. “This approval is significant for the breast cancer community. We have had limited options to offer patients after endocrine-based therapy and chemotherapy, and to see a clinically meaningful survival benefit of more than three months with a quality of life benefit for these women is exceptional.”

In the TROPiCS-02 study, Trodelvy demonstrated a statistically significant and clinically meaningful overall survival (OS) benefit of 3.2 months versus comparator single-agent chemotherapy (treatment of physician’s choice; TPC) (median OS: 14.4 months vs. 11.2 months; hazard ratio [HR]=0.79; 95% CI: 0.65-0.96; p=0.02). Trodelvy also demonstrated a 34% reduction in risk of disease progression or death (median PFS: 5.5 versus 4.0 months; HR: 0.66; 95% CI: 0.53-0.83; p=0.0003). Three times as many people treated with Trodelvy were progression free at one year versus those treated with chemotherapy (21% versus 7%). In a post-hoc analysis, data demonstrated Trodelvy’s efficacy across HER2-low and IHC0 status in pre-treated metastatic breast cancer patients in the TROPiCS-02 trial.

Trodelvy also significantly improved additional secondary endpoint measures, including objective response rate and time to deterioration (TTD) assessed by the Global Health Status/Quality of Life and Fatigue scale per EORTC-QLQ-C30. No statistically significant difference in TTD in Pain Scale was observed.

“The FDA approval is an important step forward for both women and men living with metastatic breast cancer, especially for those individuals whose tumor is no longer responding to endocrine-based therapies and who are facing a poor prognosis,” said Laura Carfang, Executive Director, SurvivingBreastCancer.org. “We need to combat this terrible disease, and all options that potentially slow its progress and extend life for those living with metastatic breast cancer are welcomed.”

“We are pleased that Trodelvy could now provide new hope for people living with pre-treated HR+/HER2- metastatic breast cancer, building on the transformative role that Trodelvy is already playing for people with metastatic triple-negative breast cancer,” said Daniel O’Day, Chairman and Chief Executive Officer, Gilead Sciences. “We thank the physicians, patients and their families who put their trust in the TROPiCS-02 study and helped make this milestone possible.”

The safety profile for Trodelvy was consistent with prior studies, with no new safety signals identified in this patient population. In TROPiCS-02 the most frequent serious adverse reactions (>1%) were diarrhea (5%), febrile neutropenia (4%), neutropenia (3%), abdominal pain, colitis, neutropenic colitis, pneumonia, and vomiting (each 2%). The most common Grade 3-4 lab abnormalities (incidence ≥25%) in the TROPiCS-02 study were reduced neutrophils and leukocytes. No patients treated with Trodelvy experienced interstitial lung disease.

This review by the FDA was conducted under Project Orbis and granted Priority Review.

The European Medicines Agency has also validated a Type II Variation Marketing Authorization Application for Trodelvy in HR+/HER2- metastatic breast cancer.

Trodelvy has a Boxed Warning for severe or life-threatening neutropenia and severe diarrhea.