Trodelvy significantly improved progression-free survival (PFS) and overall survival (OS) in previously-treated brain metastasis negative patients with advanced mTNBC
The safety profile of Trodelvy was consistent with the FDA-approved label and no new safety signals were observed
Trodelvy is the first antibody-drug conjugate (ADC) shown to improve clinical outcomes in people with relapsed or refractory mTNBC who have received two prior therapies
sBLA submission seeking full approval planned for later this year
Immunomedics, Inc. (NASDAQ: IMMU) (“Immunomedics” or the “Company”), a leading biopharmaceutical company in the area of antibody-drug conjugates, today announced that the confirmatory Phase 3 ASCENT study of Trodelvy (sacituzumab govitecan-hziy) met its primary endpoint of progression-free survival (PFS), as well as key secondary endpoints in brain metastasis negative patients with mTNBC who have previously received at least two prior therapies for metastatic disease.
“The results of the global Phase 3 ASCENT study confirm our initial observations that sacituzumab govitecan has the potential to change the standard management of mTNBC. Based on these data, sacituzumab govitecan has set a new benchmark in scientific and clinical innovation for patients with mTNBC by offering a novel alternative to the common drugs currently in clinical practice. Importantly, the ASCENT topline data also validate the manageable safety profile of sacituzumab govitecan, rendering it a good partner candidate for combination with other therapies, including immunotherapy,” stated the study principal investigator, Aditya Bardia, MD, MPH, Director of Precision Medicine at the Center for Breast Cancer, Mass General Cancer Center and Assistant Professor of Medicine at Harvard Medical School.
In the ASCENT study, Trodelvy demonstrated a statistically significant improvement in the primary endpoint of PFS compared to chemotherapy, with a hazard ratio of 0.41 (95% confidence interval (CI), 0.32-0.52). The median PFS for patients treated with Trodelvy was 5.6 months (95% CI, 4.3-6.3), compared to 1.7 months (95% CI, 1.5-2.6) for chemotherapy (p<0.0001). Trodelvy also met key secondary endpoints of the study, including overall survival and objective response rate. The safety profile of Trodelvy observed in the ASCENT study remained consistent with the U.S. Food and Drug Administration (FDA)-approved label, with neutropenia and diarrhea as the most common Grade 3 or 4 adverse events and no new safety signals were observed. Full results will be presented at an upcoming medical conference.
“Given the poor prognosis associated with mTNBC, we are excited that Trodelvy demonstrated improved clinical outcomes for these patients,” said Dr. Loretta M. Itri, Chief Medical Officer of Immunomedics. “We are grateful to all the patients, their families and healthcare providers, as well as our colleagues at Immunomedics, who participated in the ASCENT study and overcame many obstacles, including the COVID-19 pandemic, to complete the collection and analyses of these important data. We look forward to presenting full results at an upcoming medical conference, as well as sharing them with the FDA in support of the full approval of Trodelvy in this difficult-to-treat cancer.”
Trodelvy was recently approved by the FDA as a third-line treatment for adult patients with mTNBC under the agency’s Accelerated Approval Program based on the objective response rate and duration of response observed in a single-arm, multicenter Phase 2 study. The Phase 3 confirmatory ASCENT study was designed under an FDA Special Protocol Assessment (SPA) to validate the promising safety and efficacy activity of Trodelvy that supported its accelerated approval.
“It is gratifying to see the final confirmatory results of Trodelvy in a randomized study supporting the previously reported Phase 2 data that formed the basis of the accelerated approval of Trodelvy. These results provide important additional information for patients and their treating physicians to understand the definitive benefits they are deriving,” commented Dr. Behzad Aghazadeh, Executive Chairman of Immunomedics. “Importantly, the strong ASCENT data reinforce the promise of our unique ADC technology and embolden us to continue our work to change the treatment paradigm for patients with difficult-to-treat cancers.”
Trodelvy carries a black box warning for severe neutropenia and severe diarrhea. The most common adverse reactions occurring in 25 or more percent of patients included nausea, neutropenia, diarrhea, fatigue, anemia, vomiting, alopecia, constipation, decreased appetite, rash and abdominal pain. The most common Grade 3 or 4 adverse events occurring in more than 5 percent of patients were neutropenia, white blood cell count decreased, anemia, hypophosphatemia, diarrhea, fatigue, nausea and vomiting. Two percent of patients discontinued treatment due to adverse events. There were no deaths related to treatment and no severe cases of neuropathy or interstitial lung disease.1
The international, open-label confirmatory Phase 3 study enrolled more than 500 patients with metastatic triple-negative breast cancer who had received at least two prior therapies for metastatic disease. Patients were randomized to receive either Trodelvy or a physician’s choice of chemotherapy. The primary endpoint of the study was progression-free survival. Secondary endpoints include overall survival, objective response rate, duration of response, time to onset of response, and other measures of safety and tolerability. More information about ASCENT is available at http://clinicaltrials.gov/show/NCT02574455.
Trodelvy (sacituzumab govitecan-hziy) is the lead product and the most advanced program in Immunomedics’ unique antibody-drug conjugate (ADC) platform. Trodelvy is an ADC that is directed against Trop-2, a cell-surface protein expressed in many solid cancers. Trodelvy binds to Trop-2 and delivers the anti-cancer drug, SN-38, to kill cancer cells. Immunomedics has an extensive development program for Trodelvy, including multiple ongoing studies in triple-negative breast cancer, metastatic urothelial cancer, hormone receptor-positive/human epidermal growth factor receptor 2-negative metastatic breast cancer, and metastatic non-small cell lung cancer, either as a monotherapy or in combination with other agents. Visit https://www.trodelvy.com/ for more information.
About triple-negative breast cancer (TNBC)
TNBC is an aggressive type of breast cancer, accounting for up to 20 percent of all breast cancers. The disease is diagnosed more frequently in younger and premenopausal women and is highly prevalent in African American and Hispanic women. TNBC cells do not have estrogen or progesterone hormone receptors, or very much of the human epidermal growth factor receptor 2 – hence the term triple negative. This means that medicines that target these receptors are not typically effective in TNBC. There is currently no approved standard of care for people with previously-treated mTNBC.
Immunomedics is a leader in next-generation antibody-drug conjugate (ADC) technology, committed to help transform the lives of people with hard-to-treat cancers. Our proprietary ADC platform centers on using a novel linker that does not require an enzyme to release the payload to deliver an active drug inside the tumor cell and the tumor microenvironment, thereby producing a bystander effect. Trodelvy, our lead ADC, is the first ADC the FDA has approved for the treatment of people with metastatic triple-negative breast cancer and is also the first FDA-approved anti-Trop-2 ADC. For additional information on the Company, please visit its website at https://immunomedics.com/. The information on its website does not, however, form a part of this press release.
Barbara Jacoby is an award winning blogger that has contributed her writings to multiple online publications that have touched readers worldwide.