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  • Positive result of...

Positive result of Enhertu in DESTINY-Breast04 trial: AstraZeneca

Ruchika SharmaWritten by Ruchika Sharma Published On 2022-02-22T11:30:55+05:30  |  Updated On 22 Feb 2022 3:36 PM IST
Positive result of Enhertu in DESTINY-Breast04 trial: AstraZeneca
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UK: In a significant development, AstraZeneca has announced the positive high-level results from the pivotal DESTINY-Breast04 Phase III trial. The trial showed that Enhertu (trastuzumab deruxtecan) demonstrated a statistically significant and clinically meaningful improvement in both progression-free survival (PFS) and overall survival (OS) in patients with HER2-low unresectable and/or metastatic breast cancer regardless of hormone receptor (HR) status versus physician's choice of chemotherapy.

Enhertu is a HER2-directed antibody drug conjugate (ADC) being jointly developed by AstraZeneca and Daiichi Sankyo.
All patients in the trial received a HER2 test, and the results were centrally confirmed. HER2- low status was defined as an immunohistochemistry (IHC) score of 1+ or IHC 2+ with a negative in-situ hybridisation (ISH) score.
Up to 55% of all patients with breast cancer have tumours with a HER2 IHC score of 1+, or 2+ in combination with a negative ISH test, a level of HER2 expression not currently eligible for HER2-targeted therapy. HER2-low expression occurs in both HR-positive and HR- negative disease.
HER2 testing is well established to determine an appropriate treatment strategy in metastatic breast cancer. Targeting the lower range of HER2 expression may offer another approach to delay disease progression and extend survival in patients with metastatic breast cancer.
Currently, chemotherapy remains the only treatment option both for patients with HR-positive tumours following progression on endocrine (hormone) therapy, and for those who are HR- negative.
DESTINY-Breast04 met its primary endpoint, where Enhertu demonstrated superior PFS in previously treated patients with HR-positive HER2-low metastatic breast cancer compared to the standard-of-care chemotherapy. The trial met the key secondary endpoint of PFS in patients with HER2-low metastatic breast cancer regardless of HR status (HR-positive or HR-negative). The trial also met the key secondary endpoints of OS in patients with HR- positive disease and in patients regardless of HR status at interim analysis.
The safety profile of Enhertu was consistent with previous clinical trials, with no new safety concerns identified. Overall interstitial lung disease (ILD) rates were consistent with that observed in late-line HER2-positive breast cancer trials of Enhertu, with a lower rate of Grade 5 ILD observed as determined by an independent adjudication committee.
Susan Galbraith, Executive Vice President, Oncology R&D, AstraZeneca said: "Today's historic news from DESTINY-Breast04 could reshape how breast cancer is classified and treated. A HER2-directed therapy has never-before shown a benefit in patients with HER2- low metastatic breast cancer. These results for Enhertu are a huge step forward and could potentially expand our ability to target the full spectrum of HER2 expression, validating the need to change the way we categorise and treat breast cancer."
Ken Takeshita, Global Head, R&D, Daiichi Sankyo said: "Enhertu continues to redefine the treatment of HER2-targetable cancers. DESTINY-Breast04 is the first ever Phase III trial of a HER2-directed therapy in patients with HER2-low metastatic breast cancer to show statistically significant and clinically meaningful benefit in progression-free and overall survival compared to standard treatment. We look forward to sharing the detailed findings of DESTINY-Breast04 with the medical community and initiating discussions with regulatory agencies globally with the goal of bringing Enhertu to patients with metastatic breast cancer previously considered to be HER2-negative."
The data will be presented at a forthcoming medical meeting and shared with global health authorities.
Enhertu (5.4mg/kg) is approved in more than 40 countries for the treatment of adult patients with unresectable or metastatic HER2-positive breast cancer who have received two or more prior anti-HER2-based regimens based on the results from the DESTINY-Breast01 trial.
Enhertu is being further assessed in a comprehensive clinical development programme evaluating efficacy and safety across multiple HER2-targetable cancers, including breast, gastric, lung and colorectal cancers.
Read also: USFDA to allow export of AstraZeneca COVID vaccine lots made at Emergent facility


astrazenecaastrazeneca newsenhertuher2-low metastatic breast cancer
Ruchika Sharma
Ruchika Sharma

    Ruchika Sharma joined Medical Dialogue as an Correspondent for the Business Section in 2019. She covers all the updates in the Pharmaceutical field, Policy, Insurance, Business Healthcare, Medical News, Health News, Pharma News, Healthcare and Investment. She has completed her B.Com from Delhi University and then pursued postgraduation in M.Com. She can be contacted at editorial@medicaldialogues.in Contact no. 011-43720751

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