Approval based on DESTINY-Breast04 results where AstraZeneca and Daiichi Sankyo’s Enhertu reduced the risk of disease progression or death by 50% and increased overall survival by more than 6 months vs. chemotherapy
LONDON, UK I January 26, 2023 I AstraZeneca and Daiichi Sankyo’s Enhertu (trastuzumab deruxtecan) has been approved in the European Union (EU) as monotherapy for the treatment of adult patients with unresectable or metastaticHER2-low (IHC 1+ or IHC 2+/ISH-) breast cancer who have received prior chemotherapy in the metastatic setting or developed disease recurrence during or within six months of completing adjuvant chemotherapy.
The approval by the European Commission follows the positive opinion of the Committee for Medicinal Products for Human Use and is based on results from the DESTINY-Breast04 Phase III trial, which were presented at the American Society of Clinical Oncology 2022 Annual Meeting and published in The New England Journal of Medicine.1
In the trial, Enhertu significantly reduced the risk of disease progression or death by 50% versus physician’s choice of chemotherapy (based on a hazard ratio [HR] of 0.50; 95% confidence interval [CI]: 0.40-0.63; pEnhertu versus 5.1 months in those treated with chemotherapy, as assessed by blinded independent central review (BICR). A 36% reduction in the risk of death was seen with Enhertu compared to chemotherapy (hazard ratio of 0.64; 95% CI: 0.49-0.84; p=0.001) with a median overall survival (OS) of 23.4 months versus 16.8 months.
Javier Cortés, MD, PhD, Head, International Breast Cancer CenterBreast Cancer Center, Barcelona, Spain, said: “The European approval of Enhertu in the HER2-low metastatic breast cancerHER2-low metastatic breast cancer population marks the first time we will have the opportunity to treat patients with lower levels of HER2 expression with a HER2-directed therapy. Enhertu has shown a significant improvement in outcomes compared to chemotherapy for these patients, reinforcing its potential to become a new standard of care.”
Dave Fredrickson, Executive Vice President, Oncology Business Unit, AstraZeneca, said: “Historically, patients with breast cancer who have tumours with low levels of HER2 expression have been classified as HER2-negative, giving them limited treatment options beyond chemotherapy. This approval reinforces the important role Enhertu may have for patients with HER2-low diseaseHER2-low disease and highlights the need to evolve the way breast cancer is treated to improve patient outcomes.”
Ken Keller, Global Head of Oncology Business, and President and CEO, Daiichi Sankyo, Inc, said: “The approval of Enhertu in HER2-low metastatic breast cancerHER2-low metastatic breast cancer represents a significant clinical advance for patients in Europe with both HR-positive and HR-negative disease who previously have had limited treatment options in the late-line setting. This milestone also supports our vision to bring Enhertu to more patients across the HER2 spectrum, which requires a change to the breast cancer classification system that has been guiding treatment for more than two decades.”
The safety profile observed in patients treated with Enhertu in the DESTINY-Breast04 trial was consistent with that seen in other trials of Enhertu in breast cancer with no new safety signals identified.
Financial considerations
Following EU approval, an amount of $150m is due from AstraZeneca to Daiichi Sankyo as a milestone payment for this HER2-low breast cancerHER2-low breast cancer post-chemotherapy indication. The milestone payment will be capitalised as an addition to the upfront payment made by AstraZeneca to Daiichi Sankyo in 2019 and subsequent capitalised milestones.
Sales of Enhertu in most EU territories are recognised by Daiichi Sankyo. AstraZeneca reports its share of gross profit margin from Enhertu sales in those territories as collaboration revenue in the Company’s financial statements. AstraZeneca will record product sales in respect of sales made in territories where AstraZeneca is the selling party.
Further details on the financial arrangements were set out in the March 2019 announcement of the collaboration.
Breast cancer is the most common cancer and is one of the leading causes of cancer-related deaths worldwide.2 More than two million patients with breast cancer were diagnosed in 2020 with nearly 685,000 deaths globally.2 In Europe, approximately 531,000 breast cancer patients are diagnosed annually with around 141,000 deaths.3
HER2 expression is determined by an immunohistochemistry (IHC) test which estimates the amount of HER2 protein on a cancer cell, and/or an in situ hybridisation (ISH) test, which counts the copies of the HER2 gene in cancer cells.4 HER2 tests provide IHC and ISH scores across the full HER2 spectrum and are routinely used to determine appropriate treatment options for patients with metastatic breast cancer.
Historically, patients with HR-positive metastatic breast cancer and HER2-low diseaseHER2-low disease have had limited effective treatment options following progression on endocrine (hormone) therapy.9 Additionally, few targeted options are available for those with HR-negative disease.10
DESTINY-Breast04
DESTINY-Breast04 is a global, randomised, open-label, Phase III trial evaluating the efficacy and safety of Enhertu (5.4mg/kg) versus physician’s choice of chemotherapy (capecitabine, eribulin, gemcitabine, paclitaxel or nab-paclitaxel) in patients with HR-positive or HR-negative, HER2-low unresectable and/or metastatic breast cancerHER2-low unresectable and/or metastatic breast cancer previously treated with one or two prior lines of chemotherapy. Patients were randomised 2:1 to receive either Enhertu or chemotherapy.
The primary endpoint of DESTINY-Breast04 is PFS in patients with HR-positive disease based on BICR. Key secondary endpoints include PFS based on BICR in all randomised patients (HR-positive and HR-negative disease), OS in patients with HR-positive disease and OS in all randomised patients (HR-positive and HR-negative disease). Other secondary endpoints include PFS based on investigator assessment, objective response rate based on BICR and on investigator assessment, duration of response based on BICR and safety.
DESTINY-Breast04 enrolled 557 patients at multiple sites in Asia, Europe and North America. For more information about the trial, visit ClinicalTrials.gov.
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 a (or one or more) prior anti-HER2-based regimen, either in the metastatic setting or in the neoadjuvant or adjuvant setting, and have developed disease recurrence during or within six months of completing therapy based on the results from the DESTINY-Breast03 trial.
Enhertu (5.4mg/kg) is approved in more than 30 countries for the treatment of adult patients with unresectable or metastaticHER2-low (IHC 1+ or IHC 2+/ ISH-) breast cancer who have received a prior systemic therapy in the metastatic setting or developed disease recurrence during or within six months of completing adjuvant chemotherapy based on the results of the DESTINY-Breast04 trial.
Enhertu (5.4mg/kg) is approved under accelerated approval in the US for the treatment of adult patients with unresectable or metastatic non-small cell lung cancer whose tumours have activating HER2 (ERBB2) mutations, as detected by an FDA-approved test, and who have received a prior systemic therapy based on the results from the DESTINY-Lung02 trial. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial.
Enhertu (6.4mg/kg) is approved in more than 30 countries for the treatment of adult patients with locally advanced or metastatic HER2-positive gastric or gastroesophageal junction adenocarcinomaHER2-positive gastric or gastroesophageal junction adenocarcinoma who have received a prior trastuzumab-based regimen based on the results from the DESTINY-Gastric01 trial and/or DESTINY-Gastric02 trials.
Driven by a growing understanding of breast cancer biology, AstraZeneca is starting to challenge, and redefine, the current clinical paradigm for how breast cancer is classified and treated to deliver even more effective treatments to patients in need – with the bold ambition to one day eliminate breast cancer as a cause of death.
AstraZeneca has a comprehensive portfolio of approved and promising compounds in development that leverage different mechanisms of action to address the biologically diverse breast cancer tumour environment.
AstraZeneca is leading a revolution in oncology with the ambition to provide cures for cancer in every form, following the science to understand cancer and all its complexities to discover, develop and deliver life-changing medicines to patients.
The Company's focus is on some of the most challenging cancers. It is through persistent innovation that AstraZeneca has built one of the most diverse portfolios and pipelines in the industry, with the potential to catalyse changes in the practice of medicine and transform the patient experience.
AstraZeneca has the vision to redefine cancer care and, one day, eliminate cancer as a cause of death.
AstraZeneca (LSE/STO/Nasdaq: AZN) is a global, science-led biopharmaceutical company that focuses on the discovery, development, and commercialisation of prescription medicines in Oncology, Rare Diseases, and BioPharmaceuticals, including Cardiovascular, Renal & Metabolism, and Respiratory & Immunology. Based in Cambridge, UK, AstraZeneca operates in over 100 countries and its innovative medicines are used by millions of patients worldwide. Please visit astrazeneca.com and follow the Company on Twitter @AstraZeneca.
2. Sung H, et al. Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries. CA Cancer J Clin. 2021; 10.3322/caac.21660.
5. Schettini F, et al. Clinical, pathological, and PAM50 gene expression features of HER2-low breast cancer. npj Breast Cancer. 2021; 7:1; https://doi-org.libproxy1.nus.edu.sg/10.1038/s41523-020-00208-2.
6. Schalper K, et al. A retrospective population-based comparison of HER2 immunohistochemistry and fluorescence in situ hybridization in breast carcinomas. Arch Pathol Lab Med. 2014; 138: 213-19.
7. Denkert C, et al. Clinical and molecular characteristics of HER2-low-positive breast cancerHER2-low-positive breast cancer: pooled analysis of individual patient data from four prospective, neoadjuvant clinical trials. 2021. Lancet Oncol; 22: 1151-61.
8. Miglietta F, et al. Evolution of HER2-low expression from primary to recurrent breast cancer. NPJ Breast Cancer. 2021; 7: 137; 10.1038/s41523-021-00343-4.
10. American Cancer Society. Breast Cancer Hormone Receptor Status. Available at: https://www.cancer.org/cancer/breast-cancer/understanding-a-breast-cancer-diagnosis/breast-cancer-hormone-receptor-status.html. Accessed January 2023.