ENHERTU® Approved in Japan for Treatment of Patients with HER2 Positive Unresectable or Metastatic Breast Cancer

Approval based on the pivotal DESTINY-Breast01 trial represents third approval ever under the conditional early approval system in Japan, and follows recent U.S. accelerated approval of ENHERTU®

ENHERTU® represents the second innovative treatment from the oncology pipeline of Daiichi Sankyo   to be approved for use in Japan in past year

TOKYO, Japan, MUNICH, Germany and BASKING RIDGE, NJ, USA I March 25, 2020 I Daiichi Sankyo Company, Limited (hereafter, Daiichi Sankyo) today announced the approval of ENHERTU® (trastuzumab deruxtecan), a HER2 directed antibody drug conjugate (ADC), in Japan for the treatment of patients with HER2 positive unresectable or recurrent breast cancer after prior chemotherapy (limit the use to patients who are refractory or intolerant to standard treatments).

Approval of ENHERTU® by Japan’s Ministry of Health, Labor, and Welfare (MHLW) is based on the results of the open-label, single-arm, pivotal phase 2 DESTINY-Breast01 trial of ENHERTU® (5.4 mg/kg) monotherapy in 184 female patients (including 30 Japanese women) with HER2 positive metastatic breast cancer. A confirmed objective response rate of 64.1% [95% CI: 56.3-71.3] was demonstrated in the response evaluable set of 107 of 167 patients, which was the primary endpoint of the study.[1] Twenty-six women from Japan were included in the objective response rate analysis, with a data cut-off of March 21, 2019.

“Our researchers in Japan have worked diligently on our ADC technology and we are excited to bring ENHERTU®, the first of many ADCs we have in development, to patients with HER2 positive metastatic breast cancer in Japan. Results seen with ENHERTU® are impressive as most women benefited from treatment with durable responses lasting a median duration of more than 14 months,” said Wataru Takasaki, PhD, Corporate Officer, Head of Oncology Function and Head of R&D Division in Japan, Daiichi Sankyo. “ENHERTU® also represents the second innovative treatment to be approved in Japan from our oncology pipeline within the past year, a milestone we are extremely proud of as we work to transform science into meaningful treatments for patients with cancer.”

Efficacy and safety of ENHERTU® in patients without prior trastuzumab, taxane and trastuzumab emtansine treatment have not been established. ENHERTU® is approved in Japan with a Warning for Interstitial Lung Disease (ILD). As cases of ILD, including fatal cases, have occurred in ENHERTU®-treated patients, ENHERTU® is to be used in close collaboration with a respiratory disease expert. Closely observe patients during therapy by monitoring for early signs or symptoms of ILD (such as dyspnea, cough or fever) and regularly perform peripheral artery oxygen saturation (SpO2) tests, chest X-ray scans and chest CT scans. If abnormalities are observed, discontinue administration of ENHERTU®, and take appropriate measures such as corticosteroid administration. Prior to initiation of ENHERTU® therapy, perform a chest CT scan and interview to confirm the absence of any comorbidity or history of ILD with the patient, and carefully consider the eligibility of the patient for ENHERTU® therapy.

Adverse reactions occurred in 182 of 184 patients (98.9%) who received ENHERTU®. The most common adverse reactions were nausea in 140 patients (76.1%), alopecia in 85 patients (46.2%), fatigue in 81 patients (44.0%), vomiting in 78 patients (42.4%), neutrophil count decreased in 55 patients (29.9%), decreased appetite in 52 patients (28.3%), anemia in 40 patients (21.7%) and diarrhea in 40 patients (21.7%). Overall incidence of ILD was 8.2%. ILD occurred in 23% of Japanese patients (7 out of 30) with no grade 3 or above events including no ILD-related deaths.

About HER2 Positive Breast Cancer
Approximately one in five breast cancers are HER2 positive.[2],[3] Despite recent improvements and approvals of new medicines, there remain significant clinical needs for patients with HER2 positive metastatic breast cancer.[4],[5] This disease remains incurable with patients eventually progressing after available treatment.4,5

About HER2
HER2 is a tyrosine kinase receptor growth-promoting protein found on the surface of some cancer cells that is associated with aggressive disease and poor prognosis in patients with breast cancer.[6] To be considered HER2 positive, tumor cancer cells are usually tested by one of two methods: immunohistochemistry (IHC) or fluorescent in situ hybridization (FISH). IHC test results are reported as: 0, IHC 1+, IHC 2+, or IHC 3+.6 A finding of IHC 3+ and/or FISH amplification is considered positive.6

About DESTINY-Breast01
DESTINY-Breast01 is a pivotal phase 2, single-arm, open-label, global, multicenter, two-part trial evaluating the safety and efficacy of ENHERTU® in 184 female patients with HER2 positive unresectable and/or metastatic breast cancer previously treated with ado-trastuzumab emtansine (T-DM1). The primary endpoint of the trial is objective response rate, as determined by independent central review. Secondary objectives include pharmacokinetics, duration of response, disease control rate, clinical benefit rate, progression-free survival, overall survival and safety.

About the Clinical Development Program
A comprehensive development program for ENHERTU® is underway globally with five pivotal trials in HER2 expressing metastatic breast and gastric cancer, including a trial in patients with metastatic breast cancer and low levels of HER2 expression (HER2 low). Phase 2 trials are underway for HER2 expressing advanced colorectal cancer as well as metastatic non-squamous HER2 overexpressing or HER2 mutated non-small cell lung cancer. Trials in combination with other anticancer treatments, such as immunotherapy, also are underway.

ENHERTU® has previously received SAKIGAKE designation for the treatment of advanced HER2 positive gastric or gastroesophageal junction cancer by Japan’s MHLW. 

About ENHERTU®
ENHERTU® (trastuzumab deruxtecan in Japan and other regions of the world; fam-trastuzumab deruxtecan-nxki in the U.S.), is the lead ADC in the oncology portfolio of Daiichi Sankyo and the most advanced program in AstraZeneca’s ADC Scientific platform.

ADCs are targeted cancer medicines that deliver cytotoxic chemotherapy (“payload”) to cancer cells via a linker attached to a monoclonal antibody that binds to a specific target expressed on cancer cells. Designed using Daiichi Sankyo’s proprietary DXd ADC technology, ENHERTU® is comprised of a HER2 monoclonal antibody attached to a topoisomerase I inhibitor payload by a tetrapeptide-based linker.

ENHERTU®, also known as DS-8201, has not been approved in the EU, or countries outside of Japan and the United States, for any indication.

About the Collaboration between Daiichi Sankyo and AstraZeneca
In March 2019, Daiichi Sankyo and AstraZeneca entered into a global collaboration to jointly develop and commercialize ENHERTU®, except in Japan where Daiichi Sankyo maintains exclusive rights. Daiichi Sankyo is solely responsible for the manufacturing and supply.

U.S. FDA-Approved Indication for ENHERTU®
ENHERTU® is a HER2-directed antibody and topoisomerase inhibitor conjugate indicated 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 in the metastatic setting.

This indication is approved under accelerated approval based on tumor response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial.

WARNING: INTERSTITIAL LUNG DISEASE and EMBRYO-FETAL TOXICITY

Interstitial lung disease (ILD) and pneumonitis, including fatal cases, have been reported with ENHERTU®. Monitor for and promptly investigate signs and symptoms including cough, dyspnea, fever, and other new or worsening respiratory symptoms. Permanently discontinue ENHERTU®  in all patients with Grade 2 or higher ILD/pneumonitis. Advise patients of the risk and to immediately report symptoms.

Exposure to ENHERTU® during pregnancy can cause embryo-fetal harm. Advise patients of these risks and the need for effective contraception.

About Daiichi Sankyo
Daiichi Sankyo Group is dedicated to the creation and supply of innovative pharmaceutical therapies to improve standards of care and address diversified, unmet medical needs of people globally by leveraging our world-class science and technology. With more than 100 years of scientific expertise and a presence in more than 20 countries, Daiichi Sankyo and its 15,000 employees around the world draw upon a rich legacy of innovation and a robust pipeline of promising new medicines to help people. In addition to a strong portfolio of medicines for cardiovascular diseases, under the Group’s 2025 Vision to become a “Global Pharma Innovator with Competitive Advantage in Oncology.” Daiichi Sankyo is primarily focused on providing novel therapies in oncology, as well as other research areas centered around rare diseases and immune disorders. For more information, please visit: www.daiichisankyo.com.

References:

[1] ENHERTU® for intravenous drip infusion 100 mg. Japan Prescribing Information.

[2] Tandon A, et al. J Clin Oncol. 1989;7(8):1120-8.

[3] Sledge G, et al. J Clin Oncol. 2014;32(19):1979-1986.

[4] de Melo Gagliato D, et al. Oncotarget. 2016;7(39):64431-46.

[5] National Comprehensive Cancer Network (NCCN). NCCN Guidelines. Breast Cancer. Accessed August 2019.

[6]  American Cancer Society. Breast Cancer HER2 Status. Accessed August 2019.

SOURCE: Daiichi Sankyo

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