Daiichi Sankyo Highlights Ongoing Progress Across Industry-Leading ADC Portfolio with New Research Updates at ESMO

Daiichi Sankyo (TSE: 4568) will present new clinical research across its oncology portfolio with more than 30 abstracts, including four late breaking presentations, in multiple cancers at the 2026 European Society for Medical Oncology (#ESMO26) Congress.

New data from six landmark trials demonstrate the company’s progress toward advancing new standards of care for patients in breast and lung cancer, including the DESTINY-Breast05 (539RO), DESTINY-Breast06 (4279P), DESTINY-Breast09 (LBA49), DESTINY-Breast11 (543RO) and DESTINY-Lung04 (LBA74) phase 3 trials of Enhertu^® (trastuzumab deruxtecan) and the TROPION-Breast02 (LBA96) phase 3 trial of Datroway^® (datopotamab deruxtecan).

Additional data at ESMO also will spotlight the company’s commitment to advancing research for patients with advanced ovarian cancer across lines of therapy. An updated analysis, including progression-free survival and duration of response, will be presented from the REJOICE-Ovarian01 (1331P) phase 2/3 trial evaluating raludotatug deruxtecan (R-DXd) in patients with platinum-resistant ovarian cancer. A mini oral presentation will highlight preliminary findings from the REJOICE-Ovarian02 (1247RO) phase 1b/2 trial evaluating raludotatug deruxtecan in combination with bevacizumab in patients with platinum-resistant ovarian cancer.

“The promising data for raludotatug deruxtecan in ovarian cancer and the robust scientific innovation demonstrated across our pipeline reflects our progress in advancing research for patients across multiple types of cancer,” said John Tsai, MD, Global Head, R&D, Daiichi Sankyo. “Daiichi Sankyo continues to draw from its scientific and technological expertise to turn science into new medicines that can change the standard of care.”

Data Demonstrate Benefit of DXd ADCs in Patients with Brain Metastases

Research updates highlighting the impact of DXd ADCs in patients with brain metastases include late-breaking rapid oral and proffered paper presentations from the DESTINY-Breast09 (LBA49) phase 3 trial evaluating Enhertu in combination with pertuzumab as a first-line treatment for patients with HER2 positive metastatic breast cancer and the TROPION-Breast02 (LBA96) phase 3 trial evaluating Datroway as a first-line treatment for patients with locally recurrent inoperable or metastatic triple negative breast cancer for whom immunotherapy was not an option. Final overall survival results of the TUXEDO-3 (690O) phase 2 trial of patritumab deruxtecan (HER3-DXd) in patients with active brain metastases from metastatic breast cancer, advanced non-small cell lung cancer (NSCLC) or leptomeningeal disease from any solid tumor will be presented as a proffered paper.

New Data and Trials-in-Progress Presentations Across DXd ADC Portfolio

Additional data highlighting new research across the DXd ADC portfolio include oral and poster presentations, including final results of the TALENT (LBA23) phase 2 trial of Enhertu alone or in combination with anastrozole, or in sequence with chemotherapy, as neoadjuvant treatment for patients with HR positive, HER2 low early stage breast cancer. New data in NSCLC include the NeoCOAST-2 (4244RO) phase 2 trial reporting event-free survival results, as well as findings on the association of ctDNA clearance with clinical outcomes in patients with resectable, early stage NSCLC treated with a combination of Datroway plus durvalumab and chemotherapy, and a retrospective analysis evaluating mechanisms of insensitivity to the Datroway payload in subgroups of patients with advanced NSCLC in the TROPION-Lung01 (4451P) phase 3 trial. Updated findings from the EPOC2003 (2888P) phase 2 trial evaluating neoadjuvant chemotherapy in combination with Enhertu in patients with HER2 positive gastric cancer: results from ESPERANZA (1014P), an external comparator study evaluating Enhertu versus real-world standard of care as a second line or later treatment for patients with HER2 IHC 3+ solid tumors; and, the primary analysis evaluating patritumab deruxtecan monotherapy in patients with melanoma in the HERTHENA-PanTumor01 (2073RO) phase 2 trial also will be presented.

Trials-in-progress poster presentations include the DESTINY-Breast Guide (1795TiP) prospective and interventional trial evaluating first-line treatment with Enhertu plus pertuzumab followed by palbociclib, endocrine therapy and dual HER2 blockade (trastuzumab plus pertuzumab), as well as retreatment with Enhertu following progression on maintenance therapy (palbociclib, endocrine therapy and trastuzumab plus pertuzumab) in previously untreated patients with HER2 positive advanced or metastatic breast cancer and the TROY (1335TiP) phase 2 trial evaluating Enhertu in patients with recurrent ovarian cancer with disease progression on prior PARP inhibitor therapy.

An overview of late-breaking, clinical data and trials-in-progress presentations from the ADC portfolio of Daiichi Sankyo includes:

About the ADC Portfolio of Daiichi Sankyo

The Daiichi Sankyo ADC portfolio consists of nine ADCs in clinical development crafted from ADC technology discovered in-house by Daiichi Sankyo.

The DXd ADC Technology platform of Daiichi Sankyo consists of seven ADCs in clinical development where each ADC is comprised of a monoclonal antibody attached to a number of topoisomerase I inhibitor payloads (an exatecan derivative, DXd) via tetrapeptide-based cleavable linkers. The DXd ADCs include Enhertu and Datroway, which are being jointly developed and commercialized globally with AstraZeneca, and ifinatamab deruxtecan (I-DXd), raludotatug deruxtecan (R-DXd) and patritumab deruxtecan (HER3-DXd), which are being jointly developed and commercialized globally with Merck & Co., Inc, Rahway, NJ, USA. DS-3939 and DS3790 are being developed by Daiichi Sankyo.

Additional ADCs being developed by Daiichi Sankyo include DS3610, which consists of an antibody attached to a novel payload that acts as an agonist of STING, and DS1025, which consists of a CD25 directed antibody attached to an immuno-oncology optimized cytotoxic payload.

Ifinatamab deruxtecan, raludotatug deruxtecan, patritumab deruxtecan, DS-3939, DS3610, DS3790 and DS1025 are investigational medicines that have not been approved for any indication in any country. Safety and efficacy have not been established.

About Daiichi Sankyo

Daiichi Sankyo (TSE: 4568) is a global healthcare company committed to becoming a trusted healthcare innovator, transforming the lives of people through its strength in science and technology. The company discovers and develops new standards of care to address diverse medical needs to fulfill its purpose of contributing to the enrichment of quality of life around the world. With a strategic focus on oncology, Daiichi Sankyo is advancing an industry-leading antibody drug conjugate portfolio along with identifying new breakthrough generating technologies to deliver practice-changing medicines to patients, healthcare professionals and society. For more information, please visit www.daiichisankyo.com.

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