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Overall survival was twice as long for people treated with Columvi in combination with GemOx versus MabThera/Rituxan plus GemOx1This Columvi combination is available off-the-shelf and could offer a potentially curative treatment option for people with R/R DLBCL who are not candidates for transplantColumvi in combination with GemOx has now been approved in more than 50 countries worldwide and recommended in international treatment guidelines2-4 Basel, 8 December 2025 - Roche (SIX: RO, ROG; OTCQX: RHHBY) announced today three-year follow-up data from the pivotal phase III STARGLO study in people with relapsed or refractory (R/R) diffuse large B-cell lymphoma (DLBCL) who have received at least one prior line of therapy and are not candidates for autologous stem cell transplant (ASCT). After a median follow-up of 35.1 months, overall survival (OS) remained twice as long for people treated with Columvi® (glofitamab) in combination with gemcitabine and oxaliplatin (GemOx) versus MabThera®/Rituxan® (rituximab) plus GemOx (R-GemOx) (25.5 months versus 12.5 months, respectively [hazard ratio (HR)=0.60, 95% confidence interval (CI): 0.43-0.8]).1 Results were presented at the 67th American Society of Hematology Annual Meeting and Exposition, 6-9 December 2025 in Orlando, Florida, US. Subgroup analyses showed consistent results across clinically relevant subgroups of prior line of therapy and age.1 The greatest efficacy benefit was seen in people who had received one prior line of therapy (second line, 2L), with 54.6% still alive at 36 months follow-up.1 For these patients, median OS was not reached with Columvi in combination with GemOx versus 14.4 months (HR=0.58; 95% CI: 0.38-0.89) in the R-GemOx arm.1 Median progression-free survival (PFS) was 20.4 versus 5.5 months (HR=0.41; 95% CI: 0.25-0.65).1 In patients with 2L DLBCL with early relapse (within 12 months), who are typically harder to treat, the complete response rate was 56.0% and the 36 month OS rate was 46.1%.5 “At three years, we see flattening of the overall survival curve, suggesting the possibility of cure for relapsed/refractory DLBCL patients treated with glofitamab-GemOx,” said Jeremy Abramson, MD, Director, Jon and Jo Ann Hagler Center for Lymphoma at the Mass General Brigham Cancer Institute, US, and principal investigator of the STARGLO study. “These data continue to underscore the meaningful benefit of Glofitamab plus GemOx for patients after initial relapse, when fast and effective treatment is critical given the aggressive nature of this disease.” “By prolonging survival, this Columvi combination could offer people with relapsed or refractory DLBCL long-term remission, and potential additional time to spend with their loved ones without signs of disease or the need for continuous therapy,” said Levi Garraway, MD, PhD, Roche’s Chief Medical Officer and Head of Global Product Development. “The potential of Columvi in combination with GemOx continues to be recognised globally, with approvals in more than 50 countries around the world and inclusion in multiple international treatment guidelines.” Data add to the growing body of evidence supporting the value that this Columvi-based combination can bring to people with 2L+ DLBCL who are not candidates for ASCT or who face barriers accessing other treatment options. As an off-the-shelf and fixed-duration therapy, Columvi plus GemOx can be readily available for infusion in any setting, meaning patients could avoid crucial delays in starting treatment and allowing the possibility of a treatment-free period. The safety profile was unchanged with extended follow up; no new signals were identified, and safety of the combination was consistent with the known safety profiles of the individual medicines. Cytokine release syndrome (CRS) remained the most common adverse event in people treated with Columvi plus GemOx (44.8%; Grade 1: 32.0%, Grade 2: 10.5%, Grade 3: 2.3%).1 Immune recovery in the form of median B-cell and immunoglobulin M count was observed 18-24 months after end-of-treatment.1 Based on the STARGLO data, this Columvi combination is approved in more than 50 countries worldwide, including countries in the EU, the UK, Canada, Australia, China and Mexico, with additional submissions to health authorities ongoing*. Columvi in combination with GemOx is recommended in clinical practice guidelines including the European Society For Medical Oncology, European Hematology Association and the US National Comprehensive Cancer Network Clinical Practice Guidelines in Oncology (NCCN Guidelines®) with category 1 evidence for people with 2L+ DLBCL.†2-4 The US Food and Drug Administration issued a Complete Response Letter for the supplemental Biologics License Application for Columvi in combination with GemOx for this indication. Roche is continuing to explore the potential of Columvi across other settings including first-line (1L) DLBCL and mantle cell lymphoma (MCL) to elevate treatment standards even further. This includes the phase III SKYGLO study investigating Columvi in combination with Polivy® (polatuzumab vedotin), MabThera/Rituxan, cyclophosphamide, doxorubicin and prednisone, in 1L DLBCL, which has recently completed enrolment. In R/R MCL, the phase III GLOBRYTE study evaluating Columvi as a single agent versus investigator’s choice of therapy is currently recruiting. About the STARGLO studyThe STARGLO study [GO41944; NCT04408638] is a phase III, multicentre, open-label, randomised study evaluating the efficacy and safety of Columvi® (glofitamab) in combination with gemcitabine plus oxaliplatin (GemOx) versus MabThera®/Rituxan® (rituximab) in combination with GemOx in patients with relapsed or refractory diffuse large B-cell lymphoma who have received at least one prior line of therapy and who are not candidates for autologous stem cell transplant, or who have received two or more prior lines of therapy. Preclinical research indicated an increased antitumour effect when combining Columvi with GemOx over GemOx alone, so the STARGLO study was initiated to further explore the potential complementary effects of the treatment combination. Outcome measures include overall survival (primary endpoint), progression-free survival, complete response rate, objective response rate, duration of objective response (secondary endpoints), and safety and tolerability. About Columvi® (glofitamab)Columvi is a CD20xCD3 T-cell-engaging bispecific antibody designed to target CD3 on the surface of T cells and CD20 on the surface of B cells. Columvi was designed with a novel 2:1 structural format. This T-cell-engaging bispecific antibody is engineered to have one region that binds to CD3, a protein on T cells, a type of immune cell, and two regions that bind to CD20, a protein on B cells, which can be healthy or malignant. This dual-targeting brings the T cell in close proximity to the B cell, activating the release of cancer cell-killing proteins from the T cell. Columvi is part of Roche’s broad and industry-leading CD20xCD3 T-cell-engaging bispecific antibody clinical development programme that also includes Lunsumio® (mosunetuzumab), which aims to provide tailored treatment options that suit the diverse needs, preferences, and experiences of people with blood cancers and healthcare systems. Roche is investigating Columvi as a monotherapy and in combination with other medicines for the treatment of diffuse large B-cell lymphoma and mantle cell lymphoma. About diffuse large B-cell lymphoma (DLBCL)DLBCL is an aggressive (fast-growing) type of non-Hodgkin lymphoma (NHL) and the most common form, accounting for about one in three cases of NHL.6 Approximately 160,000 people worldwide are diagnosed with DLBCL each year, with comparable incidence rates across regions.7,8 Medical practices, including pathological classification, diagnosis, staging, initial treatment and relapse management, are similarly approached worldwide.8-11 While it is generally responsive to treatment in the frontline, as many as 40% of people will relapse or have refractory disease, at which time salvage therapy options are limited and survival is short.12,13 Improving treatments earlier in the course of the disease and providing much needed alternative options could help to improve long-term outcomes. About Roche in haematologyRoche has been developing medicines for people with malignant and non-malignant blood diseases for more than 25 years; our experience and knowledge in this therapeutic area runs deep. Today, we are investing more than ever in our effort to bring innovative treatment options to patients across a wide range of haematologic diseases. Our approved medicines include MabThera®/Rituxan® (rituximab), Gazyva®/Gazyvaro® (obinutuzumab), Polivy® (polatuzumab vedotin), Venclexta®/Venclyxto® (venetoclax) in collaboration with AbbVie, Hemlibra® (emicizumab), PiaSky® (crovalimab), Lunsumio® (mosunetuzumab) and Columvi® (glofitamab). Our pipeline of investigational haematology medicines includes T-cell-engaging bispecific antibody cevostamab, targeting both FcRH5 and CD3, and Tecentriq® (atezolizumab). Our scientific expertise, combined with the breadth of our portfolio and pipeline, also provides a unique opportunity to develop combination regimens that aim to improve the lives of patients even further.About Roche Founded in 1896 in Basel, Switzerland, as one of the first industrial manufacturers of branded medicines, Roche has grown into the world’s largest biotechnology company and the global leader in in-vitro diagnostics. The company pursues scientific excellence to discover and develop medicines and diagnostics for improving and saving the lives of people around the world. We are a pioneer in personalised healthcare and want to further transform how healthcare is delivered to have an even greater impact. To provide the best care for each person, we partner with many stakeholders and combine our strengths in Diagnostics and Pharma with data insights from clinical practice. For over 125 years, sustainability has been an integral part of Roche’s business. As a science-driven company, our greatest contribution to society is developing innovative medicines and diagnostics that help people live healthier lives. Roche is committed to the Science Based Targets initiative and the Sustainable Markets Initiative to achieve net zero by 2045. Genentech, in the United States, is a wholly owned member of the Roche Group. Roche is the majority shareholder in Chugai Pharmaceutical, Japan. For more information, please visit www.roche.com. All trademarks used or mentioned in this release are protected by law. *Countries that have approved Columvi in combination with GemOx in R/R DLBCL include: Argentina, Australia, Bahrain, Bosnia and Herzegovina, Canada, China, the European Union, Iceland, Lebanon, Liechtenstein, Macedonia, Malaysia, Mexico, New Zealand, Norway, Oman, Paraguay, Peru, Qatar, South Korea, Taiwan, Thailand, United Arab Emirates, United Kingdom, Uruguay. †NCCN makes no warranties of any kind whatsoever regarding their content, use or application and disclaims any responsibility for their application or use in any way. References[1] Abramson JS, et al. Sustained clinical benefit of glofitamab plus gemcitabine and oxaliplatin (GemOx) versus rituximab plus GemOx (R-GemOx) in patients with relapsed/refractory (R/R) diffuse large B-cell lymphoma (DLBCL): 3-year follow-up of STARGLO. Presented at: ASH Annual Meeting; 2025 Dec 6-9; Orlando, FL, USA. Abstract #5519.[2] Eyre TA, at al. Lymphomas: ESMO Clinical Practice Guideline for diagnosis, treatment and follow-up. Ann Oncol. 2025;36(11):1263-1284.[3] Thieblemont C, et al. Large B-cell lymphoma (LBCL): EHA Clinical Practice Guidelines for diagnosis, treatment, and follow-up. HemaSphere. 2025;9:e70207.[4] NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines®) for B-Cell Lymphomas V.1.2025.[5] Abdulhaq H, et al. Glofitamab plus gemcitabine and oxaliplatin (GemOx) vs rituximab (R)-GemOx in patients with relapsed/refractory (R/R) diffuse large B-cell lymphoma (DLBCL): Efficacy and safety in patient subgroups. Presented at: ASH Annual Meeting; 2025 Dec 6-9; Orlando, FL, USA. Abstract #3743.[6] UpToDate. Patient education: Diffuse large B cell lymphoma in adults (Beyond the Basics). [Internet; cited December 2025]. Available from: https://www.uptodate.com/contents/diffuse-large-b-cell-lymphoma-in-adults-beyond-the-basics.[7] World Health Organization. Numbers derived from GLOBOCAN 2022. Non-Hodgkin Lymphoma Factsheet [Internet; cited December 2025]. Available from: https://gco.iarc.who.int/media/globocan/factsheets/cancers/34-non-hodgkin-lymphoma-fact-sheet.pdf.[8] Budde LE, et al. Characterizing the US Patient Population Receiving Rituximab with Gemcitabine and Oxaliplatin (R-GemOx) for Relapsed or Refractory Diffuse Large B-Cell Lymphoma Using Real-World Data. Blood. 2024;144(1):2373.[9] Yamshon, et al. Outcomes of Relapsed or Refractory Diffuse Large B-Cell Lymphoma Treated With R-GemOx: A Multicenter Cohort Study. Hematol. 2025;100(4):606-615.[10] Sineshaw HM, Zettler CM, Prescott J, et al. Real-world patient characteristics, treatment patterns, and treatment outcomes of patients with diffuse large B-cell lymphoma by line of therapy. Cancer Med. 2024 Apr;13(7):e7173.[11] Koff JL, Larson MC, Martin P et al. LEO Consortium for Real World Evidence (CReWE): Outcomes after Second-Line Therapy in Large B-Cell Lymphoma by Treatment Era. Blood (2023) 142 (Supplement 1): 307.[12] Fabbri N, et al. Second-line treatment of diffuse large B-cell lymphoma: Evolution of options. Semin Hematol 2023; 60(5): 305–312.[13] Sehn LH, et al. Diffuse Large B-Cell Lymphoma. N Engl J Med. 2021;384(9):842-858. Roche Global Media RelationsPhone: +41 61 688 8888 / e-mail: media.relations@roche.com Hans Trees, PhDPhone: +41 79 407 72 58Sileia UrechPhone: +41 79 935 81 48 Nathalie AltermattPhone: +41 79 771 05 25Lorena CorfasPhone: +41 79 568 24 95 Simon GoldsboroughPhone: +44 797 32 72 915Karsten KleinePhone: +41 79 461 86 83 Kirti PandeyPhone: +49 172 6367262 Yvette PetillonPhone: +41 79 961 92 50Dr Rebekka SchnellPhone: +41 79 205 27 03 Roche Investor Relations Dr. Bruno EschliPhone: +41 61 68-75284e-mail: bruno.eschli@roche.comDr Sabine BorngräberPhone: +41 61 68-88027e-mail: sabine.borngraeber@roche.com Dr. Birgit MasjostPhone: +41 61 68-84814e-mail: birgit.masjost@roche.com Investor Relations North America Loren KalmPhone: +1 650 225 3217e-mail: kalm.loren@gene.com Attachment Media Investor Release Columvi STARGLO ASH English

Additional data from DESTINY-Breast11, DESTINY-Breast05, DESTINY-Breast09, DESTINY-Breast03 and TROPION-Breast02 reinforce practice-changing results of ENHERTU ® and DATROWAY ® across a broad spectrum of patients with breast cancer Trials-in-progress across breast cancer portfolio of Daiichi Sankyo demonstrate company’s commitment to creating new standards of care Science & Technology Day to be held following SABCS to discuss R&D and oncology business updates TOKYO & BASKING RIDGE, N.J.--(BUSINESS WIRE)--Daiichi Sankyo (TSE: 4568) will present new breast cancer clinical research across its DXd antibody drug conjugate (ADC) portfolio from more than 30 abstracts at the 2025 San Antonio Breast Cancer Symposium (#SABCS25), which include four rapid fire mini-oral sessions and other presentations from five landmark trials of ENHERTU® (trastuzumab deruxtecan) and DATROWAY® (datopotamab deruxtecan) across a broad spectrum of breast cancer. Four rapid fire mini-oral sessions will feature ENHERTU data in the curative-intent and metastatic settings of HER2 positive breast cancer, including two presentations from the DESTINY-Breast11 phase 3 trial highlighting patient reported outcomes (RF6-06) and further safety analyses (RF6-02) of ENHERTU followed by paclitaxel, trastuzumab and pertuzumab (THP) compared to dose-dense doxorubicin and cyclophosphamide followed by THP (ddAC-THP) in the neoadjuvant setting (before surgery) in patients with high-risk, locally advanced HER2 positive early-stage breast cancer. Additional efficacy and safety data (RF6-01) from the DESTINY-Breast05 phase 3 trial comparing ENHERTU to trastuzumab emtansine (T-DM1) as a post-neoadjuvant (after surgery) therapy in patients with high-risk HER2 positive early breast cancer with residual invasive disease in the breast and/or axillary lymph nodes also will be highlighted. The fourth rapid fire presentation will feature patient reported outcomes (RF6-07) from the ENHERTU plus pertuzumab arm of the DESTINY-Breast09 phase 3 trial as a first-line treatment of HER2 positive metastatic breast cancer. Interim results from DESTINY-Breast09 were recently published in The New England Journal of Medicine, marking the eighth pivotal trial of ENHERTU to be published in the prestigious journal. Additional updates from two other landmark breast cancer trials include poster presentations featuring the final analysis and five-year follow-up of efficacy and safety data (PS5-01-30) from the DESTINY-Breast03 phase 3 trial comparing ENHERTU versus T-DM1 as a second-line treatment of HER2 positive metastatic breast cancer, and further safety analysis (PS5-03-05) from the TROPION-Breast02 phase 3 trial of DATROWAY, the first trial ever to demonstrate a significant improvement in overall survival compared to chemotherapy as first-line treatment for patients with locally recurrent inoperable or metastatic triple negative breast cancer (TNBC) for whom immunotherapy is not an option. “Our latest research across these five landmark trials demonstrate how the DXd antibody drug conjugate portfolio of Daiichi Sankyo continues to potentially transform standards of care for patients with breast cancer,” said Ken Takeshita, MD, Global Head, R&D, Daiichi Sankyo. “We remain committed to following the science and collaborating with the breast cancer community to create innovative medicines that advance the treatment of breast cancer.” Additional data from the DESTINY clinical trial program to be highlighted in poster presentations at SABCS include an exploratory post-hoc subgroup analysis by hormone receptor status from the DESTINY-Breast12 phase 3b/4 trial (PS5-01-27) of ENHERTU in patients with HER2 positive metastatic breast cancer and brain metastases; the final results from the ENHERTU monotherapy and ENHERTU plus pertuzumab arms of the DESTINY-Breast07 phase 1b/2 trial (PS5-01-14) in patients with previously untreated HER2 positive metastatic breast cancer; and, initial characteristics of first enrolled patients from the DESTINY Breast Respond HER2 Low Europe non-interventional study (PS5-08-14) of ENHERTU in HER2 low metastatic breast cancer. Collaborations Supporting Innovation in Breast Cancer Research Additional data presented at SABCS include results from four externally sponsored trials across the DXd ADC pipeline of Daiichi Sankyo. Two spotlight poster presentations will report interim results from the HALLOW prospective observational trial (PD13-11) evaluating the efficacy and safety of ENHERTU in patients with HER2 low (IHC 1+ or 2+/ISH-) metastatic breast cancer with and without active brain metastases in Japan, and a post-hoc pooled efficacy analysis (PD13-10) from the TUXEDO-3 phase 2 trial of patritumab deruxtecan (HER3-DXd) in patients with HER2 positive metastatic breast cancer and active brain metastases or leptomeningeal disease previously treated with ENHERTU. Results from cohorts 1 and cohorts 2 of the TUXEDO-3 trial were recently published in The Lancet Oncology and results from cohort 3 were published in Nature Medicine. Two poster presentations will report on the intracranial and/or extracranial activity of ENHERTU and DATROWAY. A translational ctDNA analysis of intracranial and extracranial activity (PS2-08-20) of ENHERTU from the DEBBRAH phase 2 trial in patients with HER2 positive and HER2 low breast cancer with leptomeningeal disease will be highlighted, as well as results of intracranial activity (PS1-09-02) of DATROWAY from the DATO-BASE phase 2 trial in patients with HER2 negative breast cancer with leptomeningeal disease. Trials-in-Progress Across Breast Cancer Portfolio of Daiichi Sankyo Several trials-in-progress poster presentations at SABCS further highlight research underway to address a broad spectrum of unmet needs for patients with breast cancer. Additional externally sponsored trials for ENHERTU and DATROWAY include the PONTIAC phase 2 trial (PS5-07-15) evaluating ENHERTU versus CDK4/6 inhibitor-based endocrine therapy as a first-line treatment of non-luminal HR positive, HER2 low and HER2 ultralow advanced breast cancer; a phase 1b trial (PS5-09-22) evaluating ENHERTU in combination with valemetostat, an EZH1/2 inhibitor, in patients with HER2 low, HER2 ultralow and HER2 null metastatic breast cancer; and the TROPION-Breast06 phase 3b trial (PS5-07-21) of DATROWAY in patients with HR positive, HER2 IHC 0 inoperable or metastatic breast cancer refractory to endocrine therapy. Three additional trials-in-progress from the HERTHENA clinical development program of patritumab deruxtecan (HER3-DXd) also will be highlighted. These include the HERTHENA-Breast04 phase 3 trial (PS5-07-22) evaluating patritumab deruxtecan versus physician’s choice of treatment in patients with HR positive, HER2 negative unresectable locally advanced or metastatic breast cancer; the HERTHENA-Breast03 phase 2 trial (PS5-12-21) evaluating neoadjuvant patritumab deruxtecan plus pembrolizumab before or after pembrolizumab plus chemotherapy in patients with high-risk early-stage TNBC or HR low positive/HER2 negative breast cancer; and, the HERTHENA-Breast01 phase 1b/2 trial (PS5-12-23) evaluating patritumab deruxtecan in combination with HER2 targeted agents in patients with HER2 positive unresectable locally advanced or metastatic breast cancer. Science & Technology Day Daiichi Sankyo will hold its annual Science & Technology Day for investors on Monday, December 15, 2025, from 5:30 to 7:30 pm ET / Tuesday, December 16, 2025, from 7:30 – 9:30 am JST. Executives from Daiichi Sankyo will provide an update on R&D, business and manufacturing developments across the portfolio. Daiichi Sankyo Presentation Highlights at SABCS Presentation Title Author Abstract Presentation (CST) ENHERTU (trastuzumab deruxtecan; T-DXd) Patient-reported outcomes in DESTINY-Breast11: neoadjuvant treatment with trastuzumab deruxtecan (T-DXd) alone or followed by paclitaxel + trastuzumab + pertuzumab (THP) vs dose-dense doxorubicin + cyclophosphamide followed by THP (ddAC-THP) in high-risk, HER2+ early-stage breast cancer S. Modi RF6-06 Rapid Fire 6 Mini-Oral Session Wednesday, December 10 1:00 – 2:00 pm DESTINY-Breast11 safety: neoadjuvant trastuzumab deruxtecan (T-DXd) alone or followed by paclitaxel + trastuzumab + pertuzumab (THP) vs dose-dense doxorubicin + cyclophosphamide followed by THP (ddAC-THP) in high-risk, HER2+ early-stage breast cancer G. Curigliano RF6-02 Rapid Fire 6 Mini-Oral Session Wednesday, December 10 1:00 – 2:00 pm Additional efficacy and safety from the DESTINY-Breast05 study of trastuzumab deruxtecan (T-DXd) vs trastuzumab emtansine (T‑DM1) in patients with high-risk human epidermal growth factor receptor 2–positive (HER2+) primary early breast cancer with residual invasive disease after neoadjuvant therapy S. Loibl RF6-01 Rapid Fire 6 Mini-Oral Session Wednesday, December 10 1:00 – 2:00 pm Trastuzumab deruxtecan (T-DXd) + pertuzumab vs taxane + trastuzumab + pertuzumab (THP) for first-line treatment of patients with HER2 positive (HER2+) advanced/metastatic breast cancer: patient-reported outcomes from the DESTINY-Breast09 study M. Rimawi RF6-07 Rapid Fire 6 Mini-Oral Session Wednesday, December 10 1:00 – 2:00 pm Trastuzumab deruxtecan (T-DXd) versus trastuzumab emtansine (T-DM1) in patients with human epidermal growth factor receptor 2-positive (HER2+) metastatic breast cancer: final analysis from DESTINY-Breast03 S. Im PS5-01-30 Poster Session 5 Friday, December 12 12:30 – 2:00 pm Trastuzumab deruxtecan (T-DXd) monotherapy and T-DXd + pertuzumab in patients with previously untreated HER2+ unresectable/metastatic breast cancer: final results from DESTINY-Breast07 F. Andre PS5-01-14 Poster Session 5 Friday, December 12 12:30 – 2:00 pm Outcomes by hormone receptor status in patients with HER2+ advanced/metastatic breast cancer with brain metastases treated with trastuzumab deruxtecan (T-DXd): a post-hoc subgroup analysis of DESTINY-Breast12 H. Wildiers PS5-01-27 Poster Session 5 Friday, December 12 12:30 – 2:00 pm DESTINY-Breast Respond HER2 low Europe: description of first enrolled patients in the non-interventional study of T-DXd in HER2 low metastatic breast cancer V. Guarneri PS5-08-14 Poster Session 5 Friday, December 12 12:30 – 2:00 pm Interim analysis results for the effectiveness and safety of trastuzumab deruxtecan in patients with HER2 low breast cancer and brain metastases: the HALLOW study N. Niikura PD13-11 Poster Spotlight 13 Friday, December 12 7:00 – 8:30 am Translational analysis of cerebrospinal fluid and plasma circulating tumor DNA from breast cancer patients with leptomeningeal disease treated with trastuzumab deruxtecan (T-DXd) in the DEBBRAH trial A. Fitzpatrick PS2-08-20 Poster Session 2 Wednesday, December 10 5:00 – 6:30 pm Trials-in-Progress A randomized phase 2 study to evaluate the efficacy and safety of trastuzumab deruxtecan (T-DXd) versus CDK4/6 inhibitor-based endocrine therapy as first-line therapy of hormone receptor-positive and HER2 low/ultralow advanced breast cancer patients classified as non-luminal subtype according to gene expression profiling: the PONTIAC study J. Cortes PS5-07-15 Poster Session 5 Friday, December 12 12:30 – 2:00 pm Phase 1b study of EZH1/2 inhibitor valemetostat in combination with trastuzumab deruxtecan in subjects with HER2 low/ultralow/null metastatic breast cancer S. Damodaran PS5-09-22 Poster Session 5 Friday, December 12 12:30 – 2:00 pm DATROWAY (datopotamab deruxtecan; Dato-DXd) First-line datopotamab deruxtecan (Dato-DXd) vs chemotherapy in patients with locally recurrent inoperable or metastatic triple negative breast cancer (TNBC) for whom immunotherapy was not an option: additional safety analyses from the TROPION-Breast02 study T. Traina PS5-03-05 Poster Session 5 Friday, December 12 12:30 – 2:00 pm Intracranial activity of datopotamab deruxtecan (Dato-DXd) for patients with HER2 negative breast cancer and leptomeningeal disease: results from cohort C of the DATO-Base phase 2 trial P. Tarantino PS1-09-02 Poster Session 1 Wednesday, December 10 12:30 – 2:00 pm Trials-in-Progress TROPION-Breast06: multicenter, multinational, open-label, single-arm, phase 3b study of datopotamab deruxtecan (Dato-DXd) in patients with locally advanced inoperable or metastatic HR+/HER2 IHC 0 breast cancer refractory to endocrine therapy K. Jhaveri PS5-07-21 Poster Session 5 Friday, December 12 12:30 – 2:30 pm Patritumab Deruxtecan (HER3-DXd) Outcome of patritumab deruxtecan (HER3-DXd) in patients with HER2 positive metastatic breast cancer and CNS involvement previously treated with T-DXd: a subanalysis of TUXEDO-3 R. Bartsch PD13-10 Poster Spotlight 13 Friday, December 12 7:00 – 8:30 am Trials-in-Progress HERTHENA-Breast04: a phase 3, randomized, open-label study evaluating the efficacy and safety of patritumab deruxtecan (HER3-DXd) versus treatment of physician’s choice in hormone receptor positive (HR+)/human epidermal growth factor receptor 2 negative (HER2-) unresectable locally advanced or metastatic breast cancer B. Pistilli PS5-07-22 Poster Session 5 Friday, December 12 12:30 – 2:00 pm HERTHENA-Breast03: a phase 2, randomized, open-label study evaluating neoadjuvant patritumab deruxtecan (HER3-DXd) + pembrolizumab before or after pembrolizumab + chemotherapy for early-stage TNBC or HR-low+/HER2− breast cancer J. O’Shaughnessy PS5-12-21 Poster Session 5 Friday, December 12 12:30 – 2:00 pm HERTHENA-Breast01: a phase 1b/2, multicenter, open-label, dose-finding study to evaluate the safety and antitumor activity of patritumab deruxtecan (HER3-DXd) in HER2+ unresectable locally advanced or metastatic breast cancer S. Tolaney PS5-12-23 Poster Session 5 Friday, December 12 12:30 – 2:00 pm About the ADC Portfolio of Daiichi Sankyo The Daiichi Sankyo ADC portfolio consists of eight ADCs in clinical development crafted from ADC technology discovered in-house by Daiichi Sankyo. The DXd ADC Technology platform of Daiichi Sankyo consists of six 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 is being developed by Daiichi Sankyo. Additional ADCs being developed by Daiichi Sankyo include DS-9606, which consists of a monoclonal antibody attached to a modified pyrrolobenzodiazepine (PBD) payload and DS3610, which consists of an antibody attached to a novel immunomodulatory payload that acts as an agonist of STING. Ifinatamab deruxtecan, raludotatug deruxtecan, patritumab deruxtecan, DS-3939, DS-9606 and DS3610 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 is an innovative global healthcare company contributing to the sustainable development of society that discovers, develops and delivers new standards of care to enrich the quality of life around the world. With more than 120 years of experience, Daiichi Sankyo leverages its world-class science and technology to create new modalities and innovative medicines for people with cancer, cardiovascular and other diseases with high unmet medical needs. For more information, please visit www.daiichisankyo.com.