XPO1

BPDCN is an aggressive hematologic malignancy with a historically poor prognosisVisualDx is a clinical decision support system used by more than 2,300 hospitals, clinics, and medical schools around the world VisualDx’s system seeks to enhance identification of people who may have BPDCN, leveraging actual images of BPDCN skin lesions and artificial intelligence/machine learning (AI/ML) technologies incorporated into the VisualDx platform FLORENCE, Italy and NEW YORK, March 20, 2025 (GLOBE NEWSWIRE) -- The Menarini Group ("Menarini"), a leading international pharmaceutical and diagnostics company, and Stemline Therapeutics, Inc. ("Stemline"), a wholly-owned subsidiary of the Menarini Group focused on bringing transformational oncology treatments to cancer patients, today announced that they are collaborating with VisualDx to enhance identification of people who may have BPDCN. This is an example of innovative companies working together to bring artificial intelligence/machine learning (AI/ML) tools to help identify BPDCN as a possible early differential diagnosis. The project includes leveraging actual images of BPDCN skin lesions and AI/ML technologies incorporated into the VisualDx platform. The AI model is now live within VisualDx. VisualDx is a physician-led company committed to improving medical decision-making, medical education and research. The VisualDx tool is a clinical decision support system used by more than 2,300 hospitals, clinics, and medical schools around the world. The software includes a comprehensive database of clinical images, submitted through partnerships with learning institutions and others, and vetted by clinicians, to assist healthcare professionals to identify skin concerns across all skin types. Through the AI image search, clinicians can better understand different skin conditions with the goal of supporting patients to get more accurate diagnoses throughout their care journeys. BPDCN is an aggressive orphan hematologic malignancy with a historically poor prognosis (approximately 8.7 to 14 months post diagnosis1) that typically presents skin lesions and can also involve the bone marrow, blood, central nervous system, lymph nodes and viscera. Dermatologists may be the first to recognize the signs of BPDCN and biopsy suspicious lesions. Pathologists can then test for BPDCN by testing for certain biomarkers which are highly expressed on BPDCN cells. Tagraxofusp-erzs is the only approved treatment for patients with BPDCN, and the first and only approved CD123-targeted therapy, in the United States, Europe and other global regions. "BPDCN is a rare and clinically aggressive hematologic malignancy, often presenting with cutaneous lesions. Due to its aggressive nature and the immature cell involvement, the prognosis can be poor if not treated promptly,” said Marina Konopleva, MD, Phd, Professor, Molecular Pharmacology, Director, Leukemia Program and Co-Director, Blood Cancer Institute, at Montefiore Einstein. “Early diagnosis plays a critical role in improving patient outcomes, and emerging AI/ML technologies may offer valuable support in the differential diagnosis and early identification of BPDCN." “BPDCN often first presents as a skin lesion and usually has a poor prognosis. There is a dire need for early diagnosis so that patients may access appropriate treatment options,” said Elcin Barker Ergun, CEO of the Menarini Group. “We are delighted to collaborate with VisualDx to provide healthcare teams with a tool using the latest artificial intelligence/machine learning (AI/ML) technology to help interpret challenging skin lesions.” VisualDx does not store any images uploaded by clinicians taking a picture of their patients’ skin exams. This helps maintain the patient’s privacy. About BPDCNBPDCN, formerly blastic NK-cell lymphoma, is an aggressive, orphan hematologic malignancy, often with cutaneous manifestations, with historically poor outcomes. BPDCN typically presents skin lesions and may also involve bone marrow, blood, central nervous system, lymph nodes and viscera. The BPDCN cell of origin is the plasmacytoid dendritic cell (pDC) precursor. The diagnosis of BPDCN is based on the immunophenotypic diagnostic triad of CD123, CD4, and CD56, as well as other markers. The World Health Organization (WHO) termed this disease “BPDCN” in 2008; previous names included blastic NK cell lymphoma and CD4+/CD56+ hematodermic neoplasm. About ELZONRIS® (Tagraxofusp-erzs)U.S. Indication: ELZONRIS is a prescription medicine used to treat blastic plasmacytoid dendritic cell neoplasm (BPDCN) in adults and pediatric patients 2 years and older. Full prescribing information for the U.S. can be found at www.elzonris.com IMPORTANT SAFETY INFORMATION, ELZONRIS®Boxed WARNING: CAPILLARY LEAK SYNDROME Capillary Leak Syndrome (CLS) which may be life-threatening or fatal, can occur in patients receiving ELZONRIS. Monitor for signs and symptoms of CLS and take actions as recommended. Warnings and Precautions Capillary Leak Syndrome Capillary leak syndrome (CLS), including life-threatening and fatal cases, has been reported among patients treated with ELZONRIS. In patients receiving ELZONRIS in clinical trials, the overall incidence of CLS was 53% (65/122), including Grade 1 or 2 in 43% (52/122) of patients, Grade 3 in 7% (8/122) of patients, Grade 4 in 1% (1/122) of patients, and four fatalities (3%). The median time to onset was 4 days (range - 1 to 46 days), and all but 5 patients experienced an event in Cycle 1. Before initiating therapy with ELZONRIS, ensure that the patient has adequate cardiac function and serum albumin is greater than or equal to 3.2 g/dL. During treatment with ELZONRIS, monitor serum albumin levels prior to the initiation of each dose of ELZONRIS and as indicated clinically thereafter, and assess patients for other signs or symptoms of CLS, including weight gain, new onset or worsening edema, including pulmonary edema, hypotension or hemodynamic instability. Hypersensitivity Reactions ELZONRIS can cause severe hypersensitivity reactions. In patients receiving ELZONRIS in clinical trials, hypersensitivity reactions were reported in 43% (53/122) of patients treated with ELZONRIS and were Grade ≥ 3 in 7% (9/122). Manifestations of hypersensitivity reported in ≥ 5% of patients include rash, pruritus, and stomatitis. Monitor patients for hypersensitivity reactions during treatment with ELZONRIS. Interrupt ELZONRIS infusion and provide supportive care as needed if a hypersensitivity reaction should occur. Hepatotoxicity Treatment with ELZONRIS was associated with elevations in liver enzymes. In patients receiving ELZONRIS in clinical trials, elevations in ALT occurred in 79% (96/122) and elevations in AST occurred in 76% (93/122). Grade 3 ALT elevations were reported in 26% (32/122) of patients. Grade 3 AST elevations were reported in 30% (36/122) and Grade 4 AST elevations were reported in 3% (4/122) of patients. Elevated liver enzymes occurred in the majority of patients in Cycle 1 and were reversible following dose interruption. Monitor alanine aminotransferase (ALT) and aspartate aminotransferase (AST) prior to each infusion with ELZONRIS. Withhold ELZONRIS temporarily if the transaminases rise to greater than 5 times the upper limit of normal and resume treatment upon normalization or when resolved. Adverse Reactions Most common adverse reactions (incidence ≥ 30%) are capillary leak syndrome, nausea, fatigue, pyrexia, peripheral edema, and weight increase. Most common laboratory abnormalities (incidence ≥ 50%) are decreases in albumin, platelets, hemoglobin, calcium, and sodium, and increases in glucose, ALT and AST. Please see full Prescribing Information, including Boxed WARNING.To report SUSPECTED ADVERSE REACTIONS, contact Stemline Therapeutics, Inc. at 1-877-332-7961 or contact the FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. About The Menarini GroupThe Menarini Group is a leading international pharmaceutical and diagnostics company, with a turnover of over $4.7 billion and over 17,000 employees. Menarini is focused on therapeutic areas with high unmet needs with products for cardiology, oncology, pneumology, gastroenterology, infectious diseases, diabetology, inflammation, and analgesia. With 18 production sites and 9 Research and Development centers, Menarini's products are available in 140 countries worldwide. For further information, please visit menarini.com. About Stemline Therapeutics Inc.Stemline Therapeutics, Inc. (“Stemline”), a wholly-owned subsidiary of the Menarini Group, is a commercial-stage biopharmaceutical company focused on bringing transformational oncology treatments to patients. Stemline commercializes elacestrant, an oral endocrine therapy indicated for the treatment of postmenopausal women or adult men with estrogen receptor (ER)-positive, human epidermal growth factor receptor 2 (HER2)-negative, ESR1-mutated advanced or metastatic breast cancer with disease progression following at least one line of endocrine therapy, in the U.S., Europe, and other global regions. Stemline also commercializes tagraxofusp-erzs, a novel targeted therapy directed to CD123, for patients with blastic plasmacytoid dendritic cell neoplasm (BPDCN), an aggressive hematologic cancer, in the United States, Europe, and other global regions. In addition, Stemline commercializes selinexor, an XPO1 inhibitor for multiple myeloma, in Europe. The company is also conducting multiple label-expansion studies with elacestrant and tagraxofusp in breast and hematologic cancer indications, respectively, and has an extensive clinical pipeline of additional drug candidates in various stages of development for a host of solid and hematologic cancers. About VisualDxVisualDx is a company dedicated to improving medical decisions through augmented thinking and timely visualization. It is committed to reducing disparities in medicine and believes technology can bridge gaps in knowledge to bring about more equitable care. VisualDx has become the standard professional resource at more than 2,300 hospitals, clinics and medical schools worldwide by combining problem oriented clinical search with the world's best curated medical image library, plus medical knowledge from experts and sophisticated machine learning algorithms to help with differential diagnosis, variation, treatment, and patient communication. Learn more at www.visualdx.com Media ContactsThe Menarini GroupValeria Speroni CardiEmail: pressoffice@menarini.com Stemline Therapeutics, Inc.Cheya PopeEmail: media@menarinistemline.com 1 Pagano L, et al Haematological. 2013;98 (2): 239-246 and Pemmaraju N Curr Hematol Malig Rep. 2017; 12(6): 510-512

- XPOVIO® is the first and only approved XPO1 inhibitor in Indonesia. - From the second half of 2024 to now, XPOVIO® was successively approved in Thailand, Malaysia and Indonesia, significantly expanding Antengene's commercial presence in APAC. To date, XPOVIO® has been approved for multiple indications in ten markets across the APAC region. - XPOVIO® has been approved for health insurance coverage in the mainland of China, Taiwan market, Australia, Singapore and South Korea. SHANGHAI and HONG KONG, March 5, 2025 /PRNewswire/ -- Antengene Corporation Limited ( "Antengene", SEHK: 6996.HK), a leading innovative, commercial-stage global biopharmaceutical company dedicated to discovering, developing and commercializing first-in-class and/or best-in-class medicines for cancer, today announced that the Indonesia National Agency of Drug and Food Control (BPOM) has approved a New Drug Application (NDA) for XPOVIO® (selinexor) for three indications: (1) In combination with bortezomib and dexamethasone for the treatment of adult patients with multiple myeloma (MM) who have received at least one prior therapy;(2) in combination with dexamethasone for the treatment of adult patients with relapsed or refractory MM (R/R MM) who have received at least four prior therapies and whose disease is refractory to at least two proteasome inhibitors (PIs), at least two immunomodulatory agents (IMiDs), and an anti‐CD38 monoclonal antibody; and (3) as a monotherapy for the treatment of adult patients with relapsed or refractory diffuse large B‐cell lymphoma (R/R DLBCL), not otherwise specified, including DLBCL arising from follicular lymphoma, after at least two lines of systemic therapy who are not eligible for haematopoietic cell transplant. With a novel mechanism of action, XPOVIO® is the world's first approved orally-available, selective XPO1 inhibitor, which has already been approved in ten countries and regions in APAC, and has been included in the national insurance schemes in five of these markets (the mainland of China, Taiwan market, Australia, Singapore and South Korea). The ASEAN region, with its steady economic growth and a population exceeding 600 million, has become a market of significant potential for global biomedical development. The accelerating aging population in ASEAN has increased the overall disease burden on patients and local communities, leading to a growing demand for novel therapeutics. Currently, Antengene is actively expanding its presence into APAC markets in efforts to introduce more innovative medicines to the ASEAN region in the future, improving the level of healthcare in these regions and benefiting more patients in need. While bringing XPOVIO® to more APAC markets, Antengene is also striving to expand the indications of XPOVIO®. Leveraging the drug's novel mechanism of action, Antengene is currently developing multiple combination regimens of XPOVIO® for the treatment of various indications including myelofibrosis (MF) and endometrial cancer. About XPOVIO® (selinexor) XPOVIO® is the world's first approved orally-available, selective inhibitor of the nuclear export protein XPO1. It offers a novel mechanism of action, synergistic effects in combination regimens, fast onset of action, and durable responses. By blocking the nuclear export protein XPO1, XPOVIO® can promote the intranuclear accumulation and activation of tumor suppressor proteins and growth regulating proteins, and down-regulate the levels of multiple oncogenic proteins. XPOVIO® delivers its antitumor effects through three mechanistic pathways: 1) exerting antitumor effects by inducing the intranuclear accumulation of tumor suppressor proteins; 2) reducing the level of oncogenic proteins in the cytoplasm by inducing the intranuclear accumulation of oncogenic mRNAs; 3) restoring hormone sensitivity by activating the glucocorticoid receptors (GR) pathway. To utilize its unique mechanism of actions, XPOVIO® is being evaluated for use in multiple combination regimens in a range of indications. At present, Antengene is conducting multiple clinical studies of XPOVIO® in the mainland of China for the treatment of relapsed/refractory hematologic malignancies and solid tumors (3 of these studies are being jointly conducted by Antengene and Karyopharm Therapeutics Inc. [Nasdaq:KPTI]). About Antengene Antengene Corporation Limited ( "Antengene", SEHK: 6996.HK) is a leading commercial-stage R&D-driven global biopharmaceutical company focused on the discovery, development, manufacturing and commercialization of innovative first-in-class/best-in-class therapeutics for the treatment of hematologic malignancies and solid tumors, in realizing its vision of "Treating Patients Beyond Borders". Since 2017, Antengene has built a pipeline of 9 oncology assets at various stages going from clinical to commercial, including 6 with global rights, and 3 with rights for the APAC region. To date, Antengene has obtained 31 investigational new drug (IND) approvals in the U.S. and Asia, and submitted 10 new drug applications (NDAs) in multiple Asia Pacific markets, with the NDA for XPOVIO® (selinexor) already approved in Mainland of China, Taiwan China, Hong Kong China, Macau China, South Korea, Singapore, Malaysia, Thailand, Indonesia and Australia. Forward-looking statements The forward-looking statements made in this article relate only to the events or information as of the date on which the statements are made in this article. Except as required by law, we undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise, after the date on which the statements are made or to reflect the occurrence of unanticipated events. You should read this article completely and with the understanding that our actual future results or performance may be materially different from what we expect. In this article, statements of, or references to, our intentions or those of any of our Directors or our Company are made as of the date of this article. Any of these intentions may alter in light of future development. For a further discussion of these and other factors that could cause future results to differ materially from any forward-looking statement, please see the other risks and uncertainties described in the Company's Annual Report for the year ended December 31, 2023, and the documents subsequently submitted to the Hong Kong Stock Exchange. For more information, please contact: Investor Contacts: Donald Lung E-mail: [email protected] Mobile: +86 18420672158 PR Contacts: Peter Qian E-mail: [email protected] Mobile: +86 13062747000 SOURCE Antengene Corporation Limited WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED

Several clinical studies of the therapy are underway in mainland China. Credit: Chay_Tee/Shutterstock. Antengene’s new drug application (NDA) for Xpovio (selinexor) has gained approval from the Indonesia National Agency of Drug and Food Control for three indications. The approval paves the way for Xpovio to be used in conjunction with other therapies and as a monotherapy in specific cancer treatments. The approval for the indications is in conjunction with bortezomib and dexamethasone for treating adults with multiple myeloma (MM) who have undergone a minimum of one previous treatment. Xpovio can also be used as a single agent to treat adults with relapsed or refractory diffuse large B-cell lymphoma (R/R DLBCL), including DLBCL which arises from follicular lymphoma, after a minimum of two systematic therapy lines. Xpovio with dexamethasone is approved for treating adults with R/R MM who have undergone at least four previous therapies and whose disease is refractory to a minimum of two proteasome inhibitors (PIs), two immunomodulatory agents (IMiDs) and an anti‐cluster of differentiation 38 (CD38) monoclonal antibody. With this new approval, the therapy extends its reach in the Asia Pacific (APAC) region, in which it has already been approved in 10 nations and included in national insurance schemes in five markets. Antengene is currently working on broadening the therapy’s presence, aiming to introduce more medicines to the Association of Southeast Asian Nations (ASEAN) region. The company is focused both on widening the market reach of Xpovio and on expanding its indications. It is exploring several combo regimens of the therapy for conditions including myelofibrosis and endometrial cancer. Several clinical studies are underway in mainland China to evaluate Xpovio in treating relapsed/refractory haematologic malignancies and solid tumours. Three of these are being conducted jointly by Antengene and Karyopharm Therapeutics. In July 2024, China’s National Medical Products Administration approved Xpovio as a monotherapy for treating adults with R/R DLBCL.