Press Release

Jul 03, 2019

Karyopharm Announces FDA Approval of XPOVIO™ (selinexor) for the Treatment of Patients with Relapsed or Refractory Multiple Myeloma

-- XPOVIO is the First and Only Nuclear Export Inhibitor Approved by the FDA

-- XPOVIO is the First and Only Prescription Medicine Approved by the FDA for the Treatment of Patients with Multiple Myeloma whose Disease is Refractory to Proteasome Inhibitors, Immunomodulatory Agents, and an Anti-CD38 Monoclonal Antibody

NEWTON, Mass. and SHANGHAI, China - July 03, 2019 (GLOBE NEWSWIRE) -- Karyopharm Therapeutics Inc. (Nasdaq:KPTI), an oncology-focused pharmaceutical company, today announced that the U.S. Food and Drug Administration (FDA) has approved oral XPOVIOTM (selinexor, Antengene Corporation product code ATG-010), a nuclear export inhibitor, in combination with dexamethasone for the treatment of adult patients with relapsed or refractory multiple myeloma (RRMM) who have received at least four prior therapies and whose disease is refractory to at least two proteasome inhibitors, at least two immunomodulatory agents, and an anti-CD38 monoclonal antibody. This indication is approved under accelerated approval based on response rate. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial. The ongoing, randomized Phase 3 BOSTON study evaluating selinexor in combination with Velcade® (bortezomib) and low-dose dexamethasone will serve as the confirmatory trial. The FDA’s Accelerated Approval Program was developed to allow for expedited approval of drugs that treat serious conditions and that fill an unmet medical need.

“The 25.3% response rate seen in the subgroup of 83 patients in the pivotal Phase 2b STORM study that served as the basis for XPOVIO's accelerated approval is clinically meaningful and a validated surrogate marker for clinical benefit in our patients with advanced refractory disease,” said Sundar Jagannath, MD, Director of the Multiple Myeloma Program, Professor of Medicine (Hematology and Medical Oncology) at Tisch Cancer Institute at Mount Sinai School of Medicine, and principal investigator of the STORM study.

“Despite recent advances in the treatment of multiple myeloma, almost all our patients will develop disease that is resistant to the five most commonly used anti-myeloma drugs we currently have available, and the prognosis for this patient population is particularly poor. The accelerated approval of oral XPOVIO marks an important advance in the treatment paradigm for patients with relapsed refractory multiple myeloma, and in my view, is an important addition to our therapeutic armamentarium,” said Dr. Paul Richardson, MD, Clinical Program Leader and Director of Clinical Research, Jerome Lipper Multiple Myeloma Center at the Dana-Farber Cancer Institute.

“The news that XPOVIOTM(selinexor) has been approved by the FDA is very encouraging. For relapsed and refractory multiple myeloma, Chinese patients also need a novel mechanism of innovative therapy. For the urgent needs of Chinese patients, we feel the great responsibility and the urgency of time. XPOVIO™ (selinexor) has been approved by Drug Administration for clinical trials in China to treat patients with relapsed or refractory multiple Myeloma, and patients are expected to start receiving treatment in August this year. In addition, we will continue to study Selinexor in the treatment of a variety of other hematological and solid tumors, including diffuse large B lymphoma, T-cell lymphoma, endometrial cancer and glioma. We look forward to bringing this innovative drug to Chinese patients as soon as possible.” said Dr. Jay Mei, founder, chairman, and CEO of Antengene.

“With today’s accelerated approval of XPOVIO by the FDA, patients with heavily pretreated multiple myeloma will now have a new therapeutic option to treat their disease,” said Sharon Shacham, PhD, MBA, Founder, President and Chief Scientific Officer of Karyopharm, Antengene’s partner. “Discovering, developing and securing FDA approval for XPOVIO with its novel mechanism of action over the past decade required the dedication of many people, including the patients, caregivers and physicians involved in our clinical trials, along with the many employees at Karyopharm. We are tremendously grateful for everyone’s contributions to this important milestone, and we look forward to the next stage in our pursuit of improving the lives of patients with cancer.”

On May 29 2018, Antengene Corporation and Karyopharm Therapeutics entered into a broad strategic partnership in Shanghai, jointly developing four of Karyopharm’s clinical-stage, novel, oral drug candidates, including TG-010(XPOVIOTM,selinexor). After the collaboration, ATG-010 obtained the clinical approval document from State Food and Drug Administration on January 28, 2019, and will start the clinical trial in August this year. It is reported that in addition to continuously promoting the research and development of related indications of ATG-010 except multiple myeloma, Antengene is establishing a commercial team to actively prepare for the listing of selinexor and its follow-up products.

About XPOVIO (selinexor)

XPOVIO is a first-in-class, oral Selective Inhibitor of Nuclear Export (SINE) compound. XPOVIO functions by selectively binding to and inhibiting the nuclear export protein exportin 1 (XPO1, also called CRM1). XPOVIO blocks the nuclear export of tumor suppressor, growth regulatory and anti-inflammatory proteins, leading to accumulation of these proteins in the nucleus and enhancing their anti-cancer activity in the cell. The forced nuclear retention of these proteins can counteract a multitude of the oncogenic pathways that, unchecked, allow cancer cells with severe DNA damage to continue to grow and divide in an unrestrained fashion. In addition to receiving accelerated FDA approval of XPOVIO in July 2019 in combination with dexamethasone for the treatment of adult patients with relapsed refractory multiple myeloma (RRMM) who have received at least four prior therapies and whose disease is refractory to at least two proteasome inhibitors, at least two immunomodulatory agents, and an anti-CD38 monoclonal antibody, Karyopharm has also submitted a Marketing Authorization Application (MAA) to the European Medicines Agency (EMA) with a request for conditional approval of selinexor. Selinexor is also being studied in patients with relapsed or refractory diffuse large B-cell lymphoma (DLBCL). In 2018, Karyopharm reported positive top-line results from the Phase 2b SADAL study evaluating selinexor in patients with relapsed or refractory DLBCL after at least two prior multi-agent therapies and who are ineligible for transplantation, including high dose chemotherapy with stem cell rescue. Selinexor has received Fast Track designation from the FDA for the patient population evaluated in the SADAL study. Selinexor is also being evaluated in several other mid-and later-phase clinical trials across multiple cancer indications, including in multiple myeloma in a pivotal, randomized Phase 3 study in combination with Velcade® (bortezomib) and low-dose dexamethasone (BOSTON), as a potential backbone therapy in combination with approved therapies (STOMP), in liposarcoma (SEAL), in recurrent gliomas (KING) and in endometrial cancer (SIENDO), among others. Additional Phase 1, Phase 2 and Phase 3 studies are ongoing or currently planned, including multiple studies in combination with approved therapies in a variety of tumor types to further inform Karyopharm's clinical development priorities for selinexor. Additional clinical trial information for selinexor is www.clinicaltrials.gov.

About Karyopharm Therapeutics

Karyopharm Therapeutics Inc. (Nasdaq:KPTI) is a clinical-stage pharmaceutical company focused on the discovery and development of novel first-in-class drugs directed against nuclear transport and related targets for the treatment of cancer and other major diseases. Karyopharm's SINE compounds function by binding with and inhibiting the nuclear export protein XPO1 (or CRM1). Karyopharm’s lead compound, XPOVIOTM (selinexor), received accelerated approval from the FDA on 3rd July 2019 in combination with dexamethasone as a treatment for patients with relapsed or refractory multiple myeloma (RRMM). A Marketing Authorization Application for selinexor is also currently under review by the European Medicines Agency (EMA). In addition to single-agent and combination activity against a variety of human cancers, SINE compounds have also shown biological activity in models of neurodegeneration, inflammation, autoimmune disease, certain viruses and wound-healing. Karyopharm currently has several investigational programs in clinical or preclinical development. For more information, please visit www.karyopharm.com.

About Antengene

Antengene Corporation is a biopharmaceutical company focused on drug discovery, clinical development and the commercialization of innovative therapeutics to meet unmet medical needs. Antengene aims to provide the most advanced and first-in-class anti-cancer drug treatments for patients around the world. On April 13, 2017, Celgene Corporation (NASDAQ: CELG), a global leading innovative biopharmaceutical company became a long-term strategic partner and obtained an equity position in Antengene. Antengene's pipeline includes six commercial and clinical stage products: ATG-010 (selinexor), in combination with the corticosteroid dexamethasone, has been approved by the U.S. Food and Drug Administration, for the treatment of adult patients with relapsed or refractory multiple myeloma. The compound is also in late clinical development for various other hematologic malignancies and solid tumors. ATG-008, a second-generation dual mTORC1/2 inhibitor, is in a multi-regional clinical trial for treatment of hepatocellular carcinoma and multiple other solid tumors. Two other Phase 1 and Phase 2 clinical stage drugs, ATG-016 and ATG-019, are being studied in multiple cancer types, including MDS, colorectal and prostate cancers. ATG-527 is being explored for multiple anti-viral indications, including respiratory syncytial virus (RSV), and Epstein-Barr virus (EBV) related diseases, etc. ATG-017 is a potent and selective small molecule extracellular signal–regulated kinases 1 and 2 (ERK1/2) inhibitor, in clinical development for multiple solid tumors. Antengene drug discovery team focuses on development of first-in-class novel products.