Karyopharm and Menarini Group Receive Full Marketing Authorisation from the European Commission for NEXPOVIO® (selinexor) for the Treatment of Patients with Multiple Myeloma After at Least One Prior Therapy

– Based on Results from Phase 3 BOSTON Study, Marketing Authorisation Expands Multiple Myeloma Indication –

– Approval Follows Positive Opinion by European Committee for Medicinal Products for Human Use (CHMP) in May 2022 –

NEWTON, MA, USA and FLORENCE, Italy I July 21, 2022 I Karyopharm Therapeutics Inc. (Nasdaq:KPTI), a commercial-stage pharmaceutical company pioneering novel cancer therapies, and the Menarini Group ("Menarini"), a privately-held, leading international pharmaceutical company, today announced that the European Commission (EC) has granted Marketing Authorisation for NEXPOVIO® (selinexor), a first-in-class, oral exportin 1 (XPO1) inhibitor, in combination with once-weekly bortezomib (Velcade®) and low-dose dexamethasone (SVd) for the treatment of adults with multiple myeloma who have received at least one prior therapy. With this approval for the extension of NEXPOVIO®'s indication in the European Union (EU), the conditional marketing authorisation is now converted to a full approval. The marketing authorisation, which marks the second indication for NEXPOVIO®, is valid in all 27 member states of the EU as well as Iceland, Liechtenstein, Norway, and Northern Ireland. Stemline Therapeutics B.V., a wholly owned subsidiary of the Menarini Group, will be responsible for all commercialization activities in Europe.

The approval follows a positive opinion granted in May 2022 by the CHMP based on results from the Phase 3 BOSTON study that demonstrated once-weekly SVd resulted in a statistically significant reduction in the risk of disease progression or death compared to standard twice-weekly bortezomib plus dexamethasone (Vd) regimen. The results from the BOSTON study were published in The Lancet (Grosicki, et al.) in November 2020.

"The European Commission's approval of an expanded use of NEXPOVIO® provides another option for patients with multiple myeloma who have relapsed, or become resistant to current treatment regimens," said Richard Paulson, President and Chief Executive Officer of Karyopharm. "Our decision to pursue approval for this patient population is indicative of our commitment to expand access to selinexor across the globe and we look forward to working closely with Menarini who will commercialize NEXPOVIO® in Europe."

"The approval of NEXPOVIO® marks an important step forward for patients in Europe where nearly 51,000 new cases of multiple myeloma are diagnosed each year and therapeutic options are limited," said Elcin Barker Ergun, Chief Executive Officer of Menarini. "We are committed to offering patients and physicians a valuable new treatment option and are working hard to make NEXPOVIO® available in different European countries as quickly as possible."

About the BOSTON study    

The Marketing Authorisation is based upon the Phase 3 BOSTON (Bortezomib, Selinexor and Dexamethasone) study, which was a multi-center, randomized study (NCT03110562) that evaluated 402 adult patients with relapsed or refractory multiple myeloma who had received one to three prior lines of therapy. The study was designed to compare the efficacy, safety and certain health-related quality of life parameters of once-weekly SVd versus twice-weekly Vd. The primary endpoint of the study was progression-free survival and key secondary endpoints included overall response rate, rate of peripheral neuropathy, and others. To learn more about this study, please refer to  Karyopharm and Menarini's press release on the positive CHMP opinion issued on May 20, 2022.

About Multiple Myeloma in Europe

Multiple myeloma is an incurable cancer with significant morbidity and the second most common hematologic malignancy. According to the World Health Organization, in 2020, there were approximately 51,000 new cases and 32,000 deaths from multiple myeloma in Europe1. While the treatment of multiple myeloma has improved over the last 20 years, and overall survival has increased considerably, the disease remains incurable, and nearly all patients will eventually relapse and develop disease that is refractory to all approved anti-myeloma therapies. Therefore, there continues to be a high unmet medical need for new therapies, particularly those with novel mechanisms of action.

About NEXPOVIO® (selinexor)

NEXPOVIO®, which is marketed as XPOVIO® in the U.S., has been approved in the following oncology indications by the European Commission: (i) in combination with dexamethasone for the treatment of multiple myeloma in adult patients who have received at least four prior therapies and whose disease is refractory to at least two proteasome inhibitors, two immunomodulatory agents and an anti-CD38 monoclonal antibody, and who have demonstrated disease progression on the last therapy; and (ii) in combination with bortezomib and dexamethasone for the treatment of adults with multiple myeloma who have received at least one prior therapy.

The expanded NEXPOVIO® indication now allows adult patients with multiple myeloma to be treated in earlier lines of therapy. The indication for NEXPOVIO® is valid in the EU Member States as well as Iceland, Liechtenstein, Norway, and Northern Ireland. NEXPOVIO® is also approved in the UK under a Conditional Marketing Authorisation. The extension of indication in combination with bortezomib and dexamethasone for the treatment of adults with multiple myeloma who have received at least one prior therapy is currently under review by Medicines and Healthcare Products Regulatory Agency.

NEXPOVIO® is a first-in-class, oral exportin 1 (XPO1) inhibitor. NEXPOVIO® functions by selectively binding to and inhibiting the nuclear export protein exportin 1 (XPO1, also called CRM1). NEXPOVIO® 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.

Please see NEXPOVIO® Summary of Product Characteristics and European Public Assessment Report at https://ec.europa.eu/health/documents/community-register/html/h1537.htm

About Karyopharm Therapeutics

Karyopharm Therapeutics Inc. (Nasdaq: KPTI) is a commercial-stage pharmaceutical company pioneering novel cancer therapies. Since its founding, Karyopharm has been the industry leader in oral Selective Inhibitor of Nuclear Export (SINE) compound technology, which was developed to address a fundamental mechanism of oncogenesis: nuclear export dysregulation. Karyopharm's lead SINE compound and first-in-class, oral exportin 1 (XPO1) inhibitor, XPOVIO® (selinexor), is approved in the U.S. and marketed by the Company in three oncology indications and has received regulatory approvals in various indications in a growing number of ex-U.S. territories and countries, including Europe and the United Kingdom (as NEXPOVIO®), China, Singapore, Canada, Israel, South Korea, and Australia. Karyopharm has a focused pipeline targeting multiple high unmet need cancer indications, including in multiple myeloma, endometrial cancer, myelodysplastic syndromes and myelofibrosis. For more information about our people, science and pipeline, please visit www.karyopharm.com, and follow us on Twitter at @Karyopharm and LinkedIn.

About Menarini Group

The Menarini Group is a leading international pharmaceutical and diagnostics company, with a turnover of over $4 billion and over 17,000 employees. Menarini is focused on therapeutic areas with high unmet needs with products for oncology, cardiology, 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 www.menarini.com.

References

1 World Health Organization. 2020. https://gco.iarc.fr/today/data/factsheets/cancers/35-Multiple-myeloma-fact-sheet.pdf

SOURCE: Karyopharm Therapeutics

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