Karyopharm to Host Conference Call with Update on Multiple Myeloma Plans

NEWTON, Mass., Aug. 30, 2016 -- Karyopharm Therapeutics Inc. (Nasdaq:KPTI), a clinical-stage pharmaceutical company, today announced it will provide an overview of top-line results from its Phase 2b STORM study and the planned development path for selinexor (KPT-330) in multiple myeloma (MM) on Tuesday, September 6, 2016, followed by a conference call on Tuesday, September 6, 2016 at 8:30 a.m., Eastern time.  To access the conference call, please dial (855) 437-4406 (US) or (484) 756-4292 (international) at least five minutes prior to the start time and refer to conference ID: 74213103.  Accompanying slides will be available under "Events & Presentations" in the "Investor" section of Karyopharm's website, http://www.karyopharm.com, where an audio recording of the call will be available approximately two hours after the event.

Karyopharm today confirmed that, as had been reported on clinicaltrials.gov, it intends to expand its Phase 2b STORM study evaluating the activity of selinexor in multiple myeloma (MM) to include approximately 120 additional patients with penta-refractory MM.  Patients with penta-refractory myeloma have previously received two proteasome inhibitors (PIs) (bortezomib (Velcade®) and carfilzomib (Kyprolis®)) and two immunomodulatory agents (IMiDs) (lenalidomide (Revlimid®) and pomalidomide (Pomalyst®)), and their disease is refractory to at least one PI, at least one IMiD and an anti-CD38 monoclonal antibody, such as daratumumab (Darzalex™) or isatuximab, and has progressed following their most recent therapy.  Selinexor, the Company’s lead, novel, oral Selective Inhibitor of Nuclear Export / SINE™ compound, is being developed for the treatment of a variety of malignancies, including MM.

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). 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, which was founded by Dr. Sharon Shacham, currently has several investigational programs in clinical or preclinical development. For more information, please visit www.karyopharm.com.

Forward-Looking Statements
This press release contains forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Such forward-looking statements include those regarding the therapeutic potential of and potential clinical development plans for Karyopharm's drug candidates, including the reporting of data from such trials. Such statements are subject to numerous important factors, risks and uncertainties that may cause actual events or results to differ materially from the Company's current expectations. For example, there can be no guarantee that selinexor (KPT-330) will successfully complete necessary preclinical and clinical development phases or that development of selinexor will continue.  Management's expectations and, therefore, any forward-looking statements in this press release could also be affected by risks and uncertainties relating to a number of other factors, including the following: Karyopharm's results of clinical trials and preclinical studies, including subsequent analysis of existing data and new data received from ongoing and future studies; the content and timing of decisions made by the U.S. Food and Drug Administration and other regulatory authorities, investigational review boards at clinical trial sites and publication review bodies, including with respect to the need for additional clinical studies; Karyopharm's ability to obtain and maintain requisite regulatory approvals and to enroll patients in its clinical trials; unplanned cash requirements and expenditures; development of drug candidates by Karyopharm's competitors for diseases in which Karyopharm is currently developing its drug candidates; and Karyopharm's ability to obtain, maintain and enforce patent and other intellectual property protection for any drug candidates it is developing. These and other risks are described under the caption "Risk Factors" in Karyopharm's Quarterly Report on Form 10-Q for the quarter ended June 30, 2016, which was filed with the Securities and Exchange Commission (SEC) on August 4, 2016, and in other filings that Karyopharm may make with the SEC in the future. Any forward-looking statements contained in this press release speak only as of the date hereof, and Karyopharm expressly disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

Velcade® is a registered trademark of Takeda Pharmaceutical Company Limited
Revlimid® and Pomalyst® are registered trademarks of Celgene Corporation
Kyprolis® is a registered trademark of Onyx Pharmaceuticals, Inc.
Darzalex™ is a trademark of Janssen Biotech, Inc.

Contact:
Justin Renz
(617) 658-0574
[email protected]

Gina Nugent
(617) 460-3579
[email protected]