Mehdi v. Karyopharm Therapeutics Inc.

CourtDistrict Court, D. Massachusetts
DecidedJuly 21, 2021
Docket1:19-cv-11972
StatusUnknown

This text of Mehdi v. Karyopharm Therapeutics Inc. (Mehdi v. Karyopharm Therapeutics Inc.) is published on Counsel Stack Legal Research, covering District Court, D. Massachusetts primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Mehdi v. Karyopharm Therapeutics Inc., (D. Mass. 2021).

Opinion

United States District Court District of Massachusetts

) ) ) ) ) In re: Karyopharm Therapeutics ) Inc., Securities Litigation ) Civil Action No. ) 19-11972-NMG ) ) ) )

MEMORANDUM & ORDER GORTON, J. This is a putative securities fraud class action brought by lead plaintiff Dr. Myo Thant (“Dr. Thant” or “plaintiff”) on behalf of himself and other similarly situated investors against Karyopharm Therapeutics Inc. (“Karyopharm” or “defendant”) and several Karyopharm directors and executive officers (“the Individual Defendants”) (collectively, “defendants”). Dr. Thant alleges that Karyopharm investors have been harmed because they purchased the company’s common stock at prices that were artificially inflated by defendants materially misleading statements and omissions about selinexor, its leading drug candidate for the treatment of certain advanced cancers. Pending before the Court is defendants’ motion to dismiss the second amended complaint (“the SAC”) for failure to state a claim. For the reasons that follow, that motion will be allowed and the SAC will be dismissed without prejudice. I. Background

The following summary is based upon the factual allegations stated in the second amended complaint which are accepted as true for the purpose of the pending motion to dismiss. Karyopharm is a Massachusetts-based, commercial-stage biopharmaceutical company that develops and commercializes treatments for cancer and other serious diseases. Plaintiff is a Maryland resident who supposedly purchased and retained Karyopharm securities in or traceable to the public offerings of the company’s common stock conducted in or about April, 2017, and May, 2018. He contends that the purchase price of those securities was artificially inflated because Karyopharm executives made several misrepresentations and omissions with

respect to the safety and efficacy of selinexor between March 2, 2017, and February 22, 2019 (“the Class Period”). Also during that period, i.e. in August, 2018, Karyopharm submitted to the Food and Drug Administration (“the FDA”) a new drug application (“NDA”) for selinexor in combination with dexamethasone for the treatment of multiple myeloma in adults who have received at least three prior cancer treatments or therapies. Six months later, on or about February 22, 2019, the FDA publicly released a briefing document (“the February briefing document”), apparently revealing a long history of toxicity and limited efficacy of selinexor. Karyopharm’s stock price subsequently plummeted from a closing price of $8.97 per

share on February 21, 2019, to $5.07 per share the next day. Four days after that, the FDA convened its Oncologic Drug Advisory Committee (“ODAC”) which voted to delay the approval of selinexor pending additional data from the company’s Phase 3 clinical trial, BOSTON, causing Karyopharm’s stock price to fall farther to $4.13 per share. Thereafter, Karyopharm amended its NDA for selinexor, narrowing the group of potential patients to those suffering from multiple myeloma who have received at least four (rather than three) prior lines of treatment, a population for which there was no approved therapy. In July, 2019, the FDA approved selinexor for that indication and, by the time this lawsuit was

filed in September, 2019, the price of the company’s common stock had risen to $11.67 per share. A. The Clinical Trials and Alleged Misleading Statements

1. Phase 1 The company initiated Phase 1 clinical testing for selinexor in 2012, primarily evaluating the toxicity, safety and tolerability of the drug in patients with multiple myeloma and acute myeloid leukemia (“AML”), among other types of cancer. The trial consisted of several study-arms and cohorts, three arms of which studied the drug with respect to patients with multiple myeloma who had received at least three prior lines of cancer treatment or therapy. Patients received selinexor either

alone (monotherapy) or in combination with different doses of dexamethasone, a steroid often used in combination with cancer treatments. During Phase 1, several patients had to discontinue treatment with selinexor prematurely due to adverse reactions caused by the drug’s toxicity. Furthermore, as to the 56 multiple myeloma patients receiving monotherapy, only one responded to the treatment, i.e. 55 out of 56 patients showed no signs of effective treatment. Karyopharm, nonetheless, proceeded to Phase 2 testing for selinexor, commencing the SOPRA trial in June, 2014, and STORM in May, 2015. 2. SOPRA

SOPRA (Selinexor in Older Patients with Relapsed/Refractory AML) was designed primarily to treat patients 60 years or older suffering from AML who were ineligible for standard intensive chemotherapy and/or transplantation. Trial participants received either a fixed dose of selinexor twice per week or standard treatment from their physicians. According to the FDA, the trial data reported a median overall survival rate for selinexor-treated patients of 94 days, compared to 170 days for patients receiving standard care. It also purportedly showed that 100% of the evaluable patients who received the drug experienced some adverse event (“AE”), 80% experienced a serious AE and 20% suffered from an AE that resulted in death.

Thus, on March 2, 2017, Karyopharm announced in a press release that it would be terminating the SOPRA trial (“the SOPRA press release”). The disclosed reasons for the termination were not the drug’s toxicity but, instead, that the study did not reach statistical significance on its primary endpoint, i.e. superiority of overall survival (“OS”) on selinexor as compared to standard treatment. In that press release, the company added that, since selinexor-treated patients that achieved a complete response (CR) showed a substantial OS benefit as compared with the physician’s choice (PC) arm, Karyopharm and the [independent Data Safety Monitoring Board (“DSMB”)] agreed that patients would be permitted to continue on the selinexor arm or the PC arm, as applicable, following discussion between the patient and their treating physician . . .

. . . Among patients on the selinexor arm, 13% demonstrated a CR with or without full hematologic recovery (CRi) compared to 3% of patients on the PC control arm. Some patients remained on selinexor for over one year, but this did not result in a statistically superior OS compared to the PC arm. The DSMB found no new clinically significant AEs in the patients receiving selinexor. Importantly, rates of sepsis and febrile neutropenia, or FN, were lower on the selinexor arm (sepsis 4.9%, FN 14.7%) compared to the PC arm (sepsis 6.1%, FN 36.4%). As expected, the most common selinexor-related adverse events were nausea, anorexia, fatigue, vomiting, and thrombocytopenia.

The press release added that “60mg of single-agent selinexor dosed twice per week was well-tolerated”. The SAC does not contend that those reported statistics are false but, instead, avers that the statements, as a whole, are materially misleading because they omit material information and

apparently contradict the trial data which plaintiff alleges shows a lack of efficacy, high toxicity and worse overall survival with selinexor compared to patients receiving standard care. 3. STORM STORM (Selinexor Treatment of Refractory Myeloma), on the other hand, tested the safety and efficacy of selinexor in combination with low-dose dexamethasone for the treatment of heavily pre-treated patients with penta-refractory myeloma. In contrast to SOPRA, STORM was a single-arm study in that its data was not compared to a control-group arm. Nor did it evaluate selinexor when used by itself.

Upon receipt of the STORM study data, Karyopharm expressed to its investors confidence in the results.

Free access — add to your briefcase to read the full text and ask questions with AI

Related

Ernst & Ernst v. Hochfelder
425 U.S. 185 (Supreme Court, 1976)
Dura Pharmaceuticals, Inc. v. Broudo
544 U.S. 336 (Supreme Court, 2005)
Tellabs, Inc. v. Makor Issues & Rights, Ltd.
551 U.S. 308 (Supreme Court, 2007)
Bell Atlantic Corp. v. Twombly
550 U.S. 544 (Supreme Court, 2007)
Ashcroft v. Iqbal
556 U.S. 662 (Supreme Court, 2009)
Glassman v. Computervision Corp.
90 F.3d 617 (First Circuit, 1996)
Greebel v. FTP Software, Inc.
194 F.3d 185 (First Circuit, 1999)
Hill v. Gozani
638 F.3d 40 (First Circuit, 2011)
Matrixx Initiatives, Inc. v. Siracusano
131 S. Ct. 1309 (Supreme Court, 2011)
Ocasio-Hernandez v. Fortuno-Burset
640 F.3d 1 (First Circuit, 2011)
Haley v. City of Boston
657 F.3d 39 (First Circuit, 2011)
In Re Morgan Stanley Information Fund Securities
592 F.3d 347 (Second Circuit, 2010)
In Re the First Marblehead Corp. Securities Litigation
639 F. Supp. 2d 145 (D. Massachusetts, 2009)
In Re Zyprexa Products Liability Litigation
549 F. Supp. 2d 496 (E.D. New York, 2008)
In Re Parametric Technology Corp. Securities Litigation
300 F. Supp. 2d 206 (D. Massachusetts, 2001)
Deka Int'l S.A. Luxemborg v. Genzyme Corp.
754 F.3d 31 (First Circuit, 2014)

Cite This Page — Counsel Stack

Bluebook (online)
Mehdi v. Karyopharm Therapeutics Inc., Counsel Stack Legal Research, https://law.counselstack.com/opinion/mehdi-v-karyopharm-therapeutics-inc-mad-2021.