Sierra Oncology (SRRA) Announces Momelotinib Achieved Statistically Significant Benefit on Symptoms, Anemia and Splenic Size in the Pivotal MOMENTUM Study for Myelofibrosis

January 25, 2022 7:01 AM EST
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Sierra Oncology, Inc. (NASDAQ: SRRA), a late-stage biopharmaceutical company dedicated to delivering targeted therapies for rare cancers, today announced positive topline data from the pivotal Phase 3 MOMENTUM study—a global, randomized, double-blind clinical trial evaluating momelotinib (MMB) in myelofibrosis patients who are symptomatic and anemic and previously treated with an approved JAK inhibitor. The trial met all of its primary and key secondary endpoints.

“These data are extremely exciting and everything we had hoped to see from the trial,” said Stephen Dilly, MBBS, PhD, President and Chief Executive Officer of Sierra Oncology. “To achieve statistically significant and clinically important efficacy across all prespecified primary and key secondary endpoints while maintaining platelet counts in such a difficult to treat patient population is remarkable, and a confirmation of the anemia response we identified in the comprehensive review of our previous Phase 3 studies.”

Topline data announced based on 195 patients (MMB n = 130; DAN n = 65) include:

  • Primary Endpoint of Total Symptom Score (TSS) of >50%: 25% in the MMB arm vs. 9% in the control arm (p=0.0095)
  • Secondary Endpoint of Transfusion Independence (TI): 31% in the MMB arm vs. 20% in the control arm (one-sided p=0.0064; non-inferiority)
  • Secondary Endpoint of Splenic Response Rate (SRR) >35%: 23% in the MMB arm vs. 3% in the control arm (p=0.0006)
  • The rate of Grade 3 or worse adverse events in the randomized treatment period was 54% in the MMB arm and 65% in the control arm. Serious treatment emergent adverse events were 35% in the MMB arm and 40% in the control arm.
  • Mean baseline characteristics for all patients were TSS of 27, Hemoglobin (Hgb) of 8 g/dL and platelet count of 145 x 10 9/L
  • The full data set will be presented at an upcoming medical meeting

“As a clinician, I am thrilled to see data that confirm the potential of momelotinib as a treatment option for myelofibrosis patients who are anemic or at risk of becoming anemic,” said Ruben Mesa, MD, FACP, Executive Director of the Mays Cancer Center, home to UT Health San Antonio, MD Anderson Cancer Center, and co-Principal Investigator of the study. “Anemia of myelofibrosis is strongly correlated with reduced quality of life and a decrease in overall survival. Half of all myelofibrosis patients present with anemia at diagnosis and virtually all become anemic over time. With currently approved therapies being myelosuppressive, it’s wonderful to know that we may soon have such an effective treatment option for these patients.”

Barbara Klencke, MD, Chief Medical Officer of Sierra Oncology, stated, “We are committed to working tirelessly to bring momelotinib to patients as quickly as possible. We would like to thank the patients and investigators who participated in this study and look forward to presenting the full data set at an upcoming medical meeting.”

Conference Call & Webcast
In connection with this announcement, Sierra will host a conference call and webcast on Tuesday, January 25, 2022, at 8:00 am ET. The call may be accessed by calling (833) 927-1758 (Toll-free in North America) or +1 (929) 526-1599 (International Dial-in) and entering the Conference ID number: 007608. The call will be webcast live and will be accessible through the Investor section of the Company’s website at An archived replay of the webcast will be made available at the same location.

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