$CTIC EMA Validation of Pacritinib Marketing Authorization Application in Myelofibrosis

SEATTLE, July 13, 2017 — CTI BioPharma Corp. (NASDAQ and MTA: CTIC) today announced that European Medicines Agency (EMA) has validated the Marketing Authorization Application (MAA) for pacritinib for the treatment of patients with myelofibrosis who have thrombocytopenia (platelet counts less than 100,000 per microliter). Validation confirms that the submission is complete and initiates the centralized review process by the EMA’s Committee for Medicinal Products for Human Use (CHMP).  The CHMP review period is 210 days, excluding question or opinion response periods, after which the CHMP opinion is reviewed by the European Commission, which usually issues a final decision on EU authorization within three months. If authorized, pacritinib would be granted a marketing license valid in all 28 EU member states.

“The MAA validation is a significant milestone for CTI BioPharma as we seek to bring pacritinib to patients with myelofibrosis who have thrombocytopenia that could benefit from its unique profile,” said Adam R. Craig, M.D., Ph.D., President and CEO of CTI BioPharma. “We look forward to working with the CHMP/EMA during their review of this application.”

The MAA is primarily supported by data from two randomized Phase 3 clinical trials, PERSIST-1 and PERSIST-2, that evaluated pacritinib in patients with myelofibrosis.

About Pacritinib 

Pacritinib is an investigational oral kinase inhibitor with specificity for JAK2, FLT3, IRAK1 and CSF1R. The JAK family of enzymes is a central component in signal transduction pathways, which are critical to normal blood cell growth and development, as well as inflammatory cytokine expression and immune responses. Mutations in these kinases have been shown to be directly related to the development of a variety of blood-related cancers, including myeloproliferative neoplasms, leukemia and lymphoma. In addition to myelofibrosis, the kinase profile of pacritinib suggests its potential therapeutic utility in conditions such as acute myeloid leukemia, or AML, myelodysplastic syndrome, or MDS, chronic myelomonocytic leukemia, or CMML, and chronic lymphocytic leukemia, or CLL, due to its inhibition of c-fms, IRAK1, JAK2 and FLT3.

Pacritinib was evaluated in two Phase 3 clinical trials, known as the PERSIST program, for patients with myelofibrosis, with one trial in a broad set of patients without limitations on platelet counts, the PERSIST-1 trial; and the other in patients with low platelet counts, the PERSIST-2 trial. The PERSIST-1 trial met its primary endpoint of spleen volume reduction (35 percent or greater from baseline to Week 24 by MRI/CT scan). The PERSIST-2 trial met one of its co-primary endpoints, that of spleen volume reduction. The co-primary endpoint of reduction of Total Symptom Score (TSS) was not achieved but trended toward improvement in TSS.

Clinical studies under the investigational new drug (IND) for pacritinib were subject to a full clinical hold issued by the FDA in February 2016. In January 2017, the FDA removed the full clinical hold and stated that clinical trials may resume. CTI BioPharma is initiating a Phase 2 dose exploration study that was a condition of the clinical hold being removed.

About Myelofibrosis and Myeloproliferative Neoplasms

Myelofibrosis is one of three main types of myeloproliferative neoplasms (MPN), which are a closely related group of progressive blood cancers. The three main types of MPNs are primary myelofibrosis (PMF), polycethemia vera (PV) and essential thrombocythemia (ET).¹

Myelofibrosis is a serious and life-threatening bone marrow disorder caused by the accumulation of malignant bone marrow cells that triggers an inflammatory response and scars the bone marrow. The replacement of bone marrow with scar tissue limits its ability to produce red blood cells, prompting the spleen and liver to take over this function. Symptoms that arise from this disease include enlargement of the spleen, anemia, extreme fatigue and pain.

The estimated prevalence of MPNs suggest there are approximately 300,000 people living with the disease in the U.S., of which myelofibrosis accounts for approximately 18,000 patients.² In Europe, there is a wide variation of prevalence observed across data sources. Myelofibrosis has a median age of 64 at the time of diagnosis³ and is a progressive disease with approximately 20 percent of patients eventually developing acute myeloid leukemia (AML).⁴ The median survival for high-risk myelofibrosis patients is less than 1.5 years, while the median survival for patients with myelofibrosis overall is approximately 6 years.⁴

About CTI BioPharma Corp.

CTI BioPharma Corp. is a biopharmaceutical company focused on the acquisition, development and commercialization of novel targeted therapies covering a spectrum of blood-related cancers that offer a unique benefit to patients and healthcare providers. CTI BioPharma has a late-stage development pipeline, including pacritinib for the treatment of patients with myelofibrosis. CTI BioPharma is headquartered in Seattle, Washington. For additional information and to sign up for email alerts and get RSS feeds, please visit www.ctibiopharma.com.

Forward-Looking Statements

This press release includes forward-looking statements, which are within the meaning of the Safe Harbor provisions of the Private Securities Litigation Reform Act of 1995, including statements regarding expectations with respect to the potential therapeutic utility of pacritinib, including pacritinib’s potential to achieve treatment goals across patients with myelofibrosis, and expectations with respect to our ability to be able to interpret clinical trial data and results despite not satisfying the pre-specified minimum evaluable patient goal for the PERSIST-2 clinical trial and expectations with respect to the potential therapeutic utility of pacritinib. Such statements are subject to a number of risks and uncertainties, the outcome of which could materially and/or adversely affect actual future results and the trading price of the issuers’ securities, including risks related to the satisfaction of regulatory and other requirements; the actions of regulatory bodies and other governmental authorities; other clinical trial results; changes in laws and regulations; product quality, product efficacy, study protocol, data integrity or patient safety issues; product development risks; and other risks identified in each of the issuer’s most recent filings on Forms 10-K and 10-Q and other Securities and Exchange Commission filings.

1. MPN Research Foundation. Accessed June 2017. Available at www.mpnresearchfoundation.org.
2. Based on Mesa R, ASH 2012 poster.
3. Cervantes F, et al., New prognostic scoring system for primary myelofibrosis based on a study of the International Working Group for Myelofibrosis Research and Treatment. Blood. 2009; 113:2895-2901.
4. Vannucchi, A. Management of Myelofibrosis. ASH Education Book. 2011; 1:222-230.

CTI BioPharma Contacts:

Ed Bell
+1 206-272-4345
ebell@ctibiopharma.com