Cell Therapeutics' Highly Selective Oral JAK 2 Inhibitor, Pacritinib, Demonstrates Encouraging Anti-tumor Activity In Patients With Relapsed/Refractory Lymphoma

About FMS- Like Tyrosine Kinase (FLT-3)

Normal expression of FLT3 is restricted to haemopoietic progenitor cells in the bone marrow, thymus and lymph nodes, but is also found on other tissues such as placenta, brain, cerebellum and gonads. Aberrantly expressed FLT3 is observed at high levels in a spectrum of hematologic malignancies including 70% to 100% of AML (Acute Myelogenous Leukemia), B-precursor cell ALL (Acute Lymphoblastic Leukemia), a fraction of T-Cell ALL, and CML (Chronic Myelogenous Leukemia).

About Pacritinib

Pacritinib is an oral, once a day, tyrosine kinase inhibitor (TKI) with dual activity against JAK2 and FLT3. Mutations in these kinases have been shown to be directly related to the development of a variety of blood related cancers including Myeloproliferative disorders ("MPD"), leukemia and lymphoma. Pacritinib has demonstrated encouraging results in phase 1 and 2 studies for patients with myelofibrosis and a phase 3 study is planned in this disease. 

FLT3 is a commonly mutated gene found in acute myeloid leukemia ("AML") patients and its activating mutations have been proven to be a negative prognostic marker for clinical outcome suggesting a possible future role for treatment of AML.

About Lymphoma

Lymphoma is a cancer of the white blood cells, namely lymphocytes, which constitute the lymphatic system. Lymphoma occurs when lymphocytes grow abnormally. The two main types of lymphoma are Hodgkin lymphoma and non- Hodgkin lymphoma. Lymphoma is the most common blood cancer.

About Cell Therapeutics, Inc.

Headquartered in Seattle, CTI is a biopharmaceutical company committed to developing an integrated portfolio of oncology products aimed at making cancer more treatable. For additional information, please visit www.CellTherapeutics.com.

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This press release includes forward-looking statements that involve a number of risks and uncertainties the outcome of which could materially and/or adversely affect actual future results and the market price of CTI's securities. Specifically, the risks and uncertainties that could affect the development of pacritinib include risks associated with preclinical and clinical developments in the biopharmaceutical industry in general, and with pacritinib in particular, including, without limitation, the potential failure of pacritinib to prove safe and effective for the treatment of patients with relapsed/refractory lymphoma or primary MF or MF secondary to other MPNs, either alone or in combination regimens, as determined by the U.S. Food and Drug Administration (the "FDA") and/or the European Medicines Agency (the "EMA"), that pacritinib may not satisfy a medical need not currently addressed with existing non-selective JAK1/JAK2 inhibitors, that the phase III study of pacritinib may not occur as planned, that the projected benefits of the acquisition of pacritinib may not materialize as expected, that CTI may not be able to successfully implement its plans, strategies and objectives related to the acquisition and development of pacritinib, CTI's ability to continue to raise capital as needed to fund its operations, competitive factors, technological developments, costs of developing, producing and selling CTI's product candidates, and the risk factors listed or described from time to time in CTI's filings with the Securities and Exchange Commission including, without limitation, CTI's most recent filings on Forms 10-K, 10-Q and 8-K. Except as may be required by law, CTI does not intend to update or alter its forward-looking statements whether as a result of new information, future events, or otherwise.

Media Contact:

Dan EramianT: 206.272.4343C: 206.854.1200E: [e-mail] www.CellTherapeutics.com/press_room

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