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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
Filed by the Registrant: ☒
Filed by a Party other than the Registrant: ☐

Check the appropriate box:

☐    Preliminary Proxy Statement
☐    Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐    Definitive Proxy Statement
☒    Definitive Additional Materials
☐    Soliciting Material under § 240.14a-12
CTI BioPharma Corp.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of filing fee (Check the appropriate box):
☒    No fee required.
☐    Fee paid previously with preliminary materials.
    Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.





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