Cascadian Therapeutics (ONTY) 10-Q 2016 Q2 Quarterly report

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(18 U.S.C. SECTION 1350)

I, Scott D. Myers, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q of Cascadian Therapeutics, Inc. for the quarterly period ended June 30, 2016, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Cascadian Therapeutics, Inc.

August 8, 2016	/s/ Scott D. Myers
	Scott D. Myers
	President and Chief Executive Officer
	(Principal Executive Officer)