Shing-Yin (Helen) Tsui, the senior vice president, finance, secretary and principal accounting officer of PhaseRx, Inc. notified the company of her resignation from all positions with the company, effective as of September 15, 2017. Upon effectiveness of Ms. Tsui's resignation, Robert W. Overell, the Company's president and chief executive officer, will replace Ms. Tsui as the secretary of the Company.