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MATEON THERAPEUTICS, INC. (OTCMKTS:MATN) Files An 8-K Changes in Registrant’s Certifying Accountant
Item 4.01. Change in Registrant’s Certifying Accountant.

On September 4, 2019 the Company received a letter dated July 29, 2019 from OUM & Co, LLP (“OUM”), the Company’s prior registered independent account firm, addressed to the Securities and Exchange Commission stating that OUM is in agreement with the Company’s disclosure in Item 4.01 of the current report on Form 8-K filed by the Company on July 29, 2019. A copy of OUM’s letter is filed with this report as Exhibit 16.1.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

MATEON THERAPEUTICS INC Exhibit
EX-16.1 2 ex16-1.htm   July 29,…
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About MATEON THERAPEUTICS, INC. (OTCMKTS:MATN)

Mateon Therapeutics, Inc., formerly OXiGENE, Inc., is a biopharmaceutical company. The Company is focused on the development of vascular disrupting agents (VDAs) for the treatment of cancer. The Company is engaged in developing two clinical stage investigational drugs: VDAs-CA4P and OXi4503. Its lead compound is CA4P, which is also known as combretastatin A4-phosphate, fosbretabulin tromethamine, fosbretabulin and ZYBRESTAT. VDAs selectively targets the vasculature of cancer tumors and obstructs a tumor’s blood supply without disrupting the blood supply to normal tissues. VDAs are in a class of drugs called vascular targeted therapies (VTTs), which also includes anti-angiogenic agents (AAs). CA4P is a reversible tubulin binding agent that selectively targets the endothelial cells that make up the blood vessel walls in solid tumors. The Company is pursuing the development of a product candidate, OXi4503, which is a dual-mechanism VDA.