MATEON ANNOUNCES INITIATION OF PHASE 1B CLINICAL TRIAL ON OT-101/IL-2 COMBINATION THERAPY FOR SOLID TUMORS

AGOURA HILLS, California, March 15, 2021 (GLOBE NEWSWIRE) -- Mateon Therapeutics Inc. (OTCQB: MATN) today announced the regulatory approval from the Ministry of Food and Drug Safety of Korea for the phase 1b clinical trial of a patented OT-101/IL-2 combination. This phase 1b clinical trial will confirm the safety and effectiveness of OT-101/IL-2 in solid cancer patients in cooperation with the UK global pharmaceutical company Clinigen Group. The study will be conducted together with Autotelic BIO- a partner of Mateon on OT-101/IL-2 combination.

OT-101 has received orphan drug designation for glioblastoma, melanoma, and pancreatic cancer. Furthermore, FDA recently granted Rare Pediatric Designation for OT-101 against diffuse intrinsic pontine glioma (DIPG). OT-101 is also effective against coronavirus including COVID-19 and being deployed against the COVID-19 epidemic.

OT-101 has demonstrated robust efficacy against pancreatic cancer, glioblastoma, and melanoma during phase 2 clinical trials. The demonstration that OT-101 will synergize with IL-2 further demonstrate its utility as adjunct to other immunotherapies. Interleukin-2 (IL-2, Aldesleukin, PROLEUKIN®) Immunotherapy is cancer treatment that stimulates the body's immune system to fight cancer, such as melanoma.

About Mateon Therapeutics

Mateon was created by the recent reverse merger with Oncotelic which became a wholly owned subsidiary of Mateon Therapeutics Inc. creating an immuno-oncology company dedicated to the development of first in class RNA therapeutics as well as small molecule drugs against cancer. OT-101, the lead immune-oncology drug candidate of Mateon/Oncotelic, is a first-in-class RNA therapeutic targeting TGF beta that exhibited single agent activity in some relapsed/refractory cancer patients in clinical trial settings. The founding team members of Oncotelic were responsible for the development of Abraxane as chemotherapeutic agents for breast, lung, melanoma, and pancreatic cancer. Abraxane was approved in 2005 and has more than $1B in sales annually. The same founding team was responsible for the development of Cynviloq, a next generation Abraxane, which was acquired by NantPharma for $1.3B. Mateon/Oncotelic will leverage its deep expertise in oncology and RNA therapeutic drug development to improve treatment outcomes and survival of cancer patients. For more information, please visit www.oncotelic.com and www.mateon.com.

About OT-101

OT-101 is an antisense against the host TGF-β protein required for viral replication and its overexpression likely to cause the wide range of clinical symptoms associated with COVID-19 including Kawasaki syndrome (Fatih M. Uckun, Vuong Trieu. Targeting Transforming Growth Factor-beta for Treatment of COVID-19-associated Kawasaki Disease in Children. Clin Res Pediatr 2020; 3(1): 1-3) and acute respiratory distress syndrome (ARDS) (Fatih M. Uckun, Larn Hwang, Vuong Trieu. Selectively targeting TGF-β with Trabedersen/OT-101 in treatment of evolving and mild ARDS in COVID-19. Clin. Invest. (Lond.) 2020; 10(2), 167-176. DOI: 10.4172/ Clinical-Investigation.1000166.).

TGF-β is elevated in COVID-19 (Xiong Y. et al. Transcriptomic characteristics of bronchoalveolar lavage fluid and peripheral blood mononuclear cells in COVID-19 patients. Emerging Microbes & infections 2020; 9:1, 761-770, DOI: 10.1080/22221751.2020.1747363. Agrati C. et al. Expansion of myeloid-derived suppressor cells in patients with severe coronavirus disease (COVID-19). Cell Death & Differentiation 2020; https://doi.org/10.1038/s41418-020-0572-6.).

About Mateon Therapeutics

Mateon was created by the 2019 merger with Oncotelic, which became a wholly owned subsidiary of Mateon, thereby creating an immuno-oncology company dedicated to the development of first in class RNA therapeutics as well as small molecule drugs against cancer and infectious diseases. OT-101, the lead immuno-oncology drug candidate of Mateon/Oncotelic, is a first-in-class anti-TGF-βRNA therapeutic that exhibited single agent activity in some relapsed/refractory cancer patients in clinical trial settings. OT-101 also has activity against SARS-CoV-2. Mateon/Oncotelic is seeking to leverage its deep expertise in oncology drug development to improve treatment outcomes and survival of cancer patients with a special emphasis on rare paediatric cancers. Mateon has rare paediatric designation for DIPG (OT-101), melanoma (CA4P), and AML (OXi4503). For more information, please visit www.oncotelic.com and www.mateon.com.

Mateon's Cautionary Note on Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, included in this communication regarding strategy, future operations, future financial position, prospects, plans and objectives of management are forward-looking statements. Words such as “may”, “expect”, “anticipate” “hope”, “vision”, “optimism”, “design”, “exciting”, “promising”, “will”, “conviction”, "estimate," "intend," "believe", “quest for a cure of cancer”, “innovation-driven”, “paradigm-shift”, “high scientific merit”, “impact potential” and similar expressions are intended to identify forward-looking statements. Forward-looking statements contained in this press release include, but are not limited to, statements about future plans, the progress, timing, clinical development, scope and success of future clinical trials, the reporting of clinical data for the company’s product candidates and the potential use of the company’s product candidates to treat various cancer indications. Each of these forward-looking statements involves risks and uncertainties and actual results may differ materially from these forward-looking statements. Many factors may cause differences between current expectations and actual results, including unexpected safety or efficacy data observed during preclinical or clinical studies, clinical trial site activation or enrollment rates that are lower than expected, changes in expected or existing competition, changes in the regulatory environment, failure of collaborators to support or advance collaborations or product candidates and unexpected litigation or other disputes. These risks are not exhaustive, the company faces known and unknown risks, including the risk factors described in the company’s annual report on Form 10-K filed with the SEC on April 10, 2019 and in the company’s other periodic filings. Forward-looking statements are based on expectations and assumptions as of the date of this press release. Except as required by law, the company does not assume any obligation to update forward-looking statements contained herein to reflect any change in expectations, whether as a result of new information future events, or otherwise.

Contact Information:For Mateon Therapeutics, Inc.:Amit Shah[email protected]

Source: Mateon Therapeutics, Inc.

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