Lorus Therapeutics Inc. Announces Patent Allowance for Lead Small Molecule Drugs

TORONTO, ONTARIO--(Marketwire - May 18, 2010) - Lorus Therapeutics Inc. (TSX: LOR)(OTCBB: LRUSF) (“Lorus”), a biopharmaceutical company specializing in the discovery, research and development of pharmaceutical products and technologies for the management of cancer, today announced the allowance of its first patent in China for novel drug candidates from Lorus’ small molecule program.

The Chinese patent covers composition of matter for Lorus’ lead anticancer small molecule LOR-253, as well as composition and uses of Lorus’ lead antimicrobial compound LOR-220. This patent protects antimicrobial compositions based on LOR-220 for inhibiting growth of a variety of different pathogens, including drug-resistant bacteria such as methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE). Lorus has similar patents pending worldwide for LOR-220 and for anticancer uses of LOR-253.

LOR-220 has demonstrated potent activity against a wide range of clinical isolates of drug-resistant bacteria, and is being developed by Lorus as a novel antibacterial compound. LOR-253 is currently in late stage preclinical development. An Investigational New Drug (IND) application for LOR-253 is being finalized for filing with the U.S. FDA for a Phase I dose escalation clinical trial in selected solid tumors.

About LOR-253

LOR-253 is a small molecule compound that has shown selective and potent antitumor activity in a variety of human cancers, including colon cancer and non-small cell lung cancer, and has demonstrated an excellent therapeutic window due to its low toxicity. LOR-253 is a first-in-class inhibitor of the novel cancer target Metal-Responsive Transcription Factor 1 (MTF-1). The mode of action of LOR-253 involves the downregulation of cyclin D1, an important regulator of cell cycle progression and cell proliferation, and decreased expression of genes involved in tumor hypoxia (low oxygen content) and angiogenesis. Increased angiogenesis and alterations in the cyclin D1 regulatory pathway have been linked to the development of cancer.

About LOR-220

LOR-220 is a small molecule developed by Lorus that targets a class of novel bacterial proteins called kinases, which have recently emerged as critical signaling molecules in bacteria. Previous studies performed at Lorus using reference bacterial strains demonstrated activity of LOR-220 against multi-drug resistant Gram-positive bacteria such as methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), and other pathogens that are emerging as a major cause of severe infections in hospitals and communities world wide.

About Lorus

Lorus is a biopharmaceutical company focused on the research and development of novel therapeutics in cancer. Lorus’ goal is to capitalize on its research, preclinical, clinical and regulatory expertise by developing new drug candidates that can be used, either alone, or in combination with other drugs, to successfully manage cancer. The Company also has expertise in antimicrobial drug discovery. Lorus Therapeutics Inc. is listed on the Toronto Stock Exchange under the symbol LOR and on the OTCBB under the symbol LRUSF.

Forward Looking Statements

This press release may contain forward-looking statements within the meaning of Canadian and U.S. securities laws. Such statements include, but are not limited to, statements relating to: our research program plans, our plans to conduct clinical trials, the successful and timely completion of clinical studies and the regulatory approval process, our ability to fund future research, our plans to obtain partners to assist in the further development of our product candidates, the establishment of corporate alliances, the Company’s plans, objectives, expectations and intentions and other statements including words such as “continue”, “believe”, “plan”, “expect”, “intend”, “will”, “should”, “may”, and other similar expressions. Such statements reflect our current views with respect to future events and are subject to risks and uncertainties and are necessarily based upon a number of estimates and assumptions that, while considered reasonable by us are inherently subject to significant business, economic, competitive, political and social uncertainties and contingencies. Many factors could cause our actual results, performance or achievements to be materially different from any future results, performance, or achievements that may be expressed or implied by such forward-looking statements, including, among others: our ability to continue as a going concern, our ability to obtain the capital required for research and operations, the inherent risks in early stage drug development including demonstrating efficacy, development time/cost and the regulatory approval process; our ability to find and enter into agreements with potential partners; our ability to attract and retain key personnel; changing market conditions; and other risks detailed from time-to-time in our ongoing quarterly filings, annual information forms, annual reports and annual filings with Canadian securities regulators and the United States Securities and Exchange Commission.

Should one or more of these risks or uncertainties materialize, or should the assumptions set out in the section entitled “Risk Factors” in our Annual Information Form underlying those forward-looking statements prove incorrect, actual results may vary materially from those described herein. These forward-looking statements are made as of the date of this press release and we do not intend, and do not assume any obligation, to update these forward-looking statements, except as required by law. We cannot assure you that such statements will prove to be accurate as actual results and future events could differ materially from those anticipated in such statements. Investors are cautioned that forward-looking statements are not guarantees of future performance and accordingly investors are cautioned not to put undue reliance on forward-looking statements due to the inherent uncertainty therein.

Lorus Therapeutics Inc.'s recent press releases are available through the Company’s website at www.lorusthera.com. For Lorus’ regulatory filings on SEDAR, please go to www.Sedar.com. For SEDAR filings prior to July 10, 2007 you will find these under the company profile for Global Summit Real Estate Inc. (Old Lorus).