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Press Release

EntreMed Receives New Patent for 2-Methoxyestradiol Analogs

Patent Covers Compositions and Methods

ROCKVILLE, Md., June 11, 2008—EntreMed, Inc.
(Nasdaq: ENMD), a clinical-stage pharmaceutical company developing therapeutics for the treatment of cancer and inflammatory diseases, today announced the issuance of U.S. Patent No. 7,371,741 covering analogs of 2-methoxyestradiol (2ME2). The patent grants EntreMed composition-of-matter and method of use intellectual property protection through 2025 for analogs of 2ME2 in oncology and a broad range of non-oncology indications, including inflammatory and immune disorders, rheumatoid arthritis, and other diseases characterized by abnormal cell division (mitosis).

Analogs of 2ME2 have been developed by EntreMed to improve metabolic stability and retain or enhance antiproliferative and antiangiogenic properties. Preclinical results demonstrate that certain analogs of 2ME2 can attack tumors on multiple fronts—directly by disrupting microtubules, an intracellular matrix necessary for the rapid division of cancer cells, through inhibition of mitosis and induction of apoptosis, and by blocking blood vessels that feed tumors (angiogenesis inhibition).

U.S. Patent No. 7,371,741 entitled “Estradiol derivatives and pharmaceutical compositions using same,” covers analogs that have been modified at certain positions on the 2-methoxyestradiol structure, yet retain their ability to inhibit cell proliferation. In addition, the ‘741 patent claims methods for treating tumors with compounds having the claimed structural modifications of 2-methoxyestradiol. The ‘741 patent covering the issued claims is owned exclusively by EntreMed.

James S. Burns, EntreMed President & Chief Executive Officer, commented, “This patent is the result of an extensive internal program to identify novel compounds based on our expertise in angiogenesis, cell cycle regulation and cell signaling. This patent further strengthens our intellectual property position in next generation antimitotic and antiangiogenic drugs for the treatment of cancer. ENMD-1198, a lead compound resulting from our analog program, is currently in a Phase 1 study in advanced cancers. We anticipate completion of the study in the second half of 2008. Additional studies, including an expanded Phase 1 or Phase 2 trial, are planned for later this year.”

About EntreMed
EntreMed, Inc. is a clinical-stage pharmaceutical company developing therapeutic candidates primarily for the treatment of cancer and inflammation. MKC-1 is currently in multiple Phase 2 clinical trials for cancer. MKC-1 is an oral cell-cycle regulator with activity against the mTOR pathway. ENMD-1198, a novel antimitotic agent, and ENMD-2076, a selective kinase inhibitor, are in Phase 1 studies in advanced cancers. The Company also has an approved IND application for Panzem(R) in rheumatoid arthritis. EntreMed’s goal is to develop and commercialize new compounds based on the Company’s expertise in angiogenesis, cell-cycle regulation and inflammation—processes vital to the treatment of cancer and other diseases, such as rheumatoid arthritis. Additional information about EntreMed is available on the Company’s web site at www.entremed.com and in various filings with the Securities and Exchange Commission.

Forward Looking Statements
This release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act with respect to the outlook for expectations for future financial or business performance (including the timing of royalty revenues and future R&D expenditures), strategies, expectations and goals. Forward-looking statements are subject to numerous assumptions, risks and uncertainties, which change over time. Forward-looking statements speak only as of the date they are made, and no duty to update forward-looking statements is assumed. Actual results could differ materially from those currently anticipated due to a number of factors, including those set forth in Securities and Exchange Commission filings under “Risk Factors,” including risks relating to the need for additional capital and the uncertainty of additional funding; variations in actual sales of Thalomid(R), risks associated with the Company’s product candidates; the early-stage products under development; results in preclinical models are not necessarily indicative of clinical results, uncertainties relating to preclinical and clinical trials; success in the clinical development of any products; dependence on third parties; future capital needs; and risks relating to the commercialization, if any, of the Company’s proposed products (such as marketing, safety, regulatory, patent, product liability, supply, competition and other risks).

COMPANY CONTACT:
CASI Pharmaceuticals, Inc.
Rui Zhang
240-864-2643
ir@casipharmaceuticals.com
INVESTOR CONTACT:
Solebury Trout
Xuan Yang
646-378-2975
xyang@troutgroup.com

About Us

CASI is a U.S. NASDAQ-listed biopharmaceutical company with a platform to develop and accelerate the launch of pharmaceutical products and innovative therapeutics in China, the U.S., and throughout the world. We have offices in Rockville, Maryland, and a wholly owned subsidiary in Beijing, China, through which substantially all of our operations are conducted.

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