Bioenvision to Hold Fiscal 2005 Third Quarter Financial Results Conference Call Monday, May 16, 2005.

NEW YORK, N.Y. -- Bioenvision (NASDAQ:BIVN) will release fiscal 2005 third quarter financial results before the market opens on Monday, May 16, 2005.

Christopher Wood, M.D., CEO of Bioenvision, and David P. Luci, chief financial officer, will host an investment conference call beginning at 10:30 a.m. Eastern Daylight Time on Monday, May 16, 2005 to discuss these results and to answer questions.

To participate in the live call by telephone, please dial [phone] from the U.S. and Canada or [phone] from outside the U.S. A telephone replay of the call will be available beginning at 1:30 p.m. EDT May 16 until 11:59 p.m. EDT May 20 by dialing [phone] or [phone] and entering reservation number 6076606.

Those interested in listening to the conference call live via the Internet may do so by visiting Bioenvision's Web site at www.bioenvision.com. To listen to the live call, please go to the Web site 15 minutes prior to its start to register, download, and install the necessary audio software. A replay will be available on the Web site for 14 days.

About Bioenvision

Bioenvision's primary focus is the acquisition, development and distribution of compounds and technologies for the treatment of cancer. Bioenvision has a broad pipeline of products for the treatment of cancer, including: Clofarabine (in co-development with Genzyme Corporation), Modrenal(R) (for which Bioenvision has obtained regulatory approval for marketing in the United Kingdom for the treatment of post-menopausal breast cancer following relapse to initial hormone therapy), and other products in clinical trials. Bioenvision is also developing anti-infective technologies, including the OLIGON technology; an advanced biomaterial that has been incorporated into various FDA-approved medical devices. For more information on Bioenvision please visit our Web site at www.bioenvision.com.

Certain statements contained herein are "forward-looking" statements (as such term is defined in the Private Securities Litigation Reform Act of 1995). Because these statements include risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Specifically, factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements include, but are not limited to: risks associated with preclinical and clinical developments in the biopharmaceutical industry in general and in Bioenvision's compounds under development in particular; the potential failure of Bioenvision's compounds under development to prove safe and effective for treatment of disease; uncertainties inherent in the early stage of Bioenvision's compounds under development; failure to successfully implement or complete clinical trials; failure to receive marketing clearance from regulatory agencies for our compounds under development; acquisitions, divestitures, mergers, licenses or strategic initiatives that change Bioenvision's business, structure or projections; the development of competing products; uncertainties related to Bioenvision's dependence on third parties and partners; and those risks described in Bioenvision's filings with the SEC. Bioenvision disclaims any obligation to update these forward-looking statements.