ChemGenex Pharmaceuticals: Announcement Pursuant To Nasdaq Marketplace Rule 4350(b).

MELBOURNE, Australia & MENLO PARK, Calif. -- ChemGenex Pharmaceuticals (ASX: CXS, NASDAQ: CXSP), a pharmaceutical development company dedicated to improving the lives of patients by developing therapeutics in the areas of oncology, diabetes and obesity, today announced that its financial statements for the year ended June 30, 2006, contained in its Annual Report on Form 20-F for the year ended June 30, 2006, as filed with the Securities and Exchange Commission on December 28, 2006, included an audit report containing a going concern qualification from its independent public accounting firm.

This announcement is being made in compliance with Nasdaq Marketplace Rule 4350(b)(i)(B), which requires separate disclosure of receipt of an audit opinion that contains a going concern qualification. This announcement does not represent any change or amendment to the Company's 2006 financial statements or its Annual Report on Form 20-F.

Further information regarding the going concern statement, and Management's position concerning the Company's financial position, can be found in the Company's Annual Report on Form 20-F for the year ended June 30, 2006, as filed with the Securities and Exchange Commission on December 28, 2006.

About ChemGenex Pharmaceuticals Limited (www.chemgenex.com)

ChemGenex Pharmaceuticals is a pharmaceutical development company dedicated to improving the lives of patients by developing therapeutics in the areas of oncology, diabetes, obesity, and depression. ChemGenex harnesses the power of genomics for target discovery and validation, and in clinical trials to develop more individualized therapeutic outcomes. ChemGenex's lead compound, Ceflatonin([R]), is currently in phase 2/3 clinical trials for chronic myeloid leukemia and Quinamed([R]) is in phase 2 clinical development for prostate, breast and ovarian cancers. The company has a significant portfolio of anti-cancer, diabetes, obesity and depression programs, several of which have been partnered with international pharmaceutical companies. ChemGenex currently trades on the Australian Stock Exchange under the symbol "CXS" and on NASDAQ under the symbol "CXSP".

Safe Harbor Statement

Certain statements made herein that use the words "estimate", "project", "intend", "expect", "believe", and similar expressions are intended to identify forward-looking statements within the meaning of the US Private Securities Litigation Reform Act of 1995. These forward-looking statements involve known and unknown risks and uncertainties which could cause the actual results, performance or achievements of the company to be materially different from those which may be expressed or implied by such statements, including, among others, risks or uncertainties associated with the development of the company's technology, the ability to successfully market products in the clinical pipeline, the ability to advance promising therapeutics through clinical trials, the ability to establish our fully integrated technologies, the ability to enter into additional collaborations and strategic alliances and expand current collaborations and obtain milestone payments, the suitability of internally discovered genes for drug development, the ability of the company to meet its financial requirements, the ability of the company to protect its proprietary technology, potential limitations on the company's technology, the market for the company's products, government regulation in Australia and the United States, changes in tax and other laws, changes in competition and the loss of key personnel. These statements are based on our management's current expectations and are subject to a number of uncertainties that could change the results described in the forward-looking statements. Investors should be aware that there are no assurances that results will not differ from those projected.