Tm Bioscience Corporation Working To Complete Financing

TORONTO, Nov. 24 /PRNewswire-FirstCall/ - Tm Bioscience Corporation , announced today that the press release issued November 23, 2006 relating to the contemplated financing with Laurus Master Fund, Ltd. was issued in error by Canada News Wire and should therefore be disregarded. Tm Bioscience is working towards completing a financing similar to the one announced in the November 23, 2006 press release, however no assurance can be given that such a financing will be completed on the terms specified in the November 23, 2006 press release, if at all.

About Tm Bioscience - Putting the Human Genome to Work(TM)

Tm Bioscience is a Toronto-based diagnostics company developing a suite of DNA-based tests for genetic disorders, drug metabolism (pharmacogenetics) and infectious diseases.

Tm Bioscience has developed and commercialized Analyte Specific Reagents(x) and a series of Tag-It(TM)(xx) tests for a variety of genetic disorders. These tests are based on Tm Bioscience’s proprietary Tag-It(TM) Universal Array platform, which utilizes a proprietary universal tag system that allows for easy optimization, product development and expansion.

Tm Bioscience’s Cystic Fibrosis (CF) test is the first multiplexed human disease genotyping test to be cleared by the FDA as an in vitro device (IVD) for diagnostic use in the U.S. It has also received CE mark certification and Health Canada clearance, allowing the test to be marketed for diagnostic purposes in the European Union and Canada. In addition, the Company is developing a companion test for the blood-thinning drug warfarin and a test for patients under treatment for sepsis.

For more information, visit http://www.tmbioscience.com. (x) Analyte Specific Reagent. Analytical and performance characteristics are not established. (xx) For Investigational Use Only. The performance characteristics of these products have not been established. Forward-Looking Statements

This press release contains information that is forward-looking information within the meaning of applicable securities laws. In some cases, forward-looking information can be identified by the use of terms such as “may”, “will”, “should”, “expect”, “plan”, “anticipate”, “believe”, “intend”, “estimate”, “predict”, “potential”, “continue” or the negative of theses terms or other similar expressions concerning matters that are not historical facts. In particular, statements about the timing of the anticipated launch of ID-Tag(TM) RVP, its expected role as a cornerstone diagnostic product and as a tool to manage pandemic threats and the expected regulatory status for ID-Tag(TM) RVP in the United States and Canada, are or involve forward-looking information.

Forward-looking information is based on certain factors and assumptions. In particular, in making the statements in this press release, the Company has assumed that the ID-Tag(TM) RVP will receive U.S. FDA approval in 2006 or early 2007, that the Company will be able to develop and manufacture sufficient quantities of its ID-Tag(TM) RVP and that market penetration of ID-Tag(TM) RVP will be such that it will serve a key role in the management and treatment of patients infected by respiratory viruses. While the Company considers these assumptions to be reasonable based on information currently available to it, they may prove to be incorrect.

Forward-looking information, by its nature necessarily involves risks and uncertainties including, without limitation, the difficulty of predicting regulatory approvals, the timing and conditions precedent to obtaining any regulatory approval, market acceptance and demand for new products, the availability of appropriate genetic content and other materials required for the Company’s products, the Company’s ability to manufacture its products on a large scale, the protection of intellectual property connected with genetic content, the impact of competitive products, currency fluctuations, risks associated with the Company’s manufacturing facility and any other similar or related risks and uncertainties. Additional risks and uncertainties affecting the Company can be found in the Company’s 2005 Annual Report, available on SEDAR at www.sedar.com. If any of these risks or uncertainties were to materialize, or if the factors and assumptions underlying the forward-looking information were to prove incorrect, actual results could vary materially from those that are expressed or implied by the forward-looking information contained herein. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Tm Bioscience

CONTACT: INVESTOR RELATIONS CONTACT: James Smith, The Equicom Group, Tel.:(416) 815-0700, Email: jsmith@equicomgroup.com; PR CONTACT: Karl Schmieder,GCI Group, (212) 537-8047, kschmieder@gcigroup.com