Exhibit 23.3
Consent of L.E.K. Consulting LLC
We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of the summarization of our report to Avant Immunotherapeutics, Inc. (the "Company"), dated June 7, 2002, that is contained on page 6 in the last sentence of Section C.2. of Item 1 of the Annual Report on Form 10-K for the fiscal year ended December 31, 2002 filed by the Company.
| /s/ L.E.K. Consulting LLC | /s/ Michael Clabault C.O.O. for L.E.K. Consulting LLC | |
Boston, Massachusetts October 8, 2003 |
