GlycoGenesys updated on GCS-100

In collaboration with Dr. Kenneth Anderson and Dr. Paul Richardson of the Dana- Farber Cancer Institute, the Company designed a Phase I/II trial to study GCS-100 in patients with relapsed or refractory multiple myeloma both alone and in combination with dexamethasone, a standard chemotherapy in multiple myeloma. This is the first clinical trial combining GCS-100 with another therapy. Dexamethasone was chosen because in vitro tests have shown GCS-100 in combination with dexamethasone to have an additive effect allowing for lower dose levels of both GCS-100 and dexamethasone to be used.

The trial was initiated at the Dana-Farber in April 2005 and is enrolling patients. The Company recently initiated a second clinical site, the Lucy Curci Cancer Center in Rancho Mirage, California. It anticipates adding three more sites to expedite patient enrollment of the trial. The Company's clinical trial timeline calls for this trial to be completed in the third quarter of 2006.

Assuming favorable data in the Phase I/II trial, a Phase II study is planned to begin in the third quarter of 2006 and be completed in the first quarter of 2008. This study will be designed to enable the Company to expand to a pivotal trial if supported by an interim review of the data. If needed to demonstrate clinical significance, a Phase III trial is planned for initiation in the third quarter of 2008.