( Phase I results for CPX-1 presented at ...)Celator Pharmaceuticals Study Shows Anti-Tumor Activity in Cancer,Patients Treated with Therapy Based on Ratiometric Dosing,Health

PRINCETON, N.J., June 04, 2007 /PRNewswire/ -- Celator Pharmaceuticals announced positive safety and efficacy results from its Phase I study of CPX-1 (Irinotecan HCI:Floxuridine), Liposome Injection in patients with heavily pre-treated, advanced solid tumors. Results were presented yesterday in a poster presentation at the American Society of Clinical Oncology (ASCO) meeting in Chicago.

Among a total of 33 patients with different types of cancer who were treated in the dose-escalating study, 73% showed clinical benefit including either partial regression or stable disease. In ten patients delay of disease progression was greater than six months. Among a subset of 15 patients with colorectal cancer, median duration of progression-free survival was 5.3 months. Of these patients, 80% received CPX-1 as a third, fourth or fifth line treatment, and 66% had prior treatment with irinotecan.

"These results provide us with the essential dosing and safety data we need to advance CPX-1 through Phase 2 clinical trials and toward commercialization. Even more importantly, this study also produced very encouraging results related to clinical benefit, which is uncommon in a Phase 1 study," said Andrew Janoff, Ph.D., CEO of Celator.

CPX-1 is a combination therapy including irinotecan HCI and floxuridine, two approved and well known drug agents to treat cancer. The formulation of CPX-1 was developed based on ratiometric dosing using Celator's CombiPlex(TM) technology platform, a proprietary technology that identifies the optimal ratio of drugs to use in combination therapies and then incorporates an advanced nanoparticle delivery system to maintain those optimal ratios when drugs are administered and metabolized in patients. Pending regula
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