Originally published as JCO Early Release 10.1200/JCO.2005.10.206 on December 21 2004

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Phase I Study of Sequential Vaccinations With Fowlpox-CEA(6D)-TRICOM Alone and Sequentially With Vaccinia-CEA(6D)-TRICOM, With and Without Granulocyte-Macrophage Colony-Stimulating Factor, in Patients With Carcinoembryonic Antigen–Expressing Carcinomas

From the Lombardi Cancer Center, Georgetown University Medical Center, Washington DC; Laboratory of Tumor Immunology and Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD; and Therion Biologics Corporation, Cambridge, MA

Address reprint requests to John L. Marshall, MD, Lombardi Cancer Center, Georgetown University Medical Center, 3800 Reservoir Rd, NW, Washington, DC 20007; e-mail: marshalj{at}georgetown.edu

PURPOSE: Our previous clinical experience with vaccinia and replication-defective avipox recombinant carcinoembryonic antigen (CEA) vaccines has demonstrated safety and clinical activity with a correlation between CEA-specific immune response and survival. Preclinical evidence demonstrated that the addition of the transgenes for three T-cell costimulatory molecules (B7-1, ICAM-1, LFA-3, designated TRICOM) results in a significant improvement in antigen-specific T-cell responses and antitumor activity. We describe here the first trial in humans of the CEA-TRICOM vaccines (also including an enhancer agonist epitope within the CEA gene).

PATIENTS AND METHODS: Fifty-eight patients with advanced CEA-expressing cancers were accrued to eight cohorts that involved vaccinations with the following: replication-defective fowlpox recombinant (rF)-CEA(6D)-TRICOM; primary vaccination with recombinant vaccinia (rV)-CEA(6D)-TRICOM plus rF-CEA(6D)-TRICOM booster vaccinations; and rV-CEA(6D)-TRICOM and then rF-CEA(6D)-TRICOM, plus granulocyte-macrophage colony-stimulating factor (GM-CSF) with vaccines, or with divided doses of vaccine with GM-CSF. Vaccines were administered every 28 days for six doses and then once every 3 months. Reverting to treatments every 28 days was allowed if patients progressed on the 3-month schedule.

RESULTS: In this phase I study, no significant toxicity was observed. Twenty-three patients (40%) had stable disease for at least 4 months, with 14 of these patients having prolonged stable disease (> 6 months). Eleven patients had decreasing or stable serum CEA, and one patient had a pathologic complete response. Enhanced CEA-specific T-cell responses were observed in the majority of patients tested.

CONCLUSION: We demonstrated that the CEA-TRICOM vaccines are safe and can generate significant CEA-specific immune responses, and they seem to have clinical benefit in some patients with advanced cancer.

Authors' disclosures of potential conflicts of interest are found at the end of this article.

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