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Howard Hughes Medical Institute [K. P-N., S. L. C. W.] and Department of Cell Biology [S-H. C., B. X., S. L. C. W.], Pathology [K-i. K., M. J. F.], and Neurosurgery [C. C.], Baylor College of Medicine, Houston, Texas 77030
The effectiveness of combination therapy using a suicide gene and cytokine genes for the treatment of metastatic colon carcinoma in the mouse liver was investigated. Pre-established hepatic tumors treated with a recombinant adenoviral vector containing the herpes simplex virus thymidine kinase gene (tk) exhibited substantial regression, although all treated animals suffered from subsequent relapses. Although cotreatment with a mouse interleukin 2 (mIL-2)-containing adenoviral vector induced an effective antitumor immune response, the immunity waned with time, and the treated animals eventually succumbed to hepatic tumor relapse or distant metastases. In this study, mouse granulocyte macrophage colony-stimulating factor (mGM-CSF) gene was tested for its ability to further enhance and prolong the antitumoral cellular immunity. A fraction of the animals treated with tk + mIL-2 + mGM-CSF developed long-term antitumor immunity and survived for more than 4 months without recurrence. This long-term antitumor immunity could be enhanced further by subsequent "vaccination" with mIL-2-expressing parental tumor cells. The results indicate that local expression of GM-CSF in the hepatic tumors and prolonged mIL-2 expression are necessary to generate persistent antitumor immunity that is essential for the prevention of tumor recurrence and long-term animal survival.
1 S. L. C. W. is an investigator of the Howard Hughes Medical Institute.
2 To whom requests for reprints should be addressed, at Department of Cell Biology, Baylor College of Medicine, One Baylor Piaza, Houston, TX 77030.
Received 1/12/96. Accepted 6/18/96.
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