Gene therapy with drug resistance genes

Abstract
A major side effect of cancer chemotherapy is myelosuppression. Expression of drug-resistance genes in hematopoietic stem cells (HSC) using gene transfer methodologies holds the promise of overcoming marrow toxicity in cancer chemotherapy. Adequate protection of marrow cells in cancer patients from myelotoxicity in this way would permit the use of escalating doses of chemotherapy for eradicating residual disease. A second use of drug-resistance genes is for coexpression with a therapeutic gene in HSCs to provide a selection advantage to gene-modified cells. In this review, we discuss several drug resistance genes, which are well suited for in vivo selection as well as other newer candidate genes with potential for use in this manner.

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