In this review, we describe technical advancements of retroviral vectors to address issues of safety, titer, and clinical scale manufacturing to produce high-quality retroviral vector preparations that have made direct intratumoral administration of cytokine encoding recombinant vectors a feasible cancer therapy in the clinic. We also review possible further advances in retroviral vector design, which may prove important in expanding these clinical applications.
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Fong et al. (2000) studied this question.