Gene therapy was originally thought to cover replacement of malfunctioning\ngenes in treatment of various diseases. Today, the field has been expanded to application\nof viral and non-viral vectors for delivery of recombinant proteins for the compensation of\nmissing or insufficient proteins, anti-cancer genes and proteins for destruction of tumor cells,\nimmunostimulatory genes and proteins for stimulation of the host defense system against\nviral agents and tumors. Recently, the importance of RNA interference and its application in\ngene therapy has become an attractive alternative for drug development.
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