The invention for tumor targeting delivery of siRNA, siRNA oligomer for inhibiting the expression of particular genes in tumor cells relates to a glycol chitosan nanocomposite and a manufacturing method thereof. siRNA oligomer for tumor targeting the delivery of a siRNA according to the invention - glycol chitosan nanocomposites may have enhanced siRNA transfer function with respect to tumor cells and effectively inhibit the expression of a target gene by an siRNA delivery.
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