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Human Serum Albumin(HSA)is the most abundant protein in human plasma.As a transport protein,HSA has as many as seven drug binding sites and not cause human immunogenicity,and has good biodegradability.Thus HSA has been recognized as the ideal drug carrier[1].Although HSA has been reported to be abundant in inflammatory or tumor tissues due to increased capillary permeability and defective or absent lymphatic drainage systems,HSA itself does not actively target tumor cell properties[2].We use protein engineering technology to generate a recombinant protein of HSA fused with an agent targeting at matriptase,a surface protein over-expressed on cancer cells.The fusion protein possesses not only the drug loading ability of HSA,but also the tumor cell targeting.