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Because active-targeted liposomes are very complex formulations, quality characteristics of functional lipids have not been defined yet, and this is a major obstacle in clinical application of active targeted liposomes. We have developed high functionality and quality (HFQ) lipids, which define quality characteristics of functional lipids for clinical drug delivery system (DDS) applications. Because HFQ lipids are designed to enable facile and rapid functionalization of DDS carrier by simple and one-step mixing, we are expanding applications for not only liposomes but also exosomes and cells. Recently, we developed multi-color deep imaging by tissue clearing for analysis of spatial distribution of DDS in various tissues. Nanocarriers are usually non-uniformly distributed in solid tumors because of their heterogeneity. Especially, in refractory cancer such as pancreatic cancer, the presence of collagen and blood vessels greatly affects intra-tumor distribution of DDS carrier. Therefore information on spatial relations between the tissue structure and DDS carrier is important to regulate precisely intra-tumor distribution of DDS carrier. Recently, our group has established multi-color deep imaging to analyze spatial distribution of stromal collagen, liposomes, and blood vessels in pancreatic tumor tissue. In this review, we present recent research in developing HFQ lipids. Moreover, current status of research on DDS for pancreatic cancer treatment is reviewed.

Development of Nano-DDS Carriers for Control of Spatial Distribution Using Multi-color Deep Imaging