Provided is a polymeric micelle pharmaceutical preparation that can increase the ratio of contrast at tumor site to background contrast in a short period of time after administration of a lactosome and can suppress the ABC phenomenon so that the lactosome can be administered more than once within a short span. A branched-type amphiphilic block polymer comprising: a multi-branched hydrophilic block comprising sarcosine; and a hydrophobic block comprising polylactic acid. The branched-type amphiphilic block polymer, wherein the number of branches of the hydrophilic block is 3. A molecular assembly comprising the branched-type amphiphilic block polymer. The molecular assembly further comprising a linear type amphiphilic block polymer.
提供的是一种聚合物胶束制药制剂,可以在给予乳状体后的短时间内增加肿瘤部位与背景对比的比例,并且可以抑制ABC现象,使得乳状体可以在短时间内多次给药。包括以下部分的分支型两性块聚合物:包括
硫氨酸的多支链亲
水块;和包括聚
乳酸的疏
水块。该分支型两性块聚合物,其中亲
水块的支链数为3。包括该分支型两性块聚合物的分子组装体。该分子组装体进一步包括线型两性块聚合物。