| abstract |
An object of the present invention is to provide a drug carrier comprising mainly polyethylene glycol modified phospholipids and cationic lipids, and containing the polyethylene glycol modified phospholipids in a specific concentration range. The present invention provides a polyethylene glycol modified phospholipid represented by the following formula (I) or a pharmaceutically acceptable salt thereof, and 2-O- (2-diethylaminoethyl) carbamoyl-1,3-O-dioleoylglycerol And a polyethylene glycol modified phospholipid represented by the following formula (I) in a range of 30 wt% to 50 wt%, based on the total weight of lipids in the drug carrier. will be: In said Formula (I), X represents following formula (II) or (III). n represents the integer of 30-150. In said Formula (II), (III), R < 1> represents the C17-22 saturated straight chain fatty acid residue. |