For the purpose of the avoidance of reticuloendothelial system (RES)-trapping, liposome entrapped benzoporphyrin derivative monoacid ring A (BPD-MA), which is used for cancer photodynamic therapy (PDT), was modified with polyethylene glycol (PEG-LipBPD-MA). Tumor accumulation of BPD-MA at 3 h after injection with PEG-LipBPD-MA in Meth A-sarcoma-bearing mice was significantly higher than that after injection with non-modified liposomal BPD-MA (Cont-LipBPD-MA) as expected. On the contrary, significant tumor growth suppression after PDT was observed only for Cont-LipBPD-MA but not for PEG-LipBPD-MA. Thus, PEGylation enhances the passive targeting of liposomal BPD-MA in tumor, but decreases the susceptibility of the drug in PDT.
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