Table 4.

Targeting ligands in PDT

Class	Ligand	Target	PS	Application	Reference
Monoclonal antibody	OC125	Ovarian cancer	Chlorin(e6)	Cancer, in vitro, in vivo	[157]
Peptide	Octreotide	Somatostatin receptor	Chlorin(e6)	Leukaemia, in vitro	[81]
Peptide	RGD tripeptide	αvβ3 integrin	Phaeophorbide a	Cancer, in vitro	[76]
Lipoprotein	Low-density lipoprotein	LDL receptor	Tetra-t-butyl silicon phthalocyanine	Cancer, atherosclerosis, in vitro, in vivo	[158]
Serum protein	Transferrin	Transferrin receptor	Hematoporphyrin	Cancer, in vitro	[77]
Serum protein	Modified albumin	Scavenger receptor	Chlorin(e6)	Atherosclerosis, in vitro, in vivo	[159]
Vitamin	Folic acid	Folate receptor	Phaeophorbide a	Cancer, in vitro	[76]
Steroid	Oestradiol	Steroid receptor	Phaeophorbide a	Breast cancer, in vitro	[160]
Carbohydrate	Mannose	Mannose receptor	Meso-tetraphenylporphyrin	Cancer, in vitro	[161]