title: Photodynamic therapy of C3H mouse mammary carcinoma with haematoporphyrin di-ethers as sensitizers.
abstract: Haematoporphyrin di-ethers were synthesized and tested as sensitizers for photodynamic therapy of C3H/Tif mammary tumours in mice. Growth curves of the tumours were determined by measuring the tumour volume. The animals were given 25 mg porphyrins kg-1 body weight i.p. and 24 h later exposed to 135 J cm-2 of 630 nm light at a fluence rate of 150 mW cm-2. The sensitizing efficiency of the ethers was measured in terms of the increase in growth time of the treated tumours, as compared with that of untreated controls, needed to reach a volume 5 times larger than that at the time of the treatment. This sensitizing efficiency increased with decreasing polarity, i.e. in the order di-methyl ether, di-propyl ether, dibutyl ether and di-amyl ether. Haematoporphyrin di-amyl ether was more efficient than haematoporphyrin derivative and insignificantly less efficient than photofrin II (DHE). This was true for sensitization of both tumours and normal tissue.
mesh_terms: D000818:Animals; D004987:Ethers / Q000627:therapeutic use; D005260:Female; D017324:Hematoporphyrin Derivative; D006414:Hematoporphyrin Photoradiation; D006415:Hematoporphyrins / Q000627:therapeutic use*; D008325:Mammary Neoplasms, Experimental / Q000188:drug therapy* / Q000473:pathology; D051379:Mice; D008809:Mice, Inbred C3H; D008815:Mice, Inbred Strains; D008938:Mitosis / Q000187:drug effects; D010778:Photochemotherapy; D011838:Radiation-Sensitizing Agents / Q000627:therapeutic use*
chemical_list: D004987:Ethers; D006415:Hematoporphyrins; D011838:Radiation-Sensitizing Agents; D017324:Hematoporphyrin Derivative