title: Intraperitoneal photodynamic therapy of the rat CC531 adenocarcinoma.
abstract: The goal of this study was to investigate the efficacy of photodynamic therapy (PDT) of a single tumour growing intraperitoneally. For this purpose the CC531 colon carcinoma, implanted in an intraperitoneal fat pad of Wag/RijA rats, was treated with intraperitoneal photodynamic therapy (IPPDT) using Photofrin as the photosensitiser. Two illumination techniques have been compared. An invasive illumination technique using Perspex blocks to illuminate 30 cm2 of the lower abdomen gave a significant delay in tumour growth with 25 J cm-2 applied 1 day after Photofrin. A minimally invasive illumination technique using a balloon catheter to illuminate 14 cm2 resulted in an equivalent growth delay with 75 J cm-2. The route of administration of the photosensitiser did not influence regrowth times of the tumour. Mitomycin C (MMC), a bioreductive agent, was used to exploit the known PDT-induced hypoxia. The combination of IPPDT with MMC resulted in an increased tumoricidal effect. In conclusion, IPPDT led to a significant growth delay for a single tumour implanted intraperitoneally and repetition of the PDT treatment was possible using a minimally invasive illumination technique. Repeated treatments resulted in increased tumour response.
authors.affiliation: Division of Experimental Therapy, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
authors.forename: R B
authors.initials: RB
authors.lastname: Veenhuizen
authors.forename: J P
authors.initials: JP
authors.lastname: Marijnissen
authors.forename: P
authors.initials: P
authors.lastname: Kenemans
authors.forename: M C
authors.initials: MC
authors.lastname: Ruevekamp-Helmers
authors.forename: L W
authors.initials: LW
authors.lastname: 't Mannetje
authors.forename: T J
authors.initials: TJ
authors.lastname: Helmerhorst
authors.forename: F A
authors.initials: FA
authors.lastname: Stewart
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy* / Q000473:pathology; D000273:Adipose Tissue; D000818:Animals; D002455:Cell Division / Q000187:drug effects / Q000528:radiation effects; D003110:Colonic Neoplasms / Q000188:drug therapy* / Q000473:pathology; D017323:Dihematoporphyrin Ether / Q000008:administration & dosage / Q000627:therapeutic use*; D005260:Female; D007274:Injections, Intraperitoneal; D007275:Injections, Intravenous; D008027:Light; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
chemical_list: D017319:Photosensitizing Agents; D017323:Dihematoporphyrin Ether