A new survival model for hyperthermic intraperitoneal chemotherapy (HIPEC) in tumor-bearing rats in the treatment of peritoneal carcinomatosis.
BACKGROUND
Cytoreduction followed by hyperthermic intraperitoneal chemotherapy (HIPEC) improves survival in patients with peritoneal carcinomatosis of colorectal origin. Animal models are important in the evaluation of new treatment modalities. The purpose of this study was to devise an experimental setting which can be routinely used for the investigation of HIPEC in peritoneal carcinomatosis.


METHODS
A new peritoneal perfusion system in tumor bearing rats were tested. For this purpose CC531 colon carcinoma cells were implanted intraperitoneally in Wag/Rija rats. After 10 days of tumor growth the animals were randomized into three groups of six animals each: group 1: control (n = 6), group 2: HIPEC with mitomycin C in a concentration of 15 mg/m2 (n = 6), group III: mitomycin C i.p. as monotherapy in a concentration of 10 mg/m2 (n = 6). After 10 days, total tumor weight and the extent of tumor spread, as classified by the modified Peritoneal Cancer Index (PCI), were assessed by autopsy of the animals.


RESULTS
No postoperative deaths were observed. Conjunctivitis, lethargy and loss of appetite were the main side effects in the HIPEC group. No severe locoregional or systemic toxity was observed. All control animals developed massive tumor growth. Tumor load was significantly reduced in the treatment group and was lowest in group II.


CONCLUSIONS
The combination of hyperthermia with MMC resulted in an increased tumoricidal effect in the rat model. The presented model provides an opportunity to study the mechanism and effect of hyperthermic intraperitoneal chemotherapy and new drugs for this treatment modality.
Pelz
Joerg O W
JO
Department of Surgery, University of Erlangen-Nuremberg, Germany. joerg.pelz@chir.imed.uni-erlangen.de
Doerfer
Joerg
J
Hohenberger
Werner
W
Meyer
Thomas
T
D000818:Animals; D001835:Body Weight; D045744:Cell Line, Tumor; D003131:Combined Modality Therapy; D004305:Dose-Response Relationship, Drug; D006979:Hyperthermia, Induced / Q000379:methods*; D007263:Infusions, Parenteral; D008113:Liver Neoplasms / Q000209:etiology; D016685:Mitomycin / Q000494:pharmacology; D015233:Models, Statistical; D009362:Neoplasm Metastasis; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000188:drug therapy; D010477:Perfusion; D010534:Peritoneal Neoplasms / Q000188:drug therapy* / Q000628:therapy*; D051381:Rats; D013997:Time Factors; D016896:Treatment Outcome
D016685:Mitomycin