title: Cutaneous and intra-abdominal abscess formation in rats following radio frequency [corrected] ablation of liver tumors in combination with celecoxib treatment.
abstract: BACKGROUND
  The present study evaluated the safety of treatment of colorectal liver metastases with radio frequency ablation (RFA) in combination with high doses of the selective cyclooxygenase-2 inhibitor celecoxib.
  
  
  METHODS
  The study was performed in the CC531 rat model for colorectal cancer. The rats were inoculated with CC531 tumor cells subcapsularly in the liver. They were then randomized for treatment with celecoxib, RFA, or their combination. Celecoxib treatment was started at tumor induction. Three weeks later the liver tumors were treated with RFA and the effects on the health of the rats were monitored.
  
  
  RESULTS
  Treatment that included RFA resulted in significantly (p=0.003) more deaths than sham-operated rats. Including celecoxib in the treatment resulted in significantly increased cutaneous wound abscess formation after surgery (p<0.0001). In addition, the combination of celecoxib treatment with RFA resulted in intra-abdominal abscess formation (p<0.0001).
  
  
  CONCLUSIONS
  The results indicated that the combination of high-dose celecoxib and RFA for treating liver metastases should be used with caution when applied as an anticancer treatment modality since additional side-effects are induced.
authors.affiliation: Departments of Surgery, Leiden University Medical Center, 2300 RC Leiden, The Netherlands.
authors.forename: Pieter
authors.initials: P
authors.lastname: De Heer
authors.forename: Maro H
authors.initials: MH
authors.lastname: Sandel
authors.forename: Frank M
authors.initials: FM
authors.lastname: Speetjens
authors.forename: Margareta M
authors.initials: MM
authors.lastname: Koudijs
authors.forename: Hein
authors.initials: H
authors.lastname: Putter
authors.forename: Geeske N
authors.initials: GN
authors.lastname: Ensink
authors.forename: Cornelis J H
authors.initials: CJ
authors.lastname: Van de Velde
authors.forename: Peter J K
authors.initials: PJ
authors.lastname: Kuppen
mesh_terms: D018784:Abdominal Abscess / Q000209:etiology* / Q000473:pathology; D000818:Animals; D000068579:Celecoxib; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000473:pathology; D003131:Combined Modality Therapy; D052246:Cyclooxygenase 2 Inhibitors / Q000008:administration & dosage / Q000009:adverse effects*; D004353:Drug Evaluation, Preclinical; D008113:Liver Neoplasms / Q000188:drug therapy* / Q000532:radiotherapy* / Q000556:secondary; D009368:Neoplasm Transplantation; D011720:Pyrazoles / Q000008:administration & dosage / Q000009:adverse effects*; D011878:Radiotherapy / Q000009:adverse effects*; D011897:Random Allocation; D051381:Rats; D011919:Rats, Inbred Strains; D012871:Skin Diseases / Q000209:etiology*; D013449:Sulfonamides / Q000008:administration & dosage / Q000009:adverse effects*; D013997:Time Factors
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D011720:Pyrazoles; D013449:Sulfonamides; D000068579:Celecoxib