title: [Endoscopic radiofrequency ablation for liver metastasis of colorectal cancer].
abstract: The application of radiofrequency ablation (RFA) for liver metastasis of colorectal cancer has not yet acquired an established status in clinical cancer therapy research. Removing as much tumor tissue as possible is desirable, but some cases do not allow optimal surgical ablation due to general condition of the patient and tumor status. We introduced endoscopic RFA for liver cancer in 2003, and have applied the procedure to 6 cases with H1 or H2 liver metastases of colorectal cancer to which surgical ablation could not be applied due to the poor general health of patients. Mean tumor diameter was 22.9 mm, and mean number of tumors per patient was 1.2. Tumor location was: S4, n = 2; S5, n = 1; S4, n = 1; S7, n = 2; and S8, n = 1. Mean frequency of session was 3.0. No complications occurred in any cases, and no reoperations were required. Although no recurrence of tumors in the vicinity of ablation was observed, 2 cases of each lung metastasis and intrahepatic recurrence were identified. Intrahepatic recurrence underwent hepatic arterial infusion (HAI) chemotherapy for simultaneous metastatic hepatic tumors (H2) prior to RFA, and relapses occurred in the metastatic focus where the efficacy of HAI was observed. At this point, 2 deaths were reported, 1 each from cancer and other diseases, and mean duration of survival after the procedure was 451.2 days. These results indicate that endoscopic RFA with good local control should be an available treatment for cases involving colorectal cancer with metastasis to the liver in which surgical ablation is difficult to apply.
authors.affiliation: First Dept. of Surgery, Iwate University School of Medicine.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takahashi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nitta
authors.forename: Akira
authors.initials: A
authors.lastname: Sasaki
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Fujita
authors.forename: Toru
authors.initials: T
authors.lastname: Obuchi
authors.forename: Koichi
authors.initials: K
authors.lastname: Hoshikawa
authors.forename: Koki
authors.initials: K
authors.lastname: Otsuka
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Kawamura
authors.forename: Taro
authors.initials: T
authors.lastname: Higuchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Asahi
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Saito
mesh_terms: D000328:Adult; D000368:Aged; D017115:Catheter Ablation / Q000379:methods*; D015179:Colorectal Neoplasms / Q000473:pathology*; D016145:Endoscopy, Digestive System; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000556:secondary* / Q000601:surgery*; D008297:Male; D016896:Treatment Outcome