Intraoperative Electron Radiation Therapy (IOERT) in the Management of Locally Recurrent Rectal Cancer

Overview

Journal BMC Cancer

Publisher Biomed Central

Specialty Oncology

Date 2012 Dec 13

PMID 23231663

Citations 22

Authors

Falk Roeder

Joerg-Michael Goetz

Gregor Habl

Marc Bischof

Robert Krempien

Markus W Buechler

Frank W Hensley

Peter E Huber

Juergen Weitz

Juergen Debus

Affiliations

Soon will be listed here.

Abstract

Background: To evaluate disease control, overall survival and prognostic factors in patients with locally recurrent rectal cancer after IOERT-containing multimodal therapy.

Methods: Between 1991 and 2006, 97 patients with locally recurrent rectal cancer have been treated with surgery and IOERT. IOERT was preceded or followed by external beam radiation therapy (EBRT) in 54 previously untreated patients (median dose 41.4 Gy) usually combined with 5-Fluouracil-based chemotherapy (89%). IOERT was delivered via cylindric cones with doses of 10-20 Gy. Adjuvant CHT was given only in a minority of patients (34%). Median follow-up was 51 months.

Results: Margin status was R0 in 37%, R1 in 33% and R2 in 30% of the patients. Neoadjuvant EBRT resulted in significantly increased rates of free margins (52% vs. 24%). Median overall survival was 39 months. Estimated 5-year rates for central control (inside the IOERT area), local control (inside the pelvis), distant control and overall survival were 54%, 41%, 40% and 30%. Resection margin was the strongest prognostic factor for overall survival (3-year OS of 80% (R0), 37% (R1), 35% (R2)) and LC (3-year LC 82% (R0), 41% (R1), 18% (R2)) in the multivariate model. OS was further significantly affected by clinical stage at first diagnosis and achievement of local control after treatment in the univariate model. Distant failures were found in 46 patients, predominantly in the lung. 90-day postoperative mortality was 3.1%.

Conclusion: Long term OS and LC can be achieved in a substantial proportion of patients with recurrent rectal cancer using a multimodality IOERT-containing approach, especially in case of clear margins. LC and OS remain limited in patients with incomplete resection. Preoperative re-irradiation and adjuvant chemotherapy may be considered to improve outcome.

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