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2013 ; 22
(1
): 22-35
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Intraoperative radiotherapy in colorectal cancer: systematic review and
meta-analysis of techniques, long-term outcomes, and complications
#MMPMID23270946
Mirnezami R
; Chang GJ
; Das P
; Chandrakumaran K
; Tekkis P
; Darzi A
; Mirnezami AH
Surg Oncol
2013[Mar]; 22
(1
): 22-35
PMID23270946
show ga
BACKGROUND: The precise contribution of IORT to the management of locally
advanced and recurrent colorectal cancer (CRC) remains uncertain. We performed a
systematic review and meta-analysis to assess the value of IORT in this setting.
METHODS: Studies published between 1965 and 2011 that reported outcomes after
IORT for advanced or recurrent CRC were identified by an electronic literature
search. Studies were assessed for methodological quality and design, and
evaluated for technique of IORT delivery, oncological outcomes, and complications
following IORT. Outcomes were analysed with fixed-effect and random-effect model
meta-analyses and heterogeneity and publication bias examined. RESULTS: 29
studies comprising 14 prospective and 15 retrospective studies met the inclusion
criteria and were assessed, yielding a total of 3003 patients. The indication for
IORT was locally advanced disease in 1792 patients and locally recurrent disease
in 1211 patients. Despite heterogeneity in methodology and reporting practice,
IORT is principally applied for the treatment of close or positive margins. When
comparative studies were evaluated, a significant effect favouring improved local
control (OR 0.22; 95% CI = 0.05-0.86; p = 0.03), disease free survival (HR 0.51;
95% CI = 0.31-0.85; p = 0.009), and overall survival (HR 0.33; 95% CI = 0.2-0.54;
p = 0.001) was noted with no increase in total (OR 1.13; 95% CI = 0.77-1.65;
p = 0.57), urologic (OR 1.35; 95% CI = 0.84-2.82; p = 0.47), or anastomotic
complications (OR 0.94; 95% CI = 0.42-2.1; p = 0.98). Increased wound
complications were noted after IORT (OR 1.86; 95% CI = 1.03-3.38; p = 0.049).
CONCLUSIONS: Despite methodological weaknesses in the studies evaluated, our
results suggest that IORT may improve oncological outcomes in advanced and
recurrent CRC.