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<p><b>INTRODUCTION</b>Neoadjuvant chemoradiotherapy (CRT) followed by total mesorectal excision (TME) surgery for locally advanced rectal cancer has been shown to improve local control and reduce toxicity, as compared to adjuvant CRT. We reported the outcomes of our patients with locally advanced rectal cancer treated at National University Hospital, Singapore.</p><p><b>METHODS</b>From April 2002 to December 2014, 117 patients with T3/4, N0/+, M0 rectal cancer received neoadjuvant CRT followed by TME surgery. The treatment regimen comprised a total radiotherapy dose of 50.4 Gy in 28 daily fractions delivered concurrently with 5-fluorouracil or capecitabine chemotherapy over 5.5 weeks. All patients were planned for TME surgery. Local control, disease-free survival, overall survival and treatment toxicities were analysed.</p><p><b>RESULTS</b>Median follow-up was 34 (range 2-122) months. 11.5% (13/113) of patients achieved a pathological complete response (pCR) and 72.6% (85/117) had either tumour or nodal downstaging following neoadjuvant CRT. 5.2% (5/96) of patients had Grade 3 acute toxicities (dermatitis and diarrhoea) and 3.1% (3/96) had Grade 3 late toxicities (fistula and stricture). There was no Grade 4 toxicity noted. The five-year local recurrence, disease-free survival and overall survival rates were 4.5%, 65.7% and 80.6%, respectively. Multivariate analysis showed that nodal positivity was a predictor of poor disease-free survival and poor overall survival. Tumour downstaging and pCR did not improve outcomes.</p><p><b>CONCLUSION</b>Our outcomes were comparable to internationally published data, and this treatment regimen remains the standard of care for locally advanced rectal cancer in our local population.</p>
RESUMO
<p><b>INTRODUCTION</b>This study reports the outcomes of patients with locally advanced rectal cancer treated with neoadjuvant chemoradiation followed by surgery in a local population of Singapore.</p><p><b>MATERIALS AND METHODS</b>The records of 85 patients who underwent neoadjuvant chemoradiation for locally advanced rectal cancer followed by surgery at the Tan Tock Seng Hospital (TTSH) between November 2002 and January 2012 were reviewed. The treatment protocol comprised radiotherapy to a total dose of 50.4 Gy concurrent with 5-fluorouracil-based chemotherapy. Patients underwent total mesorectal excision surgery following the completion of neoadjuvant chemoradiation. Local control, disease-free survival and overall survival were analysed using Kaplan-Meier methods.</p><p><b>RESULTS</b>Median age of the patients was 61 years. All of them completed radiotherapy. One patient did not complete neoadjuvant chemotherapy. The median time to surgery was 52 days. Fifty-five percent (47 of 85) of patients achieved pathological downstaging and 13% (11 of 85) of patients had a pathologic complete response to preoperative treatment. The neoadjuvant chemoradiation was well tolerated. Four percent of patients had grade 3 diarrhoea and 4% of them had grade 3 dermatitis. There were no grade 4 toxicities. With a median follow-up of 41 months, the 5-year actuarial local recurrence, disease-free survival and overall survival rates were 7%, 71.9%, and 83.2% respectively. Univariate analysis showed that patients with positive surgical margins had significantly worse disease-free survival and overall survival (P=0.012 and P<0.001 respectively) and a trend towards a higher rate of local recurrence (P=0.08).</p><p><b>CONCLUSION</b>Our study provides evidence that neoadjuvant chemoradiation is an effective treatment for locally advanced rectal cancer. Our outcomes are comparable with internationally published data and demonstrate the reproducibility of the neoadjuvant approach in an Asian population.</p>