Down-staging following neoadjuvant chemo-radiotherapy for locally advanced rectal cancer: does timing of surgery really matter?

Bhawna Sirohi, Savio Barreto, Shraddha Patkar, Alok Gupta, Ashwin DeSouza, Sanjay Talole, Kedar Deodhar, Nitin Shetty, Reena Engineer, Mahesh Goel, Shailesh V Shrikhande

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Abstract

Background: Neoadjuvant chemoradiotherapy (NACTRT) improves local recurrence rate in locally advanced (LA) rectal cancer with no survival benefit. Pathological complete response (pCR) post-NACTRT is associated with improved outcome. Debate is ongoing as to when would be the opportune time to operate. Aim: To determine if greater down-staging can be achieved by a longer time interval from NACTRT to surgery (tumor regression score [TRS]) and whether this would impact sphincter saving surgery rates and early relapse rates. Materials and Methods: A retrospective analysis of a prospectively maintained database of patients with LA rectal adenocarcinoma treated from January 2012 to August 2013 was carried out. One hundred and ten patients who completed NACTRT (50 Gy/25 fractions with capecitabine 825 mg/m 2 twice daily) followed by surgical resection were included. For response evaluation patients were divided into two groups, Group 1 (TRS ≤60 days, n = 42) and 2 (TRS >60 days, n = 68). Tumor down-staging, pCR rate, tumor regression grade (TRG) post-NACTRT and relapse rates were correlated with TRS. Results: Of 110 patients (median age: 49 years (21-73), 71% males; 18 (16.5%) with signet ring histology) 96% patients underwent an R0 resection. Post-NACTRT, CR was attained in 5 (4.5%), partial response in 98 (89%) and stable disease in 7 (6.4%) patients. Median time from completion of NACTRT to surgery was 64.5 days (6-474). Median lymph nodes harvested were 10 (1-50). Overall, 22 (20%) patients achieved pCR. 26 (62%) patients in Group 1 compared to 36 (53%) in Group 2 underwent sphincter sparing surgery (SSS) (P = 0.357). Six patients (14%) in Group 1 and 16 (24%) in Group 2 achieved pCR (P = 0.24). Median TRG in both groups was three. Conclusion: Timing of surgery following NACTRT for LA rectal cancer does not influence pathological response, ability to perform SSS or disease-free survival. There is no incremental benefit of delaying the surgery though this needs to be confirmed in a prospective randomized trial.

Original languageEnglish
Pages (from-to)263-266
Number of pages4
JournalIndian Journal of Medical and Paediatric Oncology
Volume35
Issue number4
DOIs
Publication statusPublished - Oct 2014
Externally publishedYes

Bibliographical note

This article is available under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike License (CC BY-NC-SA), which permits non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

Keywords

  • Adverse events
  • Neoadjuvant therapy
  • rectal cancer
  • surgery

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    Sirohi, B., Barreto, S., Patkar, S., Gupta, A., DeSouza, A., Talole, S., Deodhar, K., Shetty, N., Engineer, R., Goel, M., & Shrikhande, S. V. (2014). Down-staging following neoadjuvant chemo-radiotherapy for locally advanced rectal cancer: does timing of surgery really matter? Indian Journal of Medical and Paediatric Oncology, 35(4), 263-266. https://doi.org/10.4103/0971-5851.144986