Annals of Surgical Oncology

, Volume 20, Issue 13, pp 4169–4182 | Cite as

Neoadjuvant Radiotherapy for Rectal Cancer: Meta-analysis of Randomized Controlled Trials

  • Nuh N. Rahbari
  • Heike Elbers
  • Vasileios Askoxylakis
  • Edith Motschall
  • Ulrich Bork
  • Markus W. Büchler
  • Jürgen Weitz
  • Moritz Koch
Colorectal Cancer



Although neoadjuvant radiotherapy may improve local control of rectal cancer, its clinical value requires further evaluation as a result of potential side effects and advances in surgical technique. A meta-analysis was performed to assess effectiveness and safety of neoadjuvant radiotherapy in the management of rectal cancer.


The following databases were searched: the Cochrane Library, Biosis, Web of Science, Embase, ASCO Abstracts and WHO International Clinical Trials Registry Platform. Randomized controlled trials on the following comparisons were included: (1) neoadjuvant therapy versus surgery alone and (2) neoadjuvant chemoradiotherapy versus neoadjuvant radiotherapy.


We identified 17 and 5 relevant trials that enrolled 8,568 and 2,393 patients, respectively. Neoadjuvant radiotherapy improved local control (hazard ratio 0.59; 95 % confidence interval 0.48–0.72) compared to surgery alone even after total mesorectal excision, whereas its benefit in overall survival just failed to reach statistical significance (0.93; 0.85–1.00). However, it was associated with increased perioperative mortality (1.48; 1.08–2.03), in particular if a dose of 5 Gy per fraction was administered (1.85; 1.23–2.78). Chemoradiotherapy improved local control as opposed to radiotherapy (0.53; 0.39–0.72), with no impact on perioperative outcome and long-term survival.


Neoadjuvant radiotherapy improves local control in patients with rectal cancer, particularly when chemoradiotherapy is administered. The question if the use of more effective chemotherapy protocols improves overall survival warrants further investigation.

Supplementary material

10434_2013_3198_MOESM1_ESM.pdf (176 kb)
Supplementary material 1 (PDF 176 kb)


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Copyright information

© Society of Surgical Oncology 2013

Authors and Affiliations

  • Nuh N. Rahbari
    • 1
  • Heike Elbers
    • 1
  • Vasileios Askoxylakis
    • 2
  • Edith Motschall
    • 3
  • Ulrich Bork
    • 4
  • Markus W. Büchler
    • 1
  • Jürgen Weitz
    • 4
  • Moritz Koch
    • 4
  1. 1.Department of General, Visceral and Transplantation SurgeryUniversity of HeidelbergHeidelbergGermany
  2. 2.Department of Radiation OncologyUniversity of HeidelbergHeidelbergGermany
  3. 3.Institute of Medical Biometry and Medical InformaticsUniversity of FreiburgFreiburgGermany
  4. 4.Department of Gastrointestinal, Thoracic and Vascular SurgeryUniversity of DresdenDresdenGermany

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