International Recommendations on Reirradiation by Intensity Modulated Radiation Therapy for Locally Recurrent Nasopharyngeal Carcinoma

Wai Tong Ng, Yoke Lim Soong, Yong Chan Ahn, Hussain AlHussain, Horace C. W. Choi, June Corry, Vincent Gregoire, Kevin J. Harrington, Chao Su Hu, Kenneth Jensen, Dora L. Kwong, Johannes A. Langendijk, Quynh Thu Le, Nancy Y. Lee, Jin Ching Lin, Tai Xiang Lu, William M. Mendenhall, Brian O'Sullivan, Enis Ozyar, Jian Ji PanLester J. Peters, Sharon S. Poh, David I. Rosenthal, Giuseppe Sanguineti, Yungan Tao, Joseph T. Wee, Sue S. Yom, Melvin L. K. Chua, Anne W. M. Lee*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

Abstract

Purpose: Reirradiation for locally recurrent nasopharyngeal carcinoma (NPC) is challenging because prior radiation dose delivered in the first course is often close to the tolerance limit of surrounding normal structures. A delicate balance between achieving local salvage and minimizing treatment toxicities is needed. However, high-level evidence is lacking because available reports are mostly retrospective studies on small series of patients. Pragmatic consensus guidelines, based on an extensive literature search and the pooling of opinions by leading specialists, will provide a useful reference to assist decision-making for these difficult decisions.

Methods and Materials: A thorough review of available literature on recurrent NPC was conducted. A set of questions and preliminary draft guideline was circulated to a panel of international specialists with extensive experience in this field for voting on controversial areas and comments. A refined second proposal, based on a summary of the initial voting and different opinions expressed, was recirculated to the whole panel for review and reconsideration. The current guideline was based on majority voting after repeated iteration for final agreement.

Results: The initial round of questions showed variations in clinical practice even among the specialists, reflecting the lack of high-quality supporting data and the difficulties in formulating clinical decisions. Through exchange of comments and iterative revisions, recommendations with high-to-moderate agreement were formulated on general treatment strategies and details of reirradiation (including patient selection, targets contouring, dose prescription, and constraints).

Conclusion: This paper provides useful reference on radical salvage treatment strategies for recurrent NPC and optimization of reirradiation through review of published evidence and consensus building. However, the final decision by the attending clinician must include full consideration of an individual patient's condition, understanding of the delicate balance between risk and benefits, and acceptance of risk of complications. (C) 2021 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)682-695
Number of pages14
JournalInternational Journal of Radiation Oncology, Biology, Physics
Volume110
Issue number3
Early online date2-Feb-2021
DOIs
Publication statusE-pub ahead of print - 2-Feb-2021

Keywords

  • SALVAGE ENDOSCOPIC NASOPHARYNGECTOMY
  • STEREOTACTIC BODY RADIOTHERAPY
  • SQUAMOUS-CELL CARCINOMA
  • LONG-TERM OUTCOMES
  • SPINAL-CORD
  • PROGNOSTIC-FACTORS
  • ANTITUMOR-ACTIVITY
  • DISEASE-CONTROL
  • HEAD
  • NECK

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