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Intensity-modulated Radiotherapy and Anal Cancer: Clinical Outcome and Late Toxicity Assessment.

I De Francesco1, K Thomas2, L Wedlake2

  • 1Department of Radiology, Oncology and Anatomopathology, Policlinico Umberto I, Rome, Italy; Department of Radiotherapy, The Royal Marsden Hospital, London and Sutton, Sutton, UK.

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Summary
This summary is machine-generated.

Intensity-modulated radiotherapy with chemotherapy for anal cancer shows effects on bowel and sexual function, but these do not worsen over time. This study provides crucial long-term outcome data for patients and future treatment planning.

Keywords:
Anal cancerIMRTradiotherapytoxicity

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Gastroenterology

Background:

  • Anal cancer treatment often involves chemoradiotherapy, with intensity-modulated radiotherapy (IMRT) aiming to reduce acute side effects.
  • Limited data exist on the long-term toxicity profile of IMRT with concomitant chemotherapy for anal cancer.

Purpose of the Study:

  • To assess the potential long-term consequences of intensity-modulated radiotherapy with concomitant chemotherapy in anal cancer patients.
  • To evaluate late-onset bowel and genitalia side effects and their impact on quality of life.

Main Methods:

  • A cohort of 43 anal cancer patients treated with pelvic IMRT and chemotherapy between 2010-2013 was identified.
  • Late toxicity was assessed using validated questionnaires (Pelvic Symptom Questionnaire, Vaizey Incontinence Questionnaire, IBDQ, IBDQ-B) at 1-3.5 years post-treatment.

Main Results:

  • Of 43 patients, 27 (63%) completed follow-up questionnaires.
  • Median scores at >=1 year post-treatment indicated moderate bowel toxicity (IBDQ: 208, IBDQ-B: 38) and incontinence (Vaizey: 3.0).
  • Quality of life/sexual function was affected in 5 patients; no insufficiency fractures or bone marrow issues were reported.

Conclusions:

  • IMRT with chemotherapy for anal cancer appears to have a manageable long-term impact on bowel and sexual function.
  • Toxicity levels did not increase during the observed follow-up period (1-3.5 years).
  • These findings establish a benchmark for future treatment strategies and patient counseling regarding functional outcomes.