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Area of Science:

  • Gynecologic Oncology
  • Radiation Oncology
  • Patient-Reported Outcomes

Background:

  • Cervical and endometrial cancers are common gynecologic malignancies.
  • Standard pelvic radiation therapy can cause significant acute gastrointestinal (GI) and urinary toxicity.
  • Intensity-modulated radiation therapy (IMRT) is an advanced radiation technique that may reduce toxicity.

Purpose of the Study:

  • To compare patient-reported acute toxicity and health-related quality of life between standard pelvic radiation and IMRT in women with cervical and endometrial cancer.
  • To evaluate changes in GI and urinary toxicity from baseline to the end of radiation treatment (RT).
  • To assess quality of life using the Trial Outcome Index.

Main Methods:

  • A randomized trial (NRG Oncology/RTOG 1203) comparing standard four-field radiation therapy (RT) with IMRT.
  • Patients were randomly assigned to either standard RT or IMRT.
  • Patient-reported outcomes, including GI and urinary toxicity (using Expanded Prostate Cancer Index Composite - EPIC) and quality of life (Trial Outcome Index), were primary and secondary endpoints.

Main Results:

  • The mean EPIC bowel score declined less in the IMRT group (18.6 points) compared to the standard RT group (23.6 points) (P = .048).
  • The mean EPIC urinary score declined less in the IMRT group (5.6 points) versus the standard RT group (10.4 points) (P = .03).
  • Diarrhea was reported less frequently with IMRT (33.7%) than standard RT (51.9%) (P = .01), with fewer patients on antidiarrheal medication (7.8% vs 20.4%; P = .04).

Conclusions:

  • Pelvic IMRT is associated with significantly less patient-reported GI and urinary toxicity compared to standard RT.
  • IMRT offers an improved toxicity profile from the patient's perspective during treatment for cervical and endometrial cancers.
  • These findings support the use of IMRT to mitigate side effects in gynecologic cancer radiation therapy.