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Prostate Cancer
Volume 2012 (2012), Article ID 546794, 7 pages
http://dx.doi.org/10.1155/2012/546794
Clinical Study

Hypofractionated Prostate Radiotherapy with or without Conventionally Fractionated Nodal Irradiation: Clinical Toxicity Observations and Retrospective Daily Dosimetry

1Department of Radiation Oncology, Hazelrig-Salter Radiation Oncology Center, University of Alabama at Birmingham, 1700 6th Avenue South Birmingham, Birmingham, AL 35249, USA
2Birmingham Southern College, 900 Arkadelphia Road, Birmingham, AL 35254, USA

Received 3 March 2012; Accepted 1 May 2012

Academic Editor: Rami Ben-Yosef

Copyright © 2012 Andrew M. McDonald et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. To evaluate toxicity associated with the addition of elective nodal irradiation (ENI) to a hypofractionated regimen for the treatment of prostate cancer. Methods and Materials. Fifty-seven patients received pelvic image-guided IMRT to 50.4 Gy in 28 fractions with a hypofractionated simultaneous boost to the prostate to 70 Gy. Thirty-one patients received prostate-only treatment to 70 Gy in 28 fractions. Results. Median followup was 41.1 months. Early grade ≥2 urinary toxicity rates were 49% (28 of 57) for patients receiving ENI and 58% (18 of 31) for those not ( 𝑃 = 0 . 6 1 ). Early grade ≥2 rectal toxicity rates were 40% (23 of 57) and 23% (7 of 31), respectively ( 𝑃 = 0 . 0 9 ). The addition of ENI resulted in a 21% actuarial rate of late grade ≥2 rectal toxicity at 4 years, compared to 0% for patients treated to the prostate only ( 𝑃 = 0 . 0 2 ). Retrospective daily dosimetry of patients experiencing late rectal toxicity revealed an average increase of 2.67% of the rectal volume receiving 70 Gy compared to the original plan. Conclusions. The addition of ENI resulted in an increased risk of late rectal toxicity. Grade ≥2 late rectal toxicity was associated with worse daily rectal dosimetry compared to the treatment plan.