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[Prostate cancer].

P Bey1, V Beckendorf, J Stinès

  • 1Centre Alexis-Vautrin, centre régional de lutte contre le cancer, avenue de Bourgogne, Brabois, 54511 Vandaeuvre-lès-Nancy, France.

Cancer Radiotherapie : Journal De La Societe Francaise De Radiotherapie Oncologique
|November 22, 2001
PubMed
Summary
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Curative radiation therapy for prostate cancer requires high doses to the entire prostate, potentially including seminal vesicles and lymph nodes based on cancer stage and characteristics. Accurate clinical target volume definition, considering prostate anatomy and imaging, is crucial for effective treatment while minimizing dose to surrounding organs.

Area of Science:

  • Oncology
  • Radiotherapy
  • Urology

Context:

  • Prostate cancer treatment often involves curative-intent radiation therapy, necessitating high doses (≥66 Gy) to the prostate.
  • Clinical target volume (CTV) expansion may include seminal vesicles and pelvic lymph nodes, guided by prognostic factors like clinical stage, PSA level, and Gleason's score.
  • Understanding prostate zonal anatomy is key, as transitional zone cancers may remain localized despite high volume and PSA levels, contrasting with peripheral zone tumors prone to extracapsular extension.

Purpose:

  • To outline the principles of defining the clinical target volume (CTV) for curative-intent prostate cancer radiation therapy.
  • To highlight the role of imaging modalities such as CT-scan and Nuclear Magnetic Resonance (NMR) in delineating the prostate, seminal vesicles, and potentially the prostate apex.
  • To emphasize the importance of incorporating margins around the CTV to account for daily variations in patient setup and organ motion, while respecting dose constraints for organs at risk.

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Summary:

  • Radiation therapy for prostate cancer aims for cure by delivering high doses to the prostate gland.
  • The clinical target volume (CTV) is defined based on cancer staging, PSA, Gleason score, and may extend to include seminal vesicles and lymph nodes.
  • Accurate imaging (CT, NMR) and consideration of anatomical variations and motion are essential for precise CTV delineation and safe treatment delivery.

Impact:

  • Optimized CTV definition improves radiation therapy efficacy for prostate cancer.
  • Precise targeting reduces radiation exposure to surrounding healthy tissues, minimizing side effects.
  • Enhanced understanding of prostate anatomy and tumor behavior aids in tailoring radiation treatment plans for better patient outcomes.