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PET and MRI Guided Irradiation of a Glioblastoma Rat Model Using a Micro-irradiator
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Modern techniques for pituitary radiotherapy.

G Minniti1, D C Gilbert, M Brada

  • 1Neuro-oncology Unit, The Institute of Cancer Research and The Royal Marsden NHS Foundation Trust, Surrey, UK.

Reviews in Endocrine & Metabolic Disorders
|September 13, 2008
PubMed
Summary
This summary is machine-generated.

Radiotherapy effectively treats pituitary adenomas, with hypopituitarism as the main side effect. Modern techniques like stereotactic conformal radiotherapy (SCRT) aim to minimize radiation to normal brain tissue.

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Area of Science:

  • Neuro-oncology
  • Radiation Oncology
  • Endocrinology

Background:

  • Pituitary adenomas require effective treatment for residual or recurrent disease.
  • Radiotherapy (RT) offers excellent tumor control and hormone normalization.
  • Hypopituitarism is the primary late toxicity of RT, with other side effects being rare.

Purpose of the Study:

  • To review the outcomes of conventional fractionated radiotherapy and modern RT techniques for pituitary adenomas.
  • To discuss technical advancements in RT delivery, including stereotactic conformal radiotherapy (SCRT) and stereotactic radiosurgery (SRS).
  • To evaluate the efficacy and toxicity profiles of different RT modalities.

Main Methods:

  • Comprehensive literature review of published data on pituitary adenoma treatment outcomes.
  • Analysis of technical developments in RT delivery, focusing on dose reduction to normal brain.
  • Comparison of conventional fractionated RT with SCRT and single-fraction SRS.

Main Results:

  • SCRT is suitable for all pituitary adenoma sizes with efficacy comparable to conventional RT.
  • Single-fraction SRS is limited to small tumors away from critical structures.
  • No evidence suggests SRS provides faster hormone decline or lesser morbidity than fractionated RT.

Conclusions:

  • Modern RT techniques, particularly SCRT, offer effective pituitary adenoma treatment with comparable efficacy to conventional RT.
  • While aiming to reduce radiation to normal tissues, long-term toxicity data for SCRT is still lacking.
  • Single-fraction SRS has specific limitations and does not offer advantages in hormone normalization speed or reduced morbidity compared to fractionated RT.