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Related Experiment Videos

Dose/effect relationships for brain metastases

C Nieder1, U Nestle, K Walter

  • 1Department of Radiotherapy, University Hospital of Saarland, Homburg/Saar, Germany.

Journal of Cancer Research and Clinical Oncology
|August 6, 1998
PubMed
Summary
This summary is machine-generated.

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Dose escalation in radiotherapy for brain metastases may improve local control, but complete remission rates did not increase. Tumor histology significantly impacts outcomes, with specific dose recommendations varying by cancer type.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Clinical Oncology

Background:

  • Local control is crucial for long-term survival in patients with brain metastases.
  • Higher radiotherapy doses may improve survival in selected patients with controlled extracranial disease.
  • The efficacy of dose escalation in conventional external-beam radiotherapy for brain metastases requires further investigation.

Purpose of the Study:

  • To determine if dose escalation of radiotherapy can improve local control in patients with brain metastases.
  • To evaluate the relationship between radiation dose and local tumor response.
  • To identify factors influencing local control and progression-free survival.

Main Methods:

  • Analysis of computed tomography scans from 322 patients treated with 25-60 Gy radiotherapy.

Related Experiment Videos

  • Calculation of biologically effective dose (BED10) using the linear-quadratic model.
  • Evaluation of best local response, time to local progression, and survival rates.

    • Main Results:

    • Partial remission rates increased significantly with higher BED, but complete remission rates did not improve.
    • Tumor histology was the most significant factor influencing local control and progression-free survival.
    • Increased BED was associated with a reduced 1-year failure rate (44% to 31%), though not statistically significant (P > 0.05).

    Conclusions:

    • Tumor histology strongly influences local remission and progression-free survival in brain metastases.
    • A BED of at least 72 Gy may be necessary for squamous-cell carcinoma and adenocarcinoma.
    • Doses between 48 Gy and 60 Gy might suffice for small-cell and breast carcinoma, but the optimal dose requires further establishment.