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Fast neutron irradiation for prostate cancer
Jeffrey D Forman1, Mark Yudelev, Susan Bolton
1Department of Radiation Oncology, Wayne State University, Detroit, MI, USA.
Cancer Metastasis Reviews
|December 6, 2002
Summary
Fast neutron irradiation, combined with photons, offers optimal prostate cancer treatment outcomes. Treating patients with neutrons first significantly improves disease-free survival compared to standard photon therapy.
Area of Science:
- Oncology
- Radiation Oncology
- Medical Physics
Background:
- Fast neutron irradiation has been explored for prostate cancer treatment.
- Previous studies investigated various dose levels and treatment sequences.
Purpose of the Study:
- To summarize progress in fast neutron irradiation for prostate cancer (1991-2001) at Wayne State University.
- To evaluate dose-finding and sequencing in Phase II and III trials.
Main Methods:
- Summarized results from three Phase II dose-finding studies (15, 9, 10, 11 nGy).
- Analyzed a randomized Phase III trial comparing neutron-first vs. neutron-last sequences.
- Assessed tumor control, normal tissue complications, and disease-free survival.
Main Results:
- A combination of 50% neutrons and 50% photons (10 nGy neutrons, 40 Gy photons) yielded the best balance of tumor control and complications.
- Neutron-first treatment resulted in 93% disease-free survival, compared to 73% for neutron-last.
- Patients with adverse risk factors showed improved disease-free survival with neutron-containing regimens.
Conclusions:
- Fast neutron irradiation, particularly when sequenced first, demonstrates significant benefits in prostate cancer treatment.
- Neutron radiation can be safely delivered and may be superior to standard photon therapy for select patients.
- Further research is warranted to expand neutron radiation's role in other clinical sites.