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Late effects on human bone marrow after extended field radiotherapy
International Journal of Radiation Oncology, Biology, Physics
|September 1, 1983
Summary
Radiotherapy (RT) significantly depresses bone marrow hematopoietic activity long-term. Compensatory hyperactivity in non-irradiated marrow persists for years, with recovery only seen at lower RT doses.
Area of Science:
- Hematology
- Radiation Oncology
- Medical Imaging
Background:
- Radiotherapy (RT) for lymphoma can impact bone marrow function.
- Understanding long-term hematopoietic effects of RT is crucial for patient management.
Purpose of the Study:
- To investigate the long-term effects of extended radiotherapy on hematopoietic activity in lymphoma patients.
- To assess compensatory mechanisms and recovery potential of bone marrow post-RT.
Main Methods:
- Ferrokinetic studies and surface counting in 32 lymphoma patients post-radiotherapy.
- Bone marrow scintigraphy using 59Fe in 9 patients.
Main Results:
- Persistent depression of hematopoietic activity in irradiated bone marrow areas, even after 13 years.
- Compensatory hyperactivity in non-irradiated bone marrow areas, persisting long-term.
- Recovery of hematopoietic activity observed at RT doses of 20 Gy or lower.
- Extension of hematopoiesis into dormant marrow areas (e.g., femora) and spleen observed.
Conclusions:
- Extended radiotherapy causes long-lasting hypoactivity in irradiated bone marrow, with compensatory hyperactivity elsewhere.
- Hematopoietic recovery is dose-dependent, with lower doses showing potential for recovery.
- Irradiated marrow's activity relates to irradiated volume and RT field configuration.