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Related Experiment Videos

Cataractogenesis after total body irradiation

Y Belkacémi1, M Ozsahin, F Pène

  • 1Department of Radiation Oncology, Hôpital Tenon, Paris, France.

International Journal of Radiation Oncology, Biology, Physics
|April 1, 1996
PubMed
Summary

High dose rate total body irradiation (TBI) significantly increases cataract risk after bone marrow transplantation (BMT). Heparin administration may protect against cataract formation, while radiation shows a protective effect on posterior capsule opacification.

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Area of Science:

  • Ophthalmology
  • Hematology
  • Oncology

Background:

  • Cataract formation is a known complication following total body irradiation (TBI) before bone marrow transplantation (BMT).
  • Understanding prognostic factors for TBI-induced cataracts is crucial for patient management and follow-up.

Purpose of the Study:

  • To evaluate prognostic factors influencing cataract formation after TBI.
  • To assess the ophthalmologic follow-up of patients who developed cataracts post-TBI and BMT.

Main Methods:

  • Retrospective analysis of 494 patients undergoing TBI prior to BMT between 1980 and 1992.
  • Evaluation of TBI parameters including dose rate (LOW, MEDIUM, HIGH) and fractionation (single vs. fractionated dose).
  • Analysis of patient characteristics, conditioning regimens, and prophylactic treatments (e.g., heparin for VOD, steroids).

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Main Results:

  • A 5-year estimated cataract incidence of 23% was observed.
  • Higher instantaneous dose rates of TBI were significantly associated with increased cataract incidence (HIGH group: 54% vs. LOW group: 3.5%).
  • Heparin administration for veno-occlusive disease (VOD) prophylaxis showed a protective effect against cataract formation (5-year ECI 16% vs. 28%).
  • Multivariate analysis identified high instantaneous dose rate and heparin administration as independent factors influencing cataract incidence.

Conclusions:

  • High instantaneous dose rate during TBI is a primary risk factor for cataract development.
  • Heparin administration appears to have a protective role in preventing TBI-induced cataracts.
  • Ionizing radiation demonstrated a protective effect on posterior capsule opacification after cataract surgery.