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Related Experiment Videos

Long-term effects of fenretinide on retinal function

A Decensi1, V Fontana, M Fioretto

  • 1Department of Medical Oncology II, National Institute for Cancer Research, Genoa, Italy.

European Journal of Cancer (Oxford, England : 1990)
|January 1, 1997
PubMed
Summary

Long-term fenretinide (4-HPR) use in women showed subtle retinal function changes, primarily affecting photoreceptor sensitivity. Electroretinogram (ERG) analysis indicated no significant inner nuclear layer alterations at this dosage.

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Area of Science:

  • Ophthalmology
  • Retinal Physiology
  • Pharmacology

Background:

  • Fenretinide (4-HPR) is a synthetic retinoid with potential therapeutic applications.
  • Previous studies suggested potential ocular toxicity at higher doses.
  • Understanding long-term retinal effects is crucial for patient safety.

Purpose of the Study:

  • To evaluate the long-term effects of fenretinide (4-HPR) on retinal function.
  • To assess alterations in electroretinogram (ERG) measures after prolonged fenretinide treatment.
  • To identify predictive factors influencing fenretinide's impact on retinal function.

Main Methods:

  • A phase III intervention trial cohort including 24 women treated with fenretinide (4-HPR) and 18 controls.
  • Electroretinogram (ERG) recordings measuring a-wave and b-wave implicit times and amplitudes under various stimulation conditions.

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  • Multivariate analysis of covariance (MANCOVA) to assess joint effects and identify predictive factors.

    • Main Results:

    • Fenretinide (4-HPR) treatment duration and plasma retinol levels (squared function) significantly influenced ERG measures.
    • A qualitative interaction between age and treatment duration was observed.
    • The b-wave implicit time following cone stimulation was the sole ERG measure significantly affected, suggesting a primary impact on photoreceptor sensitivity.

    Conclusions:

    • Long-term fenretinide (4-HPR) administration at 200 mg/day appears to induce subtle retinal function alterations.
    • The primary effect seems localized to retinal photoreceptor sensitivity.
    • No significant alterations were detected in the inner nuclear layer, contrasting with some previous findings at higher doses.