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Related Experiment Videos

In vivo laser light distribution in human prostatic carcinoma

C Whitehurst1, M L Pantelides, J V Moore

  • 1Department of Experimental Radiation Oncology, Paterson Institute for Cancer Research, Christie Hospital, Manchester, United Kingdom.

The Journal of Urology
|May 1, 1994
PubMed
Summary

Photodynamic therapy (PDT) for prostate cancer requires understanding laser light diffusion. This study found similar light penetration in benign and malignant prostate tissue, suggesting personalized treatment approaches are necessary for effective PDT outcomes.

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Area of Science:

  • Biomedical Optics
  • Oncology
  • Photodynamic Therapy

Background:

  • Photodynamic therapy (PDT) is a crucial treatment for localized prostate cancer.
  • Understanding laser light diffusion in prostatic tumors is vital for effective PDT.
  • Accurate in situ measurements of light penetration are needed.

Purpose of the Study:

  • To measure the in situ light attenuation of 633 nm red light in human prostate tissue.
  • To compare light diffusion in benign versus malignant prostate tissue.
  • To inform the optimal design of PDT treatment protocols for prostate cancer.

Main Methods:

  • Utilized a novel interstitial fiber-optic method for in situ light attenuation measurements.
  • Measured light delivery and detector fiber attenuation at varying interfiber separations in 11 patients.

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  • Analyzed attenuation coefficients (sigma eff) for both benign and malignant prostate tissues.

    • Main Results:

    • Mean attenuation coefficients for benign (0.35 +/- 0.02 mm-1) and malignant (0.36 +/- 0.02 mm-1) prostate tissue were statistically similar (p = .58).
    • Intraglandular variation in light attenuation was minimal in bilateral studies (p = 0.23).
    • Significant interpatient variation in attenuation (0.28 to 0.48 mm-1) was observed, indicating biological differences.

    Conclusions:

    • Prostate tissue exhibits similar optical densities for 633 nm red light, regardless of malignancy.
    • Interpatient variability in light attenuation necessitates individualized PDT treatment planning.
    • A predictive model suggests 4 cylindrical diffusers can treat approximately 25 ml of prostatic tumor volume with PDT.