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Local physiological changes during photodynamic therapy.

Theresa M Busch1

  • 1Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6072, USA. buschtm@mail.med.upenn.edu

Lasers in Surgery and Medicine
|June 22, 2006
PubMed
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Photodynamic therapy (PDT) significantly alters tumor oxygenation and blood flow during treatment. These measurable physiological changes, including hypoxia, are linked to treatment effectiveness and can be controlled by the regimen.

Area of Science:

  • Oncology
  • Biophysics
  • Medical Physics

Background:

  • Photodynamic therapy (PDT) is a cancer treatment modality.
  • Tumor oxygenation and blood flow are critical factors influencing PDT efficacy.
  • Understanding PDT's impact on tumor physiology is essential for optimizing treatment.

Purpose of the Study:

  • To provide an overview of photodynamic therapy (PDT)-mediated effects on tumor oxygenation and blood flow during illumination.
  • To explore the causes, consequences, and significance of these physiological changes.
  • To correlate these changes with treatment outcomes.

Main Methods:

  • Tissue oxygen tension measurement using the Eppendorf pO2 Histograph.
  • Spatial quantification of hypoxia using EF3 and EF5 antibodies.

Related Experiment Videos

  • Monitoring of tissue oxygenation and blood flow via diffuse reflectance and correlation spectroscopy.

    • Main Results:

    • Severe hypoxia was observed in vivo during PDT, resulting from oxygen consumption and/or reduced vascular perfusion.
    • Oxygen depletion patterns are spatially definable and can be controlled by the treatment regimen, acting as a therapy-limiting factor.
    • PDT-induced changes in tumor oxygenation and blood flow during illumination correlate with treatment response and outcome.

    Conclusions:

    • Photodynamic therapy induces distinct, measurable alterations in tumor oxygen and blood flow during the illumination phase.
    • These physiological changes are significant and may ultimately impact the overall efficacy of PDT treatments.
    • The study highlights the importance of monitoring and controlling tumor oxygenation and perfusion during PDT.