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SIRT of liver metastases: physiological and pathophysiological considerations

  • Christophe Van de WieleEmail author
  • Alex Maes
  • Eddy Brugman
  • Yves D’Asseler
  • Bart De Spiegeleer
  • Gilles Mees
  • Karin Stellamans
Review Article

Abstract

Available literature on the differences in circulation and microcirculation of normal liver and liver metastases as well as in rheology of the different radiolabelled microspheres [99mTc-labelled macroaggregates of albumin (MAA), 90Y-TheraSpheres and 90Y-SIR-spheres] used in selective internal radiation therapy (SIRT) are reviewed and implications thereof on the practice of SIRT discussed. As a result of axial accumulation and skimming, large microspheres are preferentially deposited in regions of high flow, whereas smaller microspheres are preferentially diverted to regions of low flow. As flow to normal liver tissue is considerably variable between segments and also within one segment, microspheres will be delivered heterogeneously within the microvasculature of normal liver tissue. This non-uniformity in microsphere distribution in normal liver tissue has a significant “liver-sparing” effect on the dose distribution of 90Y-labelled microspheres. Arterial flow to liver metastases is most pronounced in the hypervascular rim of metastases, followed by the smaller metastases and finally by the central hypoperfused region of the larger metastases. Because of the wide variability in size of labelled MAAs and because of the skimming effect, existing differences in flow between metastatic lesions of variable size are likely exaggerated on 99mTc-MAA scintigraphy when compared to 90Y-TheraSpheres and 90Y-SIR-spheres (smaller variability in size and probably also in specific activity). Ideally, labelled MAAs would contain a size range similar to that of 90Y-SIR-spheres or 90Y-TheraSpheres. Furthermore, the optimal number of MAA particles to inject for the pretreatment planning scintigraphy warrants further exploration as it was shown that concentrated suspensions of microspheres produce more optimal tumour to normal liver distribution ratios. Finally, available data suggest that the flow-based heterogeneous distribution of microspheres to metastatic lesions of variable size might be optimized, that is rendered more homogeneous, through the combined use of angiotensin II and degradable starch microspheres.

Keywords

Selective internal radiation therapy Liver metastases Radiolabelled microspheres 

Notes

Conflicts of interest

None.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Christophe Van de Wiele
    • 1
    Email author
  • Alex Maes
    • 2
    • 3
  • Eddy Brugman
    • 4
  • Yves D’Asseler
    • 1
  • Bart De Spiegeleer
    • 5
  • Gilles Mees
    • 1
  • Karin Stellamans
    • 6
  1. 1.Department of Nuclear Medicine (P7)University Hospital GhentGhentBelgium
  2. 2.Department of Nuclear MedicineAZ GroeningeKortrijkBelgium
  3. 3.Department of Morphology and Medical ImagingUniversity Hospital LeuvenLeuvenBelgium
  4. 4.Department of RadiologyAZ GroeningeKortrijkBelgium
  5. 5.Department of Analytical ChemistryUniversity GhentGhentBelgium
  6. 6.Department of Radiotherapy and Medical OncologyAZ GroeningeKortrijkBelgium

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