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Tumor microcirculation and diffusion predict therapy outcome for primary rectal carcinoma.
Alexander F DeVries1, Christian Kremser, Patrick A Hein
1Department of Radiotherapy and Radiooncology, Ludwig-Franzens Universität Innsbruck, Innsbruck, Austria. devries@uibk.ac.at
Summary
Perfusion indices and apparent diffusion coefficients predict rectal cancer treatment success after chemoradiation. Higher values in non-responders suggest aggressive tumors, aiding therapy outcome prediction.
Area of Science:
- Oncology
- Radiology
- Medical Imaging
Background:
- Rectal cancer treatment involves chemoradiation.
- Predicting therapy response is crucial for patient management.
- Magnetic resonance imaging (MRI) offers quantitative biomarkers.
Purpose of the Study:
- To correlate pre-treatment perfusion indices and apparent diffusion coefficients (ADCs) with chemoradiation therapy outcomes in rectal cancer patients.
- To assess the predictive value of these MRI parameters for treatment response.
Main Methods:
- 34 patients with primary rectal carcinoma (cT3) underwent pre-therapeutic dynamic or diffusion-weighted MRI before chemoradiation.
- Perfusion indices and ADCs were measured within the tumor region.
- Therapy response was defined by absence of perirectal fat invasion post-treatment.
Main Results:
- Significant differences in mean perfusion index and intratumoral fraction of pixels with high perfusion were observed between responders and non-responders (p < 0.001).
- Apparent diffusion coefficients also showed significant effects related to therapy response.
- Higher perfusion parameters were noted in the non-responder group.
Conclusions:
- Perfusion indices and ADCs within the tumor are valuable predictors of preoperative chemoradiation therapy outcome in rectal cancer.
- Elevated parameters in non-responders may indicate increased shunt flow, angiogenic activity, or tumor necrosis.
- These quantitative MRI biomarkers can aid in stratifying patients and optimizing treatment strategies.