Abstract
The purpose of this study was to evaluate the ability of MRI to detect magnetic particle uptake into advanced solid malignant tumors and to document the extension of these tumors, carried out in the context of magnetic drug targeting. In a prospective phase I trial, 11 patients were examined with MRI before and after magnetic drug targeting. The sequence protocol included T1-WI and T2-WI in several planes, followed by quantitative and qualitative evaluation of the signal intensities and tumor extensions. In nine patients, a signal decrease was observed in the early follow-up (2–7 days after therapy) on the T2-weighted images; two patients did not show a signal change. The signal changes in T1-WI were less distinct. In late follow-up (4–6 weeks after therapy), signal within nine tumors reached their initially normal level on both T1-WI and T2-WI; two tumors showed a slight signal decrease on T2-WI and a slight signal increase on T1-WI. Within the surveillance period, tumor remission in 3 out of 11 patients was observed, and in 5 patients tumor growth had stopped. The remaining three patients showed significant tumor growth. There was no statistically significant correlation between signal change and response. MRI is a suitable method to detect magnetite particles, deposited at the tumor site via magnetic drug targeting. MRI is therefore eligible to control the success of MDT and to assess the tumor size after the end of therapy.
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Acknowledgments
This study was supported by the Graduiertenkolleg GRK 331 “Temperaturabhängige Effekte in Therapie und Diagnostik” of the German Research Foundation [Deutsche Forschungsgemeinschaft (DFG)].
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The used data are part of the thesis of M.-I. Senfft von Pilsach.
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Lemke, AJ., Senfft von Pilsach, MI., Lübbe, A. et al. MRI after magnetic drug targeting in patients with advanced solid malignant tumors. Eur Radiol 14, 1949–1955 (2004). https://doi.org/10.1007/s00330-004-2445-7
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DOI: https://doi.org/10.1007/s00330-004-2445-7