Abstract
Purpose
The purpose of this study is to evaluate the time course of early chemotherapy response in patients with aggressive non-Hodgkin's lymphoma (NHL) by magnetic resonance imaging (MRI) and positron emission tomography/computed tomography (PET/CT).
Procedures
Eight patients with histologically proven aggressive NHL were imaged by MRI and PET/CT before treatment (E1), 1 week (E2), and two cycles (E3) after chemotherapy.
Results
The mean tumor volume on MRI was 276 mL at baseline; it decreased 58% at E2 (p < 0.05) and 65% further at E3 (p < 0.05), giving a total decrease of 84% (p < 0.05). All the imaged pre-therapy tumors were strongly positive on PET/CT, with a mean maximum standardized uptake value (SUVmax) of 20. The SUVmax decreased 60% at E2 (p < 0.05) and 59% further at E3 (p < 0.05), giving a total decrease of 83% (p < 0.05). The active tumor burden (mean 229 mL) decreased 66% at E2 (p < 0.05). The tumor volume on MRI correlated with the active tumor volume on fused PET/CT images in the same region of interest at both E1 and E2 (r = 0.88, p < 0.01, respectively).
Conclusions
Standard chemotherapy causes rapid decrease of both tumor metabolic activity and volume as early as 1 week, which continues to decline during therapy. Both volumetric MRI and PET/CT are valuable tools for early treatment response evaluation of aggressive NHL.
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Acknowledgements
This study was supported by the Biomedical Image Quantification/University Alliance Finland and the Elna Savolainen Fund.
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Wu, X., Dastidar, P., Pertovaara, H. et al. Early Treatment Response Evaluation in Patients with Diffuse Large B-Cell Lymphoma—A Pilot Study Comparing Volumetric MRI and PET/CT. Mol Imaging Biol 13, 785–792 (2011). https://doi.org/10.1007/s11307-010-0404-z
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DOI: https://doi.org/10.1007/s11307-010-0404-z