Dynamic contrast-enhanced magnetic resonance imaging of human cervical carcinoma xenografts: Pharmacokinetic analysis and correlation to tumor histomorphology

Background and purpose: Biomarkers that can predict the outcome of treatment accurately are needed for treatment individualization in advanced carcinoma of the uterine cervix. The potential of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) was investigated in the present preclinical study. Materials and methods: CK-160 and TS-415 human cervical carcinoma xenografts were subjected to DCE-MRI at 1.5 T using a spatial resolution of 0.23 x 0.47 x 2.0 mm(3). Parametric images of K-trans (the volume transfer constant of Gd-DTPA) and v(e) (the extravascular extracellular volume fraction) were produced by pharmacokinetic analysis of the DCE-MRI data and compare with the histomorphology of the imaged tissue. Results: Analysis of small homogeneous tumor regions showed that K-trans, but not v(e), differed significantly between parenchymal tissue, connective tissue, and necrotic tissue, consistent with the vascularity of these comparaments. however, strong correlations between K-trans and the fractional volume of compartments would not be detected for larger tumor regions, primarily because the majority of the voxels represented a chaotic mixture of parenchymal, connective, and necrotic tissue. Conclusion: The potential of DCE-MRI in providing detailed information on the histomorphology of cervical carcinoma is limited, mainly because the tumor tissue shows significant morphological heterogeneity at the subvoxel level. (C) Elsevier Ireland Ltd. All rights reserved. Radiotherapy and Oncology 97 (2010) 217-224