Volume 56, Issue 5 pp. 1011-1018
Full Paper

Chemodosimetry of in vivo tumor liposomal drug concentration using MRI

Benjamin L. Viglianti

Benjamin L. Viglianti

Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA

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Ana M. Ponce

Ana M. Ponce

Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA

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Charles R. Michelich

Charles R. Michelich

Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA

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Daohai Yu

Daohai Yu

Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, North Carolina, USA

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Sheela A. Abraham

Sheela A. Abraham

Advanced Therapeutics-Medical Oncology, BC Cancer Agency, Vancouver, Canada

Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada

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Linda Sanders

Linda Sanders

Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA

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Pavel S. Yarmolenko

Pavel S. Yarmolenko

Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, USA

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Thies Schroeder

Thies Schroeder

Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, USA

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James R. MacFall

James R. MacFall

Department of Radiology, Duke University Medical Center, Durham, North Carolina, USA

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Daniel P. Barboriak

Daniel P. Barboriak

Department of Radiology, Duke University Medical Center, Durham, North Carolina, USA

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O. Michael Colvin

O. Michael Colvin

Department of Medicine and Hematology/Oncology, Duke University Medical Center, Durham, North Carolina, USA

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Marcel B. Bally

Marcel B. Bally

Advanced Therapeutics-Medical Oncology, BC Cancer Agency, Vancouver, Canada

Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada

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Mark W. Dewhirst

Corresponding Author

Mark W. Dewhirst

Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA

Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, USA

Duke University Medical Center, Department of Radiation of Oncology, MSRB 201, Box 3455, Durham, NC 27710===Search for more papers by this author
First published: 06 October 2006
Citations: 103

Abstract

Effective cancer chemotherapy depends on the delivery of therapeutic drugs to cancer cells at cytotoxic concentrations. However, physiologic barriers, such as variable vessel permeability, high interstitial fluid pressure, and heterogeneous perfusion, make it difficult to achieve that goal. Efforts to improve drug delivery have been limited by the lack of noninvasive tools to evaluate intratumoral drug concentration and distribution. Here we demonstrate that tumor drug concentration can be measured in vivo using T1-weighted MRI, following systemic administration of liposomes containing both drug (doxorubicin (DOX)) and contrast agent (manganese (Mn)). Mn and DOX concentrations were calculated using T1 relaxation times and Mn:DOX loading ratios, as previously described. Two independent validations by high-performance liquid chromatography (HPLC) and histologic fluorescence in a rat fibrosarcoma (FSA) model indicate a concordant linear relationship between DOX concentrations determined using T1 and those measured invasively. This method of imaging exhibits potential for real-time evaluation of chemotherapeutic protocols and prediction of tumor response on an individual patient basis. Magn Reson Med, 2006. © 2006 Wiley-Liss, Inc.

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