|Investigating Cancer in Animal Models Using MRI & MRS|
MR Imaging Based Detection of Glial Brain Tumors in
Mice After Anti-Angiogenic Treatment
Bob C. Hamans1, An Claes1, Giulio Gambarota1, Olaf van Tellingen2, Pieter Wesseling1, Cathy N. Maass1, Arend Heerschap1, William P.J. Leenders1
1Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands; 2Dutch Cancer Institute, Amsterdam, Netherlands
Use of USPIO as a blood pool contrast agent allows detection of (areas in) tumors that are invisible in conventional Gd-DTPA MRI because of an intact blood brain barrier, such as seen after anti-angiogenic therapy. USPIO imaging may provide more accurate tumor delineation in glioma therapy than conventional Gd-DTPA imaging.
A Proof-Of-Principle Multiparametric in Vivo Study of
Tumor Microenvironment Using a MRI Compatible PET Insert
Daniel Procissi1, Thomas Sheung Chee Ng1, 2, Xiaowei Zhang1, Yibao Wu3, Ciprian Catana4, Hargun Sohi1, Simon R. Cherry3, Andrew A. Raubitschek5, Russell E. Jacobs1
1California Institute of Technology, Pasadena, California , USA; 2University of Southern California, Los Angeles, California , USA; 3University of California, Davis, Davis, California , USA; 4Massachusetts General Hospital, Boston, Massachusetts, USA; 5City of Hope National Cancer Center, Duarte, California , USA
The ability to assess therapeutic response to cancer treatment is an essential requirement for the development of new types of therapeutic agents. In this perspective both PET and MRI provide unique windows into tumor microenvironment and can potentially probe therapy induced functional and anatomical changes of local tissue. Here we show how it is possible to design and implement an in vivo imaging protocol which allows the simultaneous acquisition of dynamic contrast enhanced (DCE), dynamic 18F-FDG PET and diffusion weighted imaging (DWI) with basic anatomical images using a combined PET/MR scanner.
Why Do Ductal Carcinoma in Situ Lesions
Enhance on Dynamic Contrast Enhanced MRI of the Breast? Using X-Ray
Fluorescence and MRI to Track the Spatial Distribution of Gd-DTPA in
Sanaz Arkani Jansen1, Tatjana Paunesku, Gayle Woloschak, Stefan Vogt, Suzanne Conzen, Gillian M. Newstead, Gregory Karczmar
1University of Chicago, Chicago, Illinois, USA
Greater sensitivity and specificity of DCEMRI to the preinvasive breast cancer ductal carcinoma in situ (DCIS) is needed. Furthermore, the mechanism for contrast enhancement of DCIS lesions on DCEMRI is not clear. We show that: (i) murine DCIS lesions exhibit contrast uptake in vivo, and (ii) Gd-DTPA can leave blood vessels to enter mammary ducts distended with DCIS. This is a new insight into the mechanism for contrast enhancement of DCIS lesions in DCEMRI. Understanding the uptake of gadolinium in mammary ducts may lead to improvements in imaging methods, mathematical modeling and interpretation of DCEMRI data.
Hypoxia and Elevated Total Choline Are Associated
with ‘stem-Like’ Cancer Cells in Breast Cancer Xenograft in Vivo: An MR,
SPECT/CT, and Optical Study
Balaji Krishnamachary1, Marie-France Penet1, Sridhar Nimmagadda1, Meiyappan Solaiyappan1, Dmitri Artemov1, Kristine Glunde1, Arvind P. Pathak1, Venu Raman1, Martin G. Pomper1, Zaver M. Bhujwalla1
1The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
The discovery of cancer cells with stem-like markers offers new paradigms for understanding and treating tumor recurrence and metastasis. These stem-like cancer cell populations are more drug resistant and more likely to metastasize. Recent studies suggest that hypoxia provides a suitable niche for stem cells to maintain their precursor status. We have previously shown in a human prostate cancer model that phosphocholine, total choline and choline kinase increase with hypoxia. Here we show in a human breast cancer model that in addition to elevated total choline, the expression of CD44, a breast cancer stem cell marker, increases in hypoxic regions.
Correlation Between Choline Concentration (H-MRS) and
Choline Uptake (Cho-PET) and Early Effect of External Radiation Therapy
on Both Parameters in an Experimental Tumor Model
Denis Jean Rommel1, Frank Peeters1, Jorge Abarca-Quinones1, Nicolas Christian1, Max Lonneux1, Anne Bol1, Daniel Labar1, Vincent Gregoire1, Thierry Duprez1
1Universite Catholique de Louvain, 1200 Brussels, Belgium
We investigated in a rodent tumor model the correlation between choline concentration at 3.0 T H-MRS and the choline uptake at PET. We recorded the early (72 hours) variations of the two parameters after external radiation therapy. No significant pre-therapeutic correlation was found. Opposite evolution after treatment was observed with expected decrease in choline concentration, but strong and paradoxical increase in choline uptake presumptively due to vasodilatation and reactive inflammatory changes.
In Vivo Measurement of Hypoxia in Brain Tumors
by QBOLD MRI Methods
Joel Richard Garbow1, Sarah C. Jost1, Xiang He1, Dmitriy A. Yablonskiy1
1Washington University in St. Louis, Saint Louis, Missouri, USA
Tumor hypoxia and its downstream effects are of considerable interest in both basic and clinical oncology research due to their negative impact on response to various cancer therapies and promotion of metastasis. Diagnosing tumor hypoxia non-invasively could provide a significant advancement in cancer treatment and will be a key to implementing emerging targeted cancer therapies. Here we report the results of an initial study of hypoxia in a mouse model of high-grade glioma. Our approach to quantifying tumor hypoxia is based on a recently proposed Quantitative Blood Oxygenation Level Dependent (qBOLD) model of BOLD contrast in MRI.
Comparative Study of Tumor Lactate and
Tumor Vasculature in Aggressive and Indolent Prostate Cancer Animal
Models by 2D-MR Spectroscopic Imaging and DCE-MRI
Jadegoud Yaligar1, Sunitha B. Thakur1, Mihaela E. Lupu1, Ya Wang1, Cornelia C. Matei1, Kristen L. Zakian1, Jason A. Koutcher1
1Memorial Sloan-Kettering Cancer Center, New York, USA
Lactate is marker of tumor malignancy, hypoxia and facilitates progression of malignant disease, there by defy tumor response to radiation and chemotherapy. Aim of this study to compare lactate concentration in aggressive (R3327-AT) and indolent Dunning H (DH) prostate tumor to determine potential of lactate as marker of tumor aggressiveness. Lactate is not detected at low tumor volume and is increased with tumor volume 2200mm3 there after it decreased at 2500mm3 in R3327-AT tumors where as in DH tumors lactate is not detected at low tumor volume-high tumor volume. DCE-MRI parameters are decreased with increased tumor volume in both tumors.
|17:24||370.||High Spatio-Temporal Resolution PHe Mapping of a Rat
Glioma Derived from PH-Dependent Spin-Lattice Relaxivity
Xiaomeng Zhang1, Gary V. Martinez2, Maria L. Garcia-Martin3, Mark Woods, Dean Sherry, Robert J. Gillies, 12
1University of Arizona, Tucson, Arizona , USA; 2Arizona Cancer Center, Tucson, Arizona , USA; 3Instituto de Investigaciones Biomedicas, Spain
The extracellular pH (pHe) of cancers is acidic and inhibiting this acidity will inhibit metastases. Methods to image pHe in brain tumors based on relaxivity of a pH-dependent contrast reagent (CR), Gd-DOTA-4AmP were developed. We investigated the single injection of a mixture of DyDOTP with GdDOTA-4AmP. The ¦¤T1, and ¦¤T2* induced by the Gd-CR exhibited similar pH-dependence, while the pH-independent Dy-CR reduced T2* with negligible effects on the T1. Thus, with calibration, co-injection of this cocktail can enable dynamic calculation of spatially localized unique pH values.
Towards In Vivo Brain Tumor Phenotyping with
Proton CSI Pattern Perturbation
Rui Vasco Simões1, 2, Sebastián Cerdán3, Carles Arús1, 4
1Universitat Autonoma de Barcelona, Cerdanyola del Vallès, Spain; 2Universidade de Coimbra, Coimbra, Portugal; 3Instituto de Investigaciones Biomedicas “Alberto Sols” UAM-CSIC, Madrid, Spain; 4Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
Here we show that challenging tumor metabolism in vivo (mice bearing a GL261cells brain glioma) by a defined perturbation (hyperglycemia) produces MR spectral pattern changes when monitored by 1H-CSI, which recapitulate those recently described by single-voxel 1H-MRS. This gives us a first insight into brain tumor heterogeneity, as inspected from a dynamic response perspective to a certain metabolic challenge, and suggests a way for increasing the dynamic range of spectral pattern changes of use for improved brain tumor typing and grading.
Imaging the Metastasis of Cancer Cells from a Primary
Tracey Yik May Lui1, 2, Jonathan Ashchar Snir1, 2, Beth Dun1, 2, Alfred Harvey3, Ron Pettis3, Paula J. Foster1, 2
1Robarts Research Institute, London, Canada; 2University of Western Ontario, London, Canada; 3Becton Dickinson Techonologies, Durham, USA
The lymphatic system is a route in which cancer cells use to metastasize to distant parts of the body. Once cancer cells are found in the lymph nodes a poor patient prognosis is to be expected. Studying the behaviour of cancer cells in the lymphatic system is crucial to prevent/treat metastatic cancer. Using cellular MRI techniques and a unique model involving the implantation of iron-labeled cancer cells directly into the lymph node of a mouse, we show for the first time that cancer cells which have disseminated from the primary tumor can be tracked in-vivo to a distant node.