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Abstract #1022

Multimodal Non-Invasive Imaging of Tumor Hypoxia and Metabolism Using EPR Oxygen Imaging and Hyperpolarized 13C-MRI

Shingo Matsumoto1, Doug Morris2, Martin Lizak2, Jeeva P. Munasinghe2, Keita Saito1, Jan Henrik Ardenkjaer-Larsen3, Sankaran Subramanian1, Nallathamby Devasahayam1, Kevin Camphausen1, Alan Koretsky2, James B. Mitchell1, Murali C. Krishna1

1National Cancer Institute, Bethesda, MD, United States; 2National Institute of Neurological Disorder and Stroke, Bethesda, MD, United States; 3GE Healthcare, Amersham, United Kingdom

Many tumor types can undergo aerobic glycolysis, where tumors can abnormally obtain as much as 50% of their energy (ATP) by metabolizing sugar glucose directly to lactate even in the presence of oxygen. Likewise, approximately one half of tumors exhibit marked hypoxia. Collectively, these traits can contribute to resistance to cancer treatments. Non-invasive assessment of altered tumor metabolism and tissue hypoxia might be useful for both diagnostic and treatment strategies. In this study EPR oxygen imaging and hyperpolarized MRI of 13C-labeled pyruvic acid, are coupled to provide a measure of tumor hypoxia and energy metabolism.