Hyperpolarized 13C MRSI Monitoring of Pyruvate Metabolism to Assess Drug Action

University Of California, San Francisco, San Francisco CA

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Abstract

Approximately 17,000 new cases of malignant brain cancer are diagnosed per year in the United States. Even with surgical resection, radiation, and chemotherapy, patients with glioblastoma (GBM), the most refractory form of the disease, typically succumb to the disease within 2 years of diagnosis. A major limitation in the development of effective therapies for recurrent GBM is the lack of a reliable method to predict early response to therapy. Monitoring response using conventional magnetic resonance (MR) imaging is often unreliable and are often unable to distinguish treatment effects from tumor response. In animal models of GBM, we recently found that response to temozolomide (TMZ) and PISK pathway inhibitors is associated with a tumor-specific decrease in the conversion of hyperpolarized carbon 13 (130) pyruvate to 13C lactate detectable by non invasive 130 MR spectroscopic imaging (MRSI) as a drop in the ratio of hyperpolarized lactate to pyruvate (Lac/Pyr). We therefore hypothesize that measurement of Lac/Pyr could serve as an early indicator of drug action in patients following treatment with TMZ, PI3K inhibitors, and potentially a range of other agents. This hypothesis will be tested by 1) defining in vitro sensitivity and verifying target inhibition in recurrent human GBM cells exposed to TMZ and other novel targeted agents including XL765 and SAHA 2) defining the effect of the drugs on the conversion of 130 pyruvate to 130 lactate in the drug sensitive/resistant paired GBM cells, and relating these changes to target inhibition and drug sensitivity, 3) determining if the drug-induced changes in 13C pyruvate to 130 lactate conversion that parallel target inhibition and drug sensitivity in vitro also do so in xenografts in vivo, and 4) determining if treatment-induced alterations in pyruvate metabolism detected by hyperpolarized 130 MRSI can be used alone, or in combination with other imaging markers, as a biomarker of target inhibition and early response in clinical trials of recurrent GBM patients. Close interactions with Project 1 and all the Shared Resource Cores will be critical to the successful conduct of the proposed studies.