You have accessJournal of UrologyKidney Cancer: Basic Research & Pathophysiology I (MP08)1 Apr 2020MP08-15 CHARACTERIZATION OF THE METABOLOMIC PROFILE OF FAT-POOR ANGIOMYOLIPOMA AND CLEAR CELL CARCINOMA BY HIGH RESOLUTION MAGIC ANGLE SPINNING MAGNETIC RESONANCE SPECTROSCOPY Melissa Huynh*, Andrew Gusev, Francesco Palmas, Lindsey Vandergrift, Chin-Lee Wu, Leo Cheng, and Adam Feldman Melissa Huynh* Melissa Huynh* More articles by this author , Andrew GusevAndrew Gusev More articles by this author , Francesco PalmasFrancesco Palmas More articles by this author , Lindsey VandergriftLindsey Vandergrift More articles by this author , Chin-Lee WuChin-Lee Wu More articles by this author , Leo ChengLeo Cheng More articles by this author , and Adam FeldmanAdam Feldman More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000000828.015AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: Fat-poor angiomyolipoma (AML) can be difficult to differentiate from renal cell carcinoma (RCC) radiographically and may lead to biopsy or unnecessary intervention. In vivoplatforms with the ability to identify tumor histology based on metabolic profiles may avoid unnecessary procedures & their complications. The metabolomics of AML have not been characterized, & research into this area may provide targetable molecules for large AMLs. In this study, we investigate the metabolomic profile of AMLs compared to clear cell RCC (ccRCC) using high resolution magic angle spinning (HRMAS) magnetic resonance spectroscopy (MRS). METHODS: Tissue samples were obtained from radical or partial nephrectomy specimens that were fresh frozen & stored at -80°C. Tissue HRMAS MRS was performed by a Bruker AVANCE spectrometer. Metabolomic profiles of RCC & adjacent benign renal tissue were compared, and false discovery rates (FDR) accounted for multiple testing. Regions of interest (ROI) with FDR <0.05 were considered potential predictors of ccRCC rather than AML. The Wilcoxon rank sum test was used to compare median MRS relative intensities for candidate predictors. Logistic regression was used to determine odds ratios for risk of malignancy based on abundance of each metabolite. RESULTS: There were 16 ccRCC samples & 7 AML specimens. Candidate predictors of malignancy rather than AML based on FDR p-values include histidine, phenylalanine, phosphocholine, serine, alanine, glutamate, glutathione, glycerophosphocholine, & glutamine. While an abundance of these metabolites is associated with higher risk of malignancy, the odds ratio was particularly high in the 3.5-3.49 ppm spectral region (OR 2.99x106, 95% CI 3.27, 2.73x1012, p=0.033) in ccRCC samples (Table 1). CONCLUSIONS: HRMAS MRS identified metabolites that may help differentiate fat-poor AML from ccRCC. In particular, metabolites in the 3.5-3.49 ppm spectral region increased the risk of harboring RCC. Our findings may contribute to future in vivostudies to help identify which patients require intervention for malignancy & which may be observed for benign AML without requiring biopsy. Source of Funding: NIH Grant #CA115746 © 2020 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 203Issue Supplement 4April 2020Page: e111-e112 Advertisement Copyright & Permissions© 2020 by American Urological Association Education and Research, Inc.MetricsAuthor Information Melissa Huynh* More articles by this author Andrew Gusev More articles by this author Francesco Palmas More articles by this author Lindsey Vandergrift More articles by this author Chin-Lee Wu More articles by this author Leo Cheng More articles by this author Adam Feldman More articles by this author Expand All Advertisement PDF downloadLoading ...