Gerstner Sloan Kettering Graduate School of Biomedical Sciences 1 article published in JoVE Cancer Research Surface-enhanced Resonance Raman Scattering Nanoprobe Ratiometry for Detecting Microscopic Ovarian Cancer via Folate Receptor Targeting Chrysafis Andreou1, Anton Oseledchyk1, Fay Nicolson1, Naxhije Berisha1,2, Suchetan Pal1, Moritz F. Kircher1,3,4,5,6,7 1Department of Radiology, Memorial Sloan Kettering Cancer Center, 2Department of Chemistry, The Graduate Center of the City University of New York, 3Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, 4Center for Molecular Imaging and Nanotechnology (CMINT), Memorial Sloan Kettering Cancer Center, 5Gerstner Sloan Kettering Graduate School of Biomedical Sciences, 6Department of Radiology, Weill Cornell Medical College of Cornell University, 7Dana-Farber Cancer Institute and Harvard Medical Center Ovarian cancer forms metastases throughout the peritoneal cavity. Here, we present a protocol to make and use folate-receptor targeted surface-enhanced resonance Raman scattering nanoprobes that reveal these lesions with high specificity via ratiometric imaging. The nanoprobes are administered intraperitoneally to living mice, and the derived images correlate well with histology.