Polarized Reflectance Spectroscopy for Pre-Cancer Detection

Early detection of cancer and its curable precursors remains the best way to ensure patient survival and quality of life. Thus, highly selective, sensitive and cost-effective screening and diagnostic techniques to identify curable pre-cancerous lesions are desperately needed. Precancers are characterized by increased nuclear size, increased nuclear/cytoplasmic ratio, hyperchromasia and pleomorphism, which currently can only be assessed through an invasive, painful biopsy. Here, we describe the development of a non-invasive optical technique based on polarized reflectance spectroscopy that has the potential to provide in real time diagnostically useful information for pre-cancer detection. Our results demonstrate that polarized reflectance spectroscopy can be used to selectively detect the size-dependent scattering characteristics of nuclei in vivo. We gradually progress from cell suspensions to realistic three-dimensional tissue models of epithelium, then to cervical biopsies and, finally to in vivo studies on normal volunteers and clinical patients.

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