Fluorescence spectroscopy of epithelial tissue throughout the dysplasia-carcinoma sequence in an animal model: Spectroscopic changes precede morphologic changes

Autor: Lezlee G Coghlan, Urs Utzinger, Irma B. Gimenez-Conti, Andres Zuluaga, Rebecca Richards-Kortum, Michele Follen, Carrie Brookner
Rok vydání: 2001
Předmět:
Zdroj: Lasers in Surgery and Medicine. 29:1-10
ISSN: 1096-9101
0196-8092
DOI: 10.1002/lsm.1078
Popis: Background and Objective: The hamster cheek pouch carcinogenesis model, using chronic treatments of dimethylbenz[a]anthracene (DMBA) was used as a model system to investigate changes in epithelial tissue autofluorescence throughout the dysplasia-carcinoma sequence. Study Design/Materials and Methods: Fluorescence emission spectra were measured weekly from 42 DMBAtreated animals and 20 control animals at 337, 380, and 460 nm excitation. A subset of data in which histopathology was available was used to develop diagnostic algorithms to separate neoplastic and non-neoplastic tissue. The change in fluorescence intensity over time was examined in all samples at excitation-emission wavelength pairs identified as diagnostically useful. Results: Algorithms based on autofluorescence can separate neoplastic and non-neoplastic tissue with 95% sensitivity and 93% specificity. Greatest contributions to diagnostic algorithms are obtained at 380 nm excitation, and 430, 470, and 600 nm emission. Changes in fluorescence intensity are apparent as early as 3 weeks after initial treatment with DMBA, whereas morphologic changes associated with dysplasia occur on average at 7.5‐12.5 weeks after initial treatment. Conclusions: Fluorescence spectroscopy provides a potential tool to identify biochemical changes associated with dysplasia and hyperplasia, which precede morphologic changes observed in histologically stained
Databáze: OpenAIRE
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