title: Native cellular fluorescence can identify changes in epithelial thickness in-vivo in the upper aerodigestive tract.
abstract: BACKGROUND
  Change in epithelial thickness is part of the neoplastic transformation process of the upper aerodigestive tract. The quantitation of native cellular fluorescence (NCF) may represent a noninvasive means of distinguishing such a change.
  
  
  METHODS
  Nineteen patients with squamous neoplasms and 12 surgical specimens from cancer patients were analyzed for NCF using a hand-held fiber optic probe attached to a fluorescent spectrometer. Tumors and normal sites were analyzed for fluorescence, and tissue samples were obtained. Ratios of intensities of various emitted wavelengths were computed to quantitate and compare various spectral patterns. These ratios were then correlated with mucosal thickness.
  
  
  RESULTS
  The 330 nm peak in the excitation scan (lambda Ex 200 to 360 nm, lambda Em 380 nm) was lost in the tumors compared with the normal sites. The 390 nm peak in the emission scan (lambda Ex 340 nm, lambda Em 360 to 660 nm) was also lost. The 290 nm/330 nm ratio in the in-vivo excitation scan (lambda Ex 200 to 360 nm, lambda Em 380 nm) correlated with changes in epithelial thickness. The 390/450 ratio in the emission scan (lambda Ex 340 nm, lambda Em 360 to 660 nm) correlated negatively with the mean epithelial thickness.
  
  
  CONCLUSIONS
  Native cellular fluorescence analysis can identify changes in neoplastic tissues, including changes in epithelial thickness.
mesh_terms: D000328:Adult; D000368:Aged; D002278:Carcinoma in Situ / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D002471:Cell Transformation, Neoplastic / Q000473:pathology*; D004848:Epithelium / Q000473:pathology; D004938:Esophageal Neoplasms / Q000473:pathology; D005260:Female; D005336:Fiber Optic Technology / Q000295:instrumentation; D005453:Fluorescence; D006258:Head and Neck Neoplasms / Q000473:pathology*; D006801:Humans; D007822:Laryngeal Neoplasms / Q000473:pathology; D007972:Leukoplakia, Oral / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000473:pathology; D009361:Neoplasm Invasiveness; D055100:Optical Fibers; D010610:Pharyngeal Neoplasms / Q000473:pathology; D013050:Spectrometry, Fluorescence / Q000295:instrumentation; D013056:Spectrophotometry, Ultraviolet / Q000295:instrumentation