Volume 1 Supplement 1

1st Scientific Meeting of the Head and Neck Optical Diagnostics Society

Open Access

Diagnosis of head & neck malignancy using fluorescence spectroscopy and imaging

  • Christian Stephan Betz1,
  • Thomas Makriniotis1,
  • Herbert Stepp2,
  • Waseem Jerjes3,
  • Tahwinder Upile3,
  • Colin Hopper3 and
  • Andreas Leunig1
Head & Neck Oncology20091(Suppl 1):O4

DOI: 10.1186/1758-3284-1-S1-O4

Published: 28 July 2009

Upper aerodigestive tract (UADT) carcinomas continue to be the 5th most common cancer. Early diagnosis is often delayed as tumour precursors or early cancers are hardly visible and not picked up by common imaging methods. Fluorescence spectroscopy and imaging seems able to improve the detection and delimitation of these lesions.

Fluorescence diagnostic methods usually pick up a "mixed bag" of signals from endogenous fluorophores such as tryptophan, collagen, elastin, NADH and FAD. As some of these show a tumour specific distribution, this can be exploited to distinguish tissues in vivo. The fluorescence contrast is even slightly enhanced by using exogenously applied fluorescent markers or their precursors (e.g., 5-aminolevulinic acid induced Protoporphyrin IX). Even though the sensitivity to detect malignant lesions seems to be improved by combining fluorescence diagnostic methods with normal inspection according to the literature and to our own experience, the methods are rather unspecific as chronic inflammations cause results similar to neoplastic disease.

Recent advances include the possibility to extract true spectra of single fluorophores ("intrinsic spectra") by mathematically eliminating the undesired influences of scattering and absorption. As well, tumour-specific enzymes are about to be specifically targeted by fluorescent markers (so called "smart probes") in order to improve both sensitivity and specificity.

Due to the lack of specificity, fluorescence spectroscopy and imaging are so far mostly feasible for screening purposes. If combined with other optical techniques such as ESS or OCT, however, a comprehensive non-invasive tissue diagnosis seems possible.

Authors’ Affiliations

(1)
Department of Otorhinolaryngology, Head & Neck Surgery, Ludwig Maximilian University Munich
(2)
Laser-Research Laboratory, LIFE Center, Ludwig Maximilian University
(3)
Department of Oral and Maxillofacial Surgery, University College London Hospital

Copyright

© Betz et al; licensee BioMed Central Ltd. 2009

This article is published under license to BioMed Central Ltd.

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