Autor(es): Oliveira,Andrea Fernandes de ; Santos,Ivan Dunshee de Abranches Oliveira ; Cartaxo,Sidney Bandeira ; Bitar,Renata Andrade ; Enokihara,Mílvia Maria Simões e Silva ; Martinho,Herculano da Silva ; Martin,Airton Abrahão ; Ferreira,Lydia Masako
Data: 2010
Origem: Oasisbr
Assunto(s): Melanoma; Spectrum Analysis, Raman; Diagnosis; Biopsy
PURPOSE: To qualify the FT-Raman spectral data of primary and metastatic cutaneous melanoma in order to obtain a differential diagnosis. METHODS: Ten normal human skin samples without any clinical or histopathological alterations, ten cutaneous melanoma fragments, and nine lymph node metastasis samples were used; 105, 140 and 126 spectra were obtained respectively. Each sample was divided into 2 or 3 fragments of approximately 2 mm³ and positioned in the Raman spectrometer sample holder in order to obtain the spectra; a monochrome laser light Nd:YAG at 1064 nm was used to excite the inelastic effect. RESULTS: To differentiate the three histopathological groups according to their characteristics extracted from the spectra, data discriminative analysis was undertaken. Phenylalanine, DNA, and Amide-I spectral variables stood out in the differentiation of the three groups. The percentages of correctly classified groups based on Phenylalanine, DNA, and Amide-I spectral features was 93.1%. CONCLUSION: FT-Raman spectroscopy is capable of differentiating melanoma from its metastasis, as well as from normal skin.
