Optical Biopsy of Amelanotic Melanoma with Raman and Autofluorescence Spectra Stimulated by 785 nm Laser Excitation

Ivan A. Bratchenko; Yulia A. Khristoforova; Lyudmila A. Bratchenko; Alexander A. Moryatov; Sergey V. Kozlov; Ekaterina G. Borisova; Valery P. Zakharov

doi:10.18287/JBPE21.07.020308

Authors

Ivan A. Bratchenko Samara National Research University, Russia
Yulia A. Khristoforova Samara National Research University, Russia
Lyudmila A. Bratchenko Samara National Research University, Russia
Alexander A. Moryatov Samara State Medical University, Russia
Sergey V. Kozlov Samara State Medical University, Russia
Ekaterina G. Borisova Bulgarian Academy of Sciences, Sofia, Bulgaria
Valery P. Zakharov Samara National Research University, Russia

DOI:

https://doi.org/10.18287/JBPE21.07.020308

Keywords:

Raman spectroscopy, autofluorescence, optical biopsy, projection on the latent structure analysis, PLS, amelanotic melanoma, basal cell carcinoma, skin cancer

Abstract

In this work, Raman and autofluorescence spectroscopy in the near-infrared region has been used for examining amelanotic melanoma as the most dangerous type of malignant melanoma. There were 9 patients with amelanotic melanoma, 60 with pigmented melanoma and 120 with basal cell carcinoma enrolled in this study. We studied 9 amelanotic melanoma cases to differentiate them from basal cell carcinoma (n = 120) and pigmented malignant melanoma (n = 60) using portable spectroscopy setup with laser excitation source at 785 nm and low-cost spectrometer. The spectra of the different tumor type were classified using projection on the latent structure analysis with 10-Fold cross-validation. The results of the tumor classification were presented using box-plot diagrams and ROC analysis. We obtained 0.53 and 0.88 ROC AUCs for distinguishing amelanotic melanoma versus (1) pigmented melanoma and (2) basal cell carcinoma respectively based on the joint autofluorescence and Raman spectroscopy analysis that allowed one to diagnose amelanotic melanoma as true melanoma but no basal cell carcinoma.

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