Raman spectroscopic detection of high-grade cervical cytology: Using morphologically normal appearing cells

Area of Science:

• Biomedical Optics
• Cellular Biochemistry
• Diagnostic Cytology

Background:

• High-grade squamous intraepithelial lesions (HSIL) require accurate detection for timely intervention.
• Current cytological methods may not always detect subtle cellular changes indicative of HSIL.
• Investigating biochemical alterations in morphologically normal cells offers a novel diagnostic avenue.

Purpose of the Study:

• To detect HSIL by identifying biochemical changes in intermediate and superficial cells.
• To evaluate Raman spectroscopy as a tool for discriminating HSIL from negative cytology.
• To assess the diagnostic potential of biochemical signatures in morphologically normal cells.

Main Methods:

• Raman spectra were acquired from intermediate and superficial cells from negative and HSIL ThinPrep specimens.
• Multivariate algorithms, including Principal Component Analysis-Linear Discriminant Analysis (PCA-LDA) and Partial Least Squares Discriminant Analysis (PLS-DA), were employed.
• Random subsets cross-validation was used for robust discrimination analysis.

Main Results:

• The PLS-DA method achieved high sensitivity (95.2-96.1%) and specificity (92.7-94.7%) for HSIL detection.
• PCA-LDA showed moderate performance, with sensitivities ranging from 72.8-75.6% and specificities from 81.9-89.9%.
• Biochemical signatures of morphologically normal cells effectively discriminated between negative and HSIL cytology.

Conclusions:

• Raman spectroscopy can identify HSIL-associated biochemical changes in morphologically normal cells.
• PLS-DA offers a highly sensitive and specific method for HSIL diagnosis using these biochemical signatures.
• Mixed intermediate and superficial cells provide enhanced diagnostic accuracy for HSIL detection.