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Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
13:48

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Published on: May 29, 2012

Raman Spectroscopy for Differentiating High- and Low-Grade Canine Cutaneous Mast Cell Tumours.

José Catarino1,2,3,4, Susana Silva5, Susana Novais5

  • 1I-MVet, Faculdade de Medicina Veterinária, Universidade Lusófona-Centro Universitário de Lisboa, Lisboa, Portugal.

Veterinary and Comparative Oncology
|June 24, 2026
PubMed
Summary
This summary is machine-generated.

Raman spectroscopy (RS) shows promise in differentiating canine cutaneous mast cell tumours (MCTs) grades. This technique detects biochemical differences, offering a potential objective biomarker to complement histological grading for these variable tumours.

Keywords:
Raman spectroscopycaninemast cell tumoursoncology

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Area of Science:

  • Veterinary oncology
  • Biomedical optics
  • Biochemistry

Background:

  • Canine cutaneous mast cell tumours (MCTs) exhibit unpredictable clinical behavior, challenging accurate prognostication.
  • Current histological grading methods for MCTs have limitations, including interobserver variability and instances of low-grade tumours behaving aggressively.
  • There is a need for objective, complementary biomarkers to improve the prognostic accuracy for canine MCTs.

Purpose of the Study:

  • To explore the potential of Raman spectroscopy (RS) as a non-destructive method for differentiating low-grade from high-grade canine cutaneous MCTs.
  • To identify characteristic biochemical vibrational signatures indicative of MCT grade using RS.
  • To assess the feasibility of RS as an objective tool to complement traditional histological grading.

Main Methods:

  • Eighteen formalin-fixed canine cutaneous MCT samples (10 low-grade, 8 high-grade) were analyzed using Raman spectroscopy with a 785 nm laser.
  • Raman spectra were pre-processed with baseline correction and normalized to the phenylalanine band at 1007 cm⁻¹.
  • Statistical analysis, including Shapiro-Wilk and Mann-Whitney U tests, was used to compare spectral data between tumour grades.

Main Results:

  • The normalization band at 1007 cm⁻¹ showed no significant difference between low- and high-grade tumours, validating its use.
  • A significant increase in the tyrosine-associated band at 860 cm⁻¹ was observed in high-grade MCTs (p=0.033).
  • Ratios normalized to the 1007 cm⁻¹ peak, particularly 1007/1299 and 1007/1301-1320, significantly discriminated between grades (p<0.05), with higher values in low-grade tumours.

Conclusions:

  • Raman spectroscopy successfully identified distinct biochemical fingerprints differentiating low-grade and high-grade canine cutaneous MCTs.
  • The technique revealed significant differences in spectral regions associated with amino acids, lipids, and nucleic acids between tumour grades.
  • RS holds potential as a complementary diagnostic tool for characterizing canine MCTs, warranting further investigation in larger studies with clinical outcome data.