Fig. 5

Spectroscopic and statistical analysis on a patient exhibiting hyperplastic nodules, dysplastic lesions and hepatocellular carcinoma. Spectra were acquired using SR-FTIR on frozen tissue sections from the patient #37 and principal component analysis (PCA) was performed on the frequency domains a 3000–2840 cm⁻¹, c 1760–1480 cm⁻¹, e 1480–1360 cm⁻¹, g 1360–1180 cm⁻¹ and i 1180–950 cm⁻¹. The average spectra corresponding to cirrhotic, dysplastic (DN) and tumor nodules (HCC) were extracted and superimposed (b, d, f, h, j)