CYCS and thyroid gland papillary and follicular carcinoma: Interestingly, the spectrum of the Papillary Follicular carcinoma (labeled FV-PTC in Fig. 1A) looks like a superposition of the PTC and FC spectra, showing the fingerprints of carotenoids along with a clear enhancement of the bands ascribed to cytochrome c with respect to the spectra of Healthy/Benign tissues.