This paper describesan application of attenuated total reflectionFourier transform infrared spectroscopy (ATR-FTIR) and surface-enhancedinfrared spectroscopy (SEIRA) to characterize the selective adsorptionof four peptides present in body fluids such as neuromedin B (NMB),bombesin (BN), neurotensin (NT), and bradykinin (BK), which are knownas markers for various human carcinomas. Here, GRP is linked to carcinoma.