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Multispectral Optoacoustic Tomography (MSOT) is a powerful novel imaging modality that decomposes the spectral response of tissue chromophores in vivo, with high resolution and at depths of up to several centimeters.It provides the possibility to separate endogenous chromophores of interest such as oxy-/deoxy-hemoglobin as well as extrinsically administered photo-absorbing agents including nanoparticles and fluorescent dyes or proteins.Here we show the ability of MSOT to characterize tumors and tumor growth by analyzing anatomical, functional, molecular and kinetic properties of tumor tissue and tumor perfusion.