A miniaturized setup for light sheet based fluorescence microscopy is adapted to a conventional microscope and used to measure the uptake and interaction of cytostatic drugs, metabolites and fluorescent dyes in 3D cell cultures. FOM 2013 [P1-D/07] A light sheet module for 3D fluorescence microscopy of tumour cell spheroids: H. Schneckenburger & S. Schickinger & M. Wagner & P. Weber & R. Wittig & T. Bruns (Hochschule Aalen, Germany)