Using colorectal cancer as a model system, the main goal of this PHRT project is to develop and clinically validate novel in vitro tissue culture technology for personalized oncology. Building on highly complementary expertise in bioengineering, organoid biology, tumor biology and immune oncology, improved tumoroid models will be developed that are highly reproducible, scalable, and comprise key cellular components of the TME. The potential predictive power and clinical relevance of these models will be assessed by deriving organoids from patients who are treated in parallel with approved therapies.