The SU2C–Dutch Cancer Society (DCS) Tumor Organoids Dream Team has developed a groundbreaking technology that allows oncology samples from patients to be maintained and grown in the laboratory. These growing cancers, called tumor organoids, provide an unprecedented opportunity to combine science’s ability to sequence the DNA of tumors from individual patients with laboratory studies to see if the cancer will respond to or resist specific anticancer treatments. The organoids allow studies of sensitivity and resistance to a large number of anticancer drugs, ultimately helping doctors bring better and more targeted treatments to cancer patients.