KI researchers in the laboratories of David H. Koch Institute Professor Robert Langer and David H. Koch Professor of Engineering Michael Cima have developed an implantable device that could allow doctors to test drugs in patients before prescribing chemotherapy. When implanted in a tumor, this tiny device diffuses small doses of up to 30 different drugs — or combinations thereof — in surrounding tumor cells. After one day, the implant and a small biopsy of surrounding tissue are removed, allowing researchers to study and rank the efficacy of drugs. This research was featured extensively in the news, including in New Scientist, The Scientist, and The Boston Herald. This device is now an integral part of multiple translational projects, including a Bridge Project collaboration between David H. Koch Professor of Biology Michael Yaffe and colleagues at Dana-Farber/Harvard Cancer Center to test combination drug therapies for advanced prostate cancer.