Certis Oncology Solutions is a new precision medicine company focused on individualized patient care. Certis’ services are based on a technique known as Orthotopic PDX (Patient-Derived Xenografts). In Greek, orthotopic means “the correct place.” The orthotopic technique takes a very small specimen of the human patient’s tumor and surgically implants it into the corresponding anatomic location (pancreas, liver, lung, etc.) in immunodeficient mice. Concurrent testing of multiple drugs enabled by Orthotopic PDX models presents oncologists with more treatment options – while reducing the time required to select each patient’s optimal treatment.