Gene-modified cell therapy for the treatment of cancer and other diseases is a rapidly growing area of clinical research. The therapeutic use of engineered cells has necessitated the development of novel lab tests for assessing patient safety and efficacy. In this article Dr Chad Galderisi explores how unique applications of tools such PCR and flow cytometry can be used to provide critical and complementary data that is needed to bring new life saving treatment options to patients. https://ow.ly/z15v50PNHMt