Chimeric antigen receptor (CAR) T cell therapy is an emerging form of immunotherapy which engineers a patient's immune cells to better identify and kill cancer cells. While CAR-T cell therapy can cure hard-to-treat cancers, only a small proportion of patients respond favorably. Identifying biomarkers, biological molecules that be predict how a person may respond to a treatment, can help doctors determine which patients will benefit from this therapy. Because CAR-T cell therapy is costly and time-consuming, there is an effort to promote research focused on discovering biomarkers to manage treatment.