Kathleen Mahoney, M.D., Ph.D. Instructor of Medicine, Harvard Medical School Attending, Beth Israel Deaconess Medical Center Research Fellow, Dana Farber Cancer Institute discusses A Secreted PD-L1 Splice Variant that Covalently Dimerizes and Mediates Immunosuppression at the Seventeenth International Kidney Cancer International Symposium 2018 in Miami FL.