Clinical benefit from ipilimumab therapy in melanoma patients may be associated with serum CTLA4 levels oleh Anna M. Leung, Agnes Fermin Lee, Junko eOzao-Choy, Romela Irene Ramos, Omid eHamid, Steven J. O'Day, Myung eShin-Sim, Donald L. Morton, Mark B. Faries, Peter A. Sieling, Delphine J Lee