Division of Hematology and Oncology, Department of Medicine, UCSF Helen Diller Family Comprehensive Cancer Center, 550 16th Street, 6th Floor, UCSF Box 0981, San Francisco, CA, 94158, USA. li.zhang@ucsf.edu.|Division of Hematology and Oncology, Department of Medicine, University of California, Room HSE301, UCSF Box 1270, 513 Parnassus Ave, San Francisco, CA, 94143-1270, USA.|Department of Epidemiology and Biostatistics, University of California, San Francisco, 550 16th Street, 6th Floor, UCSF Box 0981, San Francisco, CA, 94158, USA.|Research and Development, Nkarta, Inc, 329 Oyster Point Blvd, South San Francisco, CA, 94080, USA.|Department of Research - Translational Biology, Dendreon Pharmaceuticals Inc, 1208 Eastlake Ave E, Seattle, WA, 98102, USA.|Division of Hematology and Oncology, Department of Medicine, University of California, Room HSE301, UCSF Box 1270, 513 Parnassus Ave, San Francisco, CA, 94143-1270, USA.