Systemic and tumor-directed therapy for oligometastatic prostate cancer: study protocol for a phase II trial for veterans with de novo oligometastatic disease oleh Neil R. Parikh, Claudia Huiza, Jill S. Patel, Sonny Tsai, Nathisha Kalpage, May Thein, Sage Pitcher, Steve P. Lee, Warren S. Inouye, Mark L. Jordan, Homayoon Sanati, Lida Jafari, Carol J. Bennett, Greg E. Gin, Amar U. Kishan, Robert E. Reiter, Michael Lewis, Ahmad Sadeghi, William J. Aronson, Isla P. Garraway, Matthew B. Rettig, Nicholas G. Nickols