Leuprolide
"I have advanced prostrate cancer and have found that when I stop or delay a 90-day injection, my PSA climbs. From June 2010 (PSA over 350) through Jan 2013 (PSA 9) my cancer was controlled.  I suspended the shots for 18 months due to cost and my PSA climbed to 270. In 5 months, my PSA is at 4.2."