One of the unique characteristics of prostate cancer is its responsiveness to the withdrawal of testosterone. This “Achilles Heel” of prostate cancer was discovered in the 1940’s when surgical removal of the testicles was shown to induce cancer remissions. In 1985, Lupron, an injectable medication that works by tricking the testicles into ceasing testosterone production, was FDA approved. Orchiectomy, or surgical removal of the testicles, has been declining in popularity ever since.