But I'm not more aggressive—a behavior change often tied to testosterone. That's not surprising to Robert Sapolsky, ., a neuroendocrinologist at Stanford University and a leading researcher on stress and behavior. "It's really not the case that testosterone 'causes' aggressive behavior," he says. "Instead, it makes the brain more sensitive to social cues that trigger aggression. And in support of that, a guy's testosterone level isn't a very good predictor of how likely he is to be aggressive."
Finally, it is important for any man with a history of prostate cancer to maintain his perspective on what is important to him. For some, it is enough to be alive and feeling reasonably well despite prostate cancer treatment. Adding a treatment that may stir up anxiety about their cancer may not be worth any benefit they may experience with regard to sex, mood, energy, or vitality. For others, the important thing is to live well. For them, an improved quality of life may be important enough to take on an unknown degree of risk, including a treatment that still lacks approval from the broader medical community.