A recent study of 6000 men with localized prostate cancer demonstrated a marked reduction in cancer recurrence with the use of aspirin. A 57% reduction in recurrence was noted.
This simple measure is worth employing in anyone with a history of prostate cancer, so tell someone you know who has had either surgery or xray treatment for their disease.
http://jco.ascopubs.org/content/early/2012/08/26/JCO.2011.41.0308.abstract