According to a scholarly study published in the May 1st problem of the Journal of Clinical Oncology.

Thirty-one of these sufferers developed tumor relapse in less than 3 years, while 43 patients remained disease-free for more than three years after medical procedures. Armed with this provided information, two methods were used to identify the genetic markers that may best discriminate between these two groups of patients, reaching the final 23-gene combination ultimately. Additional studies will be needed, Atkins cautions, but if validated this prognostic marker could possess broad implications, including, possibly providing assistance in recommending adjuvant chemotherapy for several Dukes’ B sufferers. Furthermore, the ability to stratify this patient class into different risk groups could be a useful tool for aiding the development of new, targeted therapies for the disease.There are no criteria on normal levels for specific age groups. It’s just been assumed that the standard range for teenagers applies to older men, too, Anawalt said. Also, FDA research has discovered that many men don’t have any testosterone screening done before obtaining a prescription for supplements. And while it is not very clear if testosterone is dangerous for men’s hearts, additionally, there is little evidence that it benefits their well-being, Nguyen pointed out. The recent study that found no ill effects on men’s heart arteries also found no improvement in sexual function. Anawalt said that for guys with medical ailments that limit testosterone production, it’s pretty clear that supplements are a good idea. The question remains, he said, what now ? with the much bigger group of men who have ‘low T’ linked to aging? Predicated on what’s known, Anawalt said, supplements are unlikely to accomplish much for most men whose testosterone dips solely due to age..