Dr. Tewari, of the Dept. of Urology at New York-Presbyterian Hospital/Weill Cornell Medical Center, discusses PSA tests, the need to keep using them for now, and the need to find and use bio-markers as soon as they are available.

I think PSA can be wrong. Having said that, that's the best marker at this point we have. PSA raises the red flag when there is no cancer sometimes, and that may result in many more patients getting a biopsy when they don't actually have cancer. I hope that in the next five to ten years, all the research that is going on will result in a marker that will give us the same kind of a message but may be more accurate. Challenges are how to make this marker better or find a marker which is better than PSA, but until we find something better we are not going to abandon something which seems to be working well.