dr. kirsten bibbons domingo, a professor, doctor of medicine, epidemiology and statistics and also dr.ete carroll who chairs the urology department right here in san francisco. dr. carroll, let me start with you. obviously a lot of news about the psa test. the message people seem to be taking is that it could do more harm than good. and that really no one should be getting it on a regular basis. what do you say to that news, first of all, those recommendations? >> i think the first part may be accurate for some patients. i think the second part to abandon psa testing will set us back. we've seen a 40% reduction in prostate cancer mortality in the past two decades. i don't think we want to go backwards. i think ending psa testing completely is the wrong thing to do. >> reporter: in your practice, will you still order the test? >> yes. i'll order it in well-informed patients who are at risk for the disease. the other important thing is if they're found to have prostate cancer, we will treat selectively. that is that one of the big achilles heels of psa testing is that you identify some c