Tony,
As I understand it, the second choice is the "thrice in a lifetime" screening policy recently advocated by MSK and summarized below:
MSKCC PSA Screening Guidelinesmen 45-49 screened:
if PSA<1 --> advised to repeat test in early 50s and at age 60
if PSA=1-3 --> advised to repeat test every 2-4 years
if PSA>3 --> discuss biopsy
men 50-59 screened:
if PSA<1 --> repeat test at age 60
if PSA=1-3 --> advised to repeat test every 2-4 years
if PSA>3 --> discuss biopsy
men 60-70 screened:
if PSA<1 --> end all screening
if PSA=1-3 --> advised to repeat test every 2-4 years
if PSA>3 --> discuss biopsy
men 71-75:
shared decision-making on whether to screen
men 76+: no screening
Their guidelines are based on a nested case-control analysis of the Malmö, Sweden cohort who gave blood samples at the start. For nerds like me who want to read their analysis, here are the links:
Strategy for detection of prostate cancer based on relation between prostate specific antigen at age 40-55 and long term risk of metastasis: case-control study
Prostate specific antigen concentration at age 60 and death or metastasis from prostate cancer: case-control studyThe authors found that men in the 45-49 age group who had PSA in the top quartile had a .7% risk of developing a metastasis in 15 years, and a .3% risk of death from PC in that time. And those with PSAs in the highest 10% (>1.6), had a 1.6% risk of 15-yr metastasis and .7% risk of 15-yr death from PC (Tables 2 & 3). It is based on these levels that the authors recommend screening. There is no discussion of whether a later screening would have picked it up, and most importantly, whether such screening would have reduced their mortality: In the PIVOT trial, after 12 years of follow up, there was no significant difference in PC mortality whether they were surgically treated or observed after a median of ten years, and it did not differ by age group. The harms associated with screening this age group is also not discussed. Their strategy also carries the risks of many unnecessary biopsies.
Case control studies like this are considered weak evidence because of its retrospective nature. It represents a conjecture on their part of what might have happened had their strategy been followed. The only real way to know is with a randomized controlled prospective study. This was what was done in the
ERSPC trial. Unfortunately that study did not include this younger age group; the men in the study were all 55-69. However, since ERSPC after 11 years has found no benefit to screening this older age group in which we know PC incidence and aggressiveness is higher, it would be hard to imagine that screening would benefit younger men. On the other hand, the harms are well known.
The AUA Guidelines are not the last word. As ERSPC data matures, it may very well turn out that there will be a more significant benefit to screening that may only emerge after 20 years or 30 years. After 14 years, there seems to be some divergence in PC mortality between those who were screened and those who weren't, and if the gap widens, the conclusions may be different. But no one has a crystal ball. Based on what is known right now, the AUA guidelines - recommending non-routinized testing and discussions with urologists prior to making the decision to test seems prudent. It represents a middle ground between the runaway routinized testing that has caused so much harm, and the USPSTF recommendation to never screen.