I had prostate cancer about 10 years ago, and it was discovered at a very early stage because my primary care physician routinely checked my PSA reading along with my regular bloodwork every other year, and when the reading started elevatring, I was referred to a urologist who arranged for radiation treatments.
The radiastion totally eliminated the cancer, and every year since then, my PSA reading has been very low -- in the range of 0.14 to 0.26. But if it hadn't been caught early, I would likely have had a major problem.
There are reports that Biden was found to have an enlarged prostate in 2019, and I'd consider it malpractice if White House physicians didn't insist on a PSA test for Biden at that time. To not have administered a PSA test to Biden since 2014 is absurd, no matter what the cost!