You have not presented any evidence to back that assertion. Nor could you. Health records are private.
Additionally, as others have pointed already out, PSA tests are normally not done after age 70.
"...medical experts point to guidelines that advise against P.S.A. screening for men over the age of 70. The guidelines vary slightly across different medical organizations, but
doctors generally agree that men of an advanced age should not automatically be screened for prostate cancer."
Biden's spokesman noted yesterday:
"...Mr. Biden’s last-known prostate-specific antigen test, the most common way to screen for prostate cancer, was in 2014. Mr. Biden would have been 71 or 72 years old at the time."
So it's entirely possible for bone cancer to have developed in that time period.