President Joe Biden's last known prostate-specific antigen (PSA) test was in 2014, as questions rise about how much his cancer has spread and why it wasn't caught earlier.&nbsp;

"President Biden's last known PSA was in 2014. Prior to Friday, President Biden had never been diagnosed with prostate cancer," a Biden spokesperson told Fox News.&nbsp;

The PSA test is a blood test used primarily to screen for prostate cancer. The test measures the amount of prostate-specific antigen (PSA) in the blood, according to the Mayo Clinic.&nbsp;

PSA is a protein produced by both cancerous and noncancerous tissue in the prostate, a small gland that sits below the bladder in males.

The former president’s prostate cancer has been characterized by a Gleason score of 9 (grade group 5) with "metastasis to the bone."

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<div class="author-bio">Louis Casiano is a reporter for Fox News Digital. Story tips can be sent to&nbsp;<a href="mailto:louis.casiano@fox.com" rel="nofollow">louis.casiano@fox.com</a>.</div>

Questions arise about President Biden's prostate cancer as his last PSA test was in 2014. The cancer, with a Gleason score of 9, has metastasized to the bone.{ai:summary}President Biden's last PSA test occurred in 2014, raising concerns about the spread of his recently diagnosed prostate cancer. His cancer has a Gleason score of 9, indicating a high grade, and has metastasized to the bone.The lack of recent screening raises questions about earlier detection. #health

Biden's 'last known' prostate cancer screening was over a decade ago, as questions mount over diagnosis

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