WASHINGTON, May 20 (Reuters) - Former U.S. President Joe Biden had not received a test for prostate cancer, known as a PSA, for more than a decade before he was diagnosed with an advanced form of the disease last week, a spokesperson said on Tuesday.

The latest comments from the former Democratic president’s camp come amid questions from Republicans and some health professionals about why his cancer was not caught before reaching an advanced stage.

Biden, 82, has also faced broader questions about whether he and his allies withheld critical information from the American public about his ability to serve in the White House. A new book, “Original Sin,” details widespread concerns about Biden’s mental acuity among aides as he pursued reelection last year.

“President Biden’s last known PSA was in 2014,” the Biden spokesperson said on Tuesday. “Prior to Friday, President Biden had never been diagnosed with prostate cancer.”

A PSA test, or prostate-specific antigen test, is a blood test that is used to screen for prostate cancer.