Former U.S. President Joe Biden has been diagnosed with an "aggressive form" of prostate cancer that has spread to his bones, his office said in a statement on Sunday.

One usual method would be to do a PSA test. Alternatively, he could have a new urine test that looks for genetic signals of cancer. Doctors could examine Mr. Biden’s prostate with an MRI, or ultrasound. “Ultimately, if they think this nodule is prostate cancer, the final step would be a biopsy,” Dr. Moul said.