New Delhi, May 20 -- Britain's King Charles penned a personal note for former US President Joe Biden after the news of his cancer diagnosis.

According to the PEOPLE's report, Buckingham Palace confirmed that the King, who himself is undergoing treatment for an undisclosed type of cancer, personally penned the message of support.

The contents of the letter remain private.

On Sunday, May 18, Joe Biden's office revealed that the former US president, 82, had been diagnosed with aggressive prostate cancer that has spread to his bones.

The diagnosis came after Joe Biden reported experiencing urinary symptoms, prompting doctors to conduct further tests, which revealed a concerning nodule on his prostate.

Biden's prostate cancer has been cla...