In 2022 Joe Biden Announced He Had Cancer. In 2025, Three Years Later, His Office Announced It Too.

And in the entire period between, mainstream media and the Democrat Party denied it. - Jupplandia
Biden’s cancer was only very recently discovered “was diagnosed on Friday”. 

Referring only to this very recent diagnosis strongly implies that the cancer was previously undetected. This is deliberate, of course...
You aren’t supposed to notice the glaringly obvious pattern of total media dishonesty here...
But here is the wider context that pertains to Joe Biden or any other POTUS, which exists in four parts:

• 1/ The medical attention given to a US President is not the same as that given to the average citizen. A President’s health is under intense expert scrutiny. Presidents receive very extensive and regular medical check ups. They have immediate access to the very best doctors in the US...

Here is a comment reflecting a urologists view of how likely it is that Biden’s cancer has only just been discovered: