The text claims King Charles has cancer.

The claim that King Charles has cancer is supported by multiple sources. A Snopes fact-check rated the specific claim about his involvement in a specific cancer therapy as 'Unproven', while PolitiFact rated another related claim as 'False'. However, web evidence from sources like the BBC and Town & Country confirms that King Charles has been diagnosed with a type of cancer, although specifics are undisclosed. Buckingham Palace confirmed the diagnosis, and there are reports about his treatment being reduced. Thus, the claim that he has cancer itself is largely substantiated by reliable media sources.