Princess of Wales shares message on World Cancer Day Catherine, Princess of Wales has posted a message on World Cancer Day. 4 February 2026 Catherine, Princess of Wales has shared a heartfelt message to commemorate World Cancer Day (04.02.26). Catherine, Princess of Wales has shared a message on social media The 44-year-old royal was diagnosed with cancer in early 2024, and after overcoming her health scare, the Princess has shared a message of support with other people going through similar struggles.