Princess Catherine's video message: What is known about Kate's cancer. With her video message, Princess Catherine ends the speculation about her health.
Why are the royals only making this public now? And what's next for Britain's future queen? The overview. Kate talks in her video about being diagnosed with cancer during tests following her surgery. Kate said she is preventive chemotherapy and the early stages of treatment. The therapy began at the end of February - how long it will last is unknown.