Based on the assertions of the new book, the Queen fought cancer in secret and had THIS reaction to Harry’s Oprah interview:

Upon her death on September 8th, Queen Elizabeth II had reigned for more
than 70 years. A new biography of Britain’s late Queen Elizabeth II alleges
that she quietly battled cancer until her death at 96. The author, Gyles
Brandreth, reveals some other shocking information about the royal family
in his book Elizabeth: An Intimate Portrait.