Britain's Princess Kate says she has completed chemotherapy and will be back on royal duty in the coming months. Kensington Palace released a rare inside look at Princess Kate's family life during her battle with cancer. Back in March, the princess announced her treatment without disclosing what type of cancer she has? Doctors did find it during a major abdominal surgery. Back in January, the princess says she and Prince William have been blown away by supportive messages from across the UK and around the world.