In the first official video of Princess Kate since her abdominal surgery in January, the royal revealed that she has been diagnosed with cancer.

“In January, I underwent major abdominal surgery in London, and at the time, it was thought that my condition was noncancerous,” she said in the clip, posted today to social media accounts for the Prince and Princess of Wales. “The surgery was successful; however, tests after the operation found cancer had been present. My medical team therefore advised that I should undergo a course of preventative chemotherapy, and I am now in the early stages of that treatment.”