Kate Middleton shocked the world when she revealed she was diagnosed with cancer. Kensignton Palace announced that the Princess of Wales was undergoing “preventive chemotherapy treatment.” She learned of her diagnosis in January, after having abdominal surgery.“My medical team therefore advised that I should undergo a course of preventive chemotherapy and I am now in the early stages of that treatment,” said Kate in the statement. Here’s what we know about her medical condition:The Princess of Wales reveals she is undergoing preventative chemotherapyKing Charles has become one of Kate Middleton’s greatest sources of supportPreventative chemotherapy, also known as adjuvant therapy, is the process that kills “microscopic cancer cells that can’t be detected and may not have been destroyed during the first round of treatment,” explains USA Today.According to the publication, this treatment is used on colon, breast, and lung cancer, although it’s being studied to prevent other forms as well.