In March 2024, Princess Kate announced her cancer diagnosis to the world. Revealing that she was undergoing chemotherapy for prevention, Kate said in a video released on X, "It has been an incredibly hard few months for our whole family." She continued, "My condition (in January) was thought to be cancer-free.... But after my surgery, tests revealed cancer."

She continued.

While promoting her new book, A Biography of the Future Queen: A Biography of the Future Queen), author Robert Jobson spoke to Us Weekly about Prince William's reaction to his wife's diagnosis. It was "devastating for him," Jobson explained. The royal expert also described Prince William as "completely despondent," especially since his father, Charles III, had also recently been diagnosed with cancer.

Elaborating on William's potential reaction to learning that Queen Kate had cancer, Jobson suggested that the prince had "a lump in his throat" and that his "stomach was empty. 'It made him wobble,' Jobson explained. There is no doubt about that."

Jobson suggested that Princess Kate and King Charles had urged Prince William to lead the royal family during a difficult time. According to Jobson, Princess Kate and Prince Charles told Prince William that.

William's workload reportedly increased as both Princess Kate and King Charles reduced their official duties. But according to Jobson, Kate continued to support her husband even as he became the face of the royal family." (Kate) was good at making sure that happened," Jobson told the magazine." She showed him that she was there for him as much as he was there for her."

In a "Hello!" magazine, Jobson also spoke about Kate's approach to parenting, especially in light of her recent diagnosis. He explained, "Kate made it very clear to her children, both to the late Queen and to the Prince of Wales [now King], that she would not be rushed into doing something she didn't necessarily want to do." It is a very brave thing to do, because you are in a very different world. But I think she realizes that she only has one chance. She has three young children.