Trump's Chief of Staff Susie Wiles and what to know about her diagnosis

White House Chief of Staff\u00a0Susie Wiles\u00a0has been diagnosed with \

White House Chief of Staff Susie Wiles has been diagnosed with "early-stage breast cancer," President Donald Trump announced on Monday, March 16.

"(She) has decided to take on this challenge, IMMEDIATELY, as opposed to waiting. She has a fantastic medical team, and her prognosis is excellent," Trump said in a post on the social platform Truth Social. "During the treatment period, she will be spending virtually full time at the White House."

Finding breast cancer early is one of the best ways to prevent death from the disease, according to the American Cancer Society.

"If breast cancer is found early, when it’s small and has not spread, it is easier to treat successfully," the organization notes. "Getting regular screening tests is the most reliable way to find breast cancer early."

It is unclear what specfically Wiles has, but a common form of early-stage breast cancer is ductal carcinoma in situ, or DCIS, which affects the cells lining the milk duct. Often called “stage-zero breast cancer” or “precancer," DCIS doesn't spread outside the breast.