White House chief of staff Susie Wiles said Monday that she has been diagnosed with breast cancer, which was detected early, and that she will continue to serve in her role while she undergoes treatment.

“I am grateful to have an outstanding team of doctors who detected the cancer early and are guiding my care, and I am encouraged by a strong prognosis,” Wiles said in a statement. “I am also deeply thankful for the support and encouragement of President Trump as I undergo treatment and continue serving in my role as White House Chief of Staff.”

President Donald Trump said in a social media post Monday that while Wiles undergoes treatment, “she will be spending virtually full time at the White House, which makes me, as President, very happy!”

During an event at the White House on Monday, Trump praised his top aide, saying that she is an “amazing fighter” and will “take care of it immediately,” referring to her treatment.

“She just started actually, and she’s going to be a great shape,” Trump said of her treatment. “The prognosis there is excellent, beyond excellent.”

Wiles has served as the White House chief of staff since the beginning of Trump’s second term.

She didn’t offer any additional details about her prognosis or treatment plan.

Breast cancer is the most common type of cancer in women in the United States (excluding skin cancers). About 1 in 8 women will develop breast cancer. 

An estimated 321,910 females will be diagnosed with breast cancer this year, the American Cancer Society estimates. An estimated 42,140 women will die.