What to know

• The 69-year-old White House chief of staff is a powerful figure and particularly close to the US president.S1
• White House chief of staff Susie Wiles announced Wednesday that she is now cancer-free after being diagnosed with breast cancer in March.S2
• White House chief of staff Susie Wiles had a medical procedure at the Mayo Clinic earlier this week, CBS News first reported.S3
• Wiles shared in March that she had been diagnosed with early-stage breast cancer.S4
• White House chief of staff Susie Wiles was diagnosed with breast cancer in March.S5