In February 2009, Fiorina was diagnosed with stage II breast cancer. She underwent a double mastectomy at Stanford Hospital in March 2009, followed by chemotherapy, which caused her to temporarily lose her hair, and later radiation therapy. She was given "an excellent prognosis for a full recovery." In late 2009, during her campaign for the United States Senate seat held by Barbara Boxer, Fiorina humorously told a group of supporters: "I have to say that after chemotherapy, Barbara Boxer just isn't that scary anymore."