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The 55-year-old former chief executive of Hewlett-Packard Co. had a double mastectomy and underwent chemotherapy and radiation after she was diagnosed with breast cancer in February 2009. She completed those treatments in October.

Miss Bowker said Mrs. Fiorina is looking forward to getting back on the campaign trail. Mrs. Fiorina is trying to unseat three-term Democratic Sen. Barbara Boxer in California this fall.

TREASURY

Interest rates mixed at weekly auction

Interest rates on 3-month Treasury bills rose to their highest level since April, while rates dipped on 6-month bills in Tuesday’s auction.

The Treasury Department auctioned $30 billion in three-month bills at a discount rate of 0.165 percent, up from 0.160 percent last week. Another $30 billion in six-month bills was auctioned at a discount rate of 0.205 percent, down from 0.215 percent last week.

The three-month rate was the highest since three-month bills averaged 0.175 percent on April 5. The six-month rate was the lowest since those bills averaged 0.170 percent on June 21.

The discount rates reflect that the bills sell for less than face value. For a $10,000 bill, the three-month price was $9,995.83 while a six-month bill sold for $9,989.64. That would equal an annualized rate of 0.167 percent for the three-month bills and 0.208 percent for the six-month bills.

From wire dispatches and staff reports