Sen. McCaskill back to work after cancer treatment

JEFFERSON CITY, Mo. -- U.S. Sen. Claire McCaskill said she's returning to work after breast-cancer treatment.

The Democratic senator said Monday she has received a good prognosis.

She spent three weeks in St. Louis for treatment, including surgery to remove a lump and some tissue.

McCaskill said the cancer was detected early.

She said the treatment provided "a really good time for me to refocus on some of the things that are really important in life."

She said she spent a lot of time with her husband and did a lot of reading.

McCaskill is backing former Secretary of State Hillary Clinton in Missouri's Democratic presidential primary today. McCaskill said the cancer treatment prevented her from actively campaigning on Clinton's behalf.