ATLANTA — Georgia Gov. Nathan Deal’s wife announced Monday that she had surgery to remove a tumor after being diagnosed with breast cancer.

A press release issued by the governor’s office said first lady Sandra Deal was diagnosed with stage one breast cancer during an annual mammogram. It said the tumor was removed successfully and she would undergo chemotherapy treatment in the coming weeks.

“Since I caught it in its early stages, I am confident that the chemotherapy will yield successful results,” Sandra Deal said in a statement. The 75-year-old first lady encouraged all women to be proactive about their health and get an annual mammogram.

Sandra Deal has been married to the governor for more than 50 years. They have four children and six grandchildren.

The first lady, a former schoolteacher, has used her time in the governor’s mansion to champion education and literacy causes. Since her husband took office, she has read to children in schools and pre-kindergarten programs in all of Georgia’s 159 counties, according to the governor’s office.