"I am incredibly grateful that my surgery went well Friday," Roberts said in a posting on ABC News' Web site. "Thanks for all the prayers — I owe you big time!"
Roberts, 46, told "GMA" viewers last Tuesday that she had cancer, which she discovered through self-examination.
Her mother and sisters traveled from the Mississippi Gulf Coast and New Orleans to be with her for the operation. The former college basketball star and sportscaster grew up in Pass Christian, Miss.
"My family read many of your e-mails while I was in surgery," said Roberts, who has been an anchor at "GMA" since 2005. "It brought them such comfort. My big sis, Sally-Ann, marked all the survivor stories with a big S."
She said her co-anchor, Diane Sawyer, visited her in the hospital.
"I woke up in the recovery room with sweet Diane gently tugging on my big toe," she said in a posting Monday. "As you can imagine, I am still quite sore from the procedure and need to take some time for my body to heal."
Roberts left the hospital on the day of her surgery.
"Right now the best medicine for me is to be at home surrounded by family and loved ones," she said. "I expect to get the final test results later this week, which will determine the course of my treatment."