"It has been an intense journey but I am feeling great and ready to start the next chapter."
The star went on to praise Breast Cancer Awareness Month, explaining it gives hope to many women all over the world.
"Early detection has saved my life twice. I will continue to battle and lend my voice in any way I can," she said.
Anastacia was first diagnosed with breast cancer in 2003 after it was found during a routine mammogram before her planned breast reduction surgery. She had a partial mastectomy and six weeks of radiotherapy.
In February this year she was forced to cancel tour dates after finding her cancer had returned.
The star has previously spoken of her battle, admitting she wonders whether her intense work schedule made her more susceptible to the disease.
Actress Angelina Jolie announced she had undergone a double mastectomy earlier this year after discovering she was genetically predisposed to cancer. TV personality Sharon Osbourne has also had the operation.
- Cover Media