Girls Aloud reunited in memory of their late bandmate Sarah Harding who died last year after being diagnosed with breast cancer.
Nicola Roberts, Kimberley Walsh, Nadine Coyle and Cheryl Tweedy teamed up with Cancer Research to host a special charity event on Sunday called Race for Life for Sarah. In her book, Sarah revealed her experiences after she was diagnosed with the disease, including the first signs she spotted.
Here is what Sarah said about breast cancer and the other symptoms that are important to look out for. We have also given advice from the NHS.
