Sarah Harding has given fans an update on her "tough" battle with breast cancer.The 39 year old, who announced last August the devastating news that she was diagnosed with advanced cancer, took to her Instagram feed to tell her 235,000 followers about an autobiography she's been working on during her treatment.The star posted two snaps on her social media feed, one of her as a child sleeping on a couch and another of the front cover her book, revealing the title to be Hear Me Out.
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