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Olivia Newton-John, who played Sandy in 'Grease,' was diagnosed with breast cancer in 1992, around the same time her father died of liver cancer, according to the website of her organization, the Olivia Newton-John Cancer and Wellness Centre in Melbourne. She underwent a partial mastectomy and had breast reconstruction surgery.
(Pictured: Olivia Newton-John appears in a scene from 'Glee' in 2010.)
(Photo courtesy of FOX)