Olivia Newton-John has recalled the heartbreaking moment she was diagnosed with stage four metastatic breast cancer. In a new Instagram video to promote her new foundation, the Grease actress, 72, told fans she hoped that her story will help other cancer sufferers.MORE: Olivia Newton-John enjoys surprise evening with Oprah and Gayle King amid cancer battle"I am probably one of those people who is living beyond cancer, living beyond probably what people expected to happen," she explained.