LONDON -- British artist Tracey Emin says she was diagnosed with cancer earlier this year and is in remission after an operation.In an interview published Wednesday, Emin told the website Artnet that a malignant tumor was discovered on her bladder in the spring.She said she had surgery in the summer in which many of her reproductive organs were removed and she was fitted with a stoma bag.The 57-year-old artist said that at the time the tumor was discovered, she was working on a painting of a