Chris Burton was planning his wedding when he noticed he was bleeding after going to the bathroom. He thought it was strange, but figured it was a one-off. Six weeks later, it happened again. His GP referred him for a colonoscopy, and Mr Burton arranged to have the procedure after he and his wife returned from their short honeymoon. By Norman Swan, Elise Potaka, Maddy King, Anushri Sood[abc.net] The 39-year-old had advanced bowel cancer. The test results stunned him. "That's probably similar to a lot of young people. Cancer's not at the forefront of what you think might be wrong with you," he says. Australians aged in their 30s and 40s are experiencing unprecedented and in some cases world-leading rates of at least 10 different types of cancer - and scientists are desperate to understand why. It's a question Mr Burton has struggled with since his diagnosis and one that's arrived at what should be a joyous time - the couple's about to...