Colon cancer will be blood tests and recurring colonoscopies. Standard offering fro everyone above, I think, 50 or 55 in germany. Earlier, if there is family history. In that case, you can start as early as 10 years before the age the close relaive was diagnosed. Which means my children will have their first tests aged 16. Pretty cool, because polyps are easy to remove, ideally before they become cancerous.