The first all-Ireland cancer atlas will be published today.
It shows major unexplained variations across the island in the risk of most common cancers.
Findings include one that shows that the risk of lung cancer is higher in urban areas, with Derry one of a number singled out.
Bowel cancer is more common around Cork city, and in a band from Donegal into the North. There is also a high prevalence of stomach cancer in a band stretching from Dublin to Donegal.
Dr Harry Comber is head of the National Cancer Registry.........