The tree maps for diagnosis show how many people have been diagnosed with a type of cancer compared with how many people have been diagnosed with other types of cancer. The larger the block, the greater the numbers for that cancer. For the risk factors, screening types, testing and hospital treatments the treemaps can be interpreted similarly. The survival treemaps show the number of people who have survived 5 years after their cancer diagnosis. Tree maps provide a method to identify the common cancer types and those that are less common.