Table 2. Geographical origin of data used for the 7^th and the 8^th editions of the TNM classification of lung cancer.

Geographical origin	Number*
	7th edition	8th edition
Europe	58,701	46,560
North America	21,130	4,660
Asia	11,622	41,705
Australia	9,416	1,593
South America	0	190
Total	100,869	94,708

*, total number of submitted patients; TNM, tumor, node and metastasis.