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a Distribution of T classification in the 6th and 7th edition AJCC staging system (n = 2,196). In the 7th edition staging system, former category T1 is divided into new categories T1a and T1b, whereas other T categories are redefined. b Distribution of N classification in the 6th and 7th edition AJCC staging systems (n = 2,196). In the 7th edition staging system, former category N1 is divided into new categories N1 and N2, and category N3 is redefined
