Small tumors are good, or good tumors are small?

The above is an abbreviation of the title of a New England Journal of Medicine (N Engl J Med 2017; 376:2286-91), in this article, the authors discuss identification of a group of tumors that are composed of predominantly overdiagnosed tumors. In order to be clear, I have to start with few definitions.

Overdiagnosis refer to tumors dectected on screening that never would have led to clinical symptoms.

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