Many different tumor types have polyclonal tumor origin: evidence and implications.

Abstract excerpt

Few ideas have gained such strong acceptance in the scientific community as the monoclonal origin of tumors; the idea that tumors start with a single mutated cell (or a single clone of cells) that go on to accumulate additional mutations as a tumor develops. The certainty with which this concept is held by the scientific community reflects the length of time it has been unchallenged and the experimental...

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