Thyroid gland clonality revisited: the embryonal patch size of the normal human thyroid gland is very large, suggesting X-chromosome inactivation tumor clonality studies of thyroid tumors have to be interpreted with caution.

Abstract excerpt

It is widely assumed thyroid carcinomas, adenomas, and many hyperplastic nodules are monoclonal. This belief is based on X-chromosome inactivation analyses of thyroid tumors. However, X-chromosome inactivation studies of tumors are informative only when interpreted in the context of the clonal composition of the surrounding normal tissue, and in the case of thyroid tissue, such analyses have never been...

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