The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

General Information

Added text on levels of evidence, a formal ranking system to help the reader judge the strength of evidence linked to the reported results of a therapeutic strategy.

Added text to state that well-characterized cases of Ewing family of tumors in neonates and infants have been described (cited Kim et al. as reference 6).

Stage Information

Added Gerth et al. as reference 3.

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