The identification of preoperative and postoperative clinical and pathological features that prelude a higher risk for the appearance of LRs and/or SPTs may be of potential interest in determining which patients should benefit of a closer regular follow-up. When considering together the whole clinical and pathological features, only postoperative RT and bone involvement were predictive for the development of LRs. Because of the poor survival rate of the affected patients, we strongly recommend aggressive surgical treatment following the appearance of an SPT or LR.

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4/5.

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