Recurrent undifferentiated embryonal sarcoma of the liver in adult patient treated by pembrolizumab:

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BACKGROUND Undifferentiated embryonal sarcoma of the liver(UESL)is a neoplasm that rarely develops in adults.The main treatments for UESL are upfront gross total surgical resection and adjuvant multiagent chemotherapy.Here,we report a case of recurrent UE
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