neoplasm
• when mice older than 6 weeks are given systemic tamoxifen treatment by intraperitoneal delivery, mice develop multiple tumors at clinically relevant sites with a median tumor free survival of 153 days (longer latency than Pax7CE mutants
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• tamoxifen treated mice develop sarcomas that are exclusively undifferentiated pleomorphic sarcomas (UPS), myogenic or nonmyogenic in type
• tumors can appear in the body wall, the extremities, or the head and neck region
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