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Marked Response to Larotrectinib in Pelvic Spindle Cell Sarcoma With Concurrent TPM3-NTRK1 Fusion and CDK4/MDM2 Amplification: A Case Report
Primary pelvic sarcoma is rare and often involves adjacent organs including rectum and urinary bladder because of the anatomic constraints of the pelvis. This may impede the attempts to achieve wide excision with tumor-free margins. Here, we reported that perioperative targeted therapy against tyrosine receptor kinase is a promising therapeutic approach to significantly improve surgical outcomes in huge pelvic spindle cell sarcoma with neurotrophic tyrosine receptor kinase (NTRK) gene fusion.