Targeted Therapy in a Young Adult With a Novel Epithelioid Tumor Driven by a PRRC2B-ALK Fusion.

ABSTRACT

This case report describes an 18-year-old woman with an unusual epithelioid tumor of the omentum with a novel PRRC2B-ALK fusion. Although the atypical pathologic features raised significant diagnostic challenges, expression of CD30 on tumor cells and detection of an ALK rearrangement provided critical information for selecting targeted therapy in a patient not suitable for surgical resection. Despite an initially promising therapeutic response, the patient died. The efficacy of treatment was confirmed by the lack of viable tumor cells at autopsy. This case highlights the role of timely targeted therapy in patients with rare tumors and novel actionable molecular targets.