Mammary‐analog secretory carcinoma in children: Surgery or TRK inhibitors first?

Abstract

AbstractWe report two cases of pediatric mammary‐analog secretory carcinoma (MASC), a male operated on at age 8 and a female operated on at 12, who are in remission 2 years after surgery. The diagnosis of MASC was challenging and established by identifying theETV6::NTRK3fusion transcript in both cases. Given the excellent results of TRK inhibitor treatments in adult MASC and pediatric tumors expressing anETV6::NTRK3fusion, they should probably be prescribed as first‐line treatment in cases requiring surgery with foreseeable serious sequelae or metastatic disease.