Intraosseous Spindle Cell Rhabdomyosarcoma with <i>MEIS1</i> :: <i>NCOA2</i> Fusion – Case Report with Substantial Clinical Follow-up and Review of the Literature
Benjamin F. Smith, Yee-Cheen Doung, Brooke Beckett, Christopher L. Corless, Lara E. Davis, Jessica L. Davis
Abstract
Spindle cell/sclerosing rhabdomyosarcoma (SSRMS) is a clinicopathologically and molecularly heterogeneous disease. Gene fusions have been identified in intraosseous SSRMS, consisting predominantly of EWSR1/FUS::TFCP2 and MEIS1::NCOA2. The former often follow an aggressive clinical course; there is limited clinical follow-up available for the latter. We report here a new case of the very rare intraosseous SSRMS with MEIS1::NCOA2 gene fusion and include the detailed treatment course and 52 months of clinical follow-up. SSRMS with MEIS1::NCOA2 gene fusion appears biologically distinct from other intraosseous SSRMS, following a course characterized by local recurrence with rare reports of metastasis to date.