Is there a benefit to EBRT for recurrent solitary fibrous tumor/ hemangiopericytoma in patient with multiple sites of intrapelvic recurrence?

Thank you for this question. Solitary fibrous tumors, as you know, are quite rare and the mainstay of treatment is surgery if feasible. The role of adjuvant (or definitive) radiation and/or chemotherapy has been used sporadically and thus has not been well established.

In this case, if there are a re...