Emergent radiotherapy for pelvic malignancies: a narrative review.

BACKGROUND AND OBJECTIVE:Patients with primary genitourinary (GU), gynecologic (GYN) and gastrointestinal (GI) cancers can develop life-threatening or critical function-threatening symptoms that necessitate emergent intervention with palliative radiotherapy (RT). Unfortunately, research describing the use of RT in this critical setting is lacking. We aimed to review literature describing emergent palliative RT for primary pelvic malignancies and provide a narrative synthesis of relevant studies. METHODS:A medical librarian searched Ovid MEDLINE, Embase Classic, and Embase databases for relevant English language references from 1946-2022. No restrictions were placed on study type, publication type or date. References for GU, GYN and GI cancers were grouped and synthesized separately. KEY CONTENT AND FINDINGS:The treatment of bleeding from primary pelvic tumors was the only indication for emergent RT identified, however, no references reported dedicated cohorts of patients treated for bleeding in the emergent setting. Most references were retrospective single institution studies describing various dose fractionation schemes for non-emergent palliative RT. Outcome measures and response assessment times varied. The latency to hemostasis after RT commencement was not well described; most studies reported outcomes captured weeks or months following treatment. In general, high rates of hemostasis for GU, GYN and GI tumors have been reported following RT schedules ranging from a single fraction to many weeks of fractionated treatments. Bleeding seems to respond more favorably than other symptoms including pain and obstruction. CONCLUSIONS:Managing bleeding was the only indication for emergent RT identified in our search. Scant data exist that describe the latency to a hemostatic response following RT. This is an important knowledge gap in the literature given how commonly patients are affected by this complication of primary pelvic malignancies.