Does the character of the hospital of primary management influence outcomes in patients treated for presumed early stage endometrial cancer and atypical endometrial hyperplasia: a comparison of outcomes from a cancer unit and cancer centre.

A retrospective study from 2015 to 2020 comparing overall survival (OS) outcomes of a cancer unit and centre for presumed early stage endometrial cancers is presented. Cancer centres manage these presumed early endometrial cancer (EC) in situations of complex co-morbidities, surgical challenges as well as their own local unit patients. Our analysis compares 138 patients at KMH (unit) and 282 patients at RDH (centre) on OS, patient demographics, grading histology and final histology. Patients with presumed early stage EC can be reassured regarding no difference in OS between the cancer unit and centre management (p = .05). However, rates of minimal access surgery were higher at the cancer centre compared to the unit (93.2% versus 68.1%). The rates of upstaged disease were 4% and 8.8% at the cancer unit and centre respectively (p = .096). Sentinel node biopsy and genomic assessment may change future thresholds for centre-level management due to rates of upstaged disease.Impact StatementWhat is already known on this subject? Presumed lower risk endometrial cancers (endometrioid grades 1 and 2) have a rate of occult nodal involvement of only 1.4%. The BGCS does not recommend lymphadenectomy for low-risk endometrial cancers. These low-risk endometrial cancers should be managed with a hysterectomy and bilateral salpingo-ophrectomy via minimal access surgery. In view of the low rates of occult nodal involvement in low-risk endometrial cancer, surgery can be offered at a cancer unit.What do the results of this study add? Our study demonstrates there is no disadvantage in overall survival in the surgical management of presumed low-risk endometrial cancers at cancer units and centres. However, cancer centres have higher rates of minimal access to surgery despite managing a more elderly population. Our rates of upstaged disease of 4% and 8.8% at the cancer unit and centre indicate a potential benefit of pelvic lymph node assessment.What are the implications of these findings for clinical practice and/or further research? Sentinel lymph node biopsy does not have the surgical morbidity associated with systematic lymph node dissection. Therefore, when applied to presumed early stage endometrial cancer, there are potential changes in the threshold for centre-level management to improve overall survival.