351 Substantial lymph-vascular space invasion (LVSI) as predictor of distant relapse and poor prognosis in low-risk early stage endometrial cancer

Objective To evaluate the prognostic role of LVSI, evaluated in a semi-quantitative fashion on prognosis of early stage, low risk endometrial cancer (EC). Methods We enrolled patients who underwent surgery for EC between 2003 and 2018 in two referral cancer center. All patients had endometrioid EC, G1-G2, with myometrial invasion Results Among 524 patients, any positive LVSI was found in 57 patients (10.9%) with 6.7% (n=35) focal LVSI and 4.2% (n=22) substantial LVSI. Substantial LVSI was associated to higher rate of G2 (p Conclusions Substantial LVSI represents the strongest independent risk factor for decreased survival and distant relapse, indicating a role for potential hematogenous dissemination.