A Risk Scoring System to Determine Recurrence in Early-Stage Type 1 Endometrial Cancer: A French Multicentre Study

To develop a risk scoring system (RSS) to determine recurrence in women with early-stage type 1 endometrial cancer (EC). Data of 396 women with early-stage type 1 EC who received primary surgical treatment between January 2001 and December 2012 were abstracted from multicentre database (training set). A risk model for predicting recurrence was developed and internally validated with the bootstrap technique. The RSS was externally validated using data from an independent population. Overall, the recurrence rate was 12.1 %. The median follow-up and initial time to recurrence were 34 (range 1-152) and 26 (range 1-151) months, respectively. Recurrence was associated with five variables: age a parts per thousand yen60 years, histological grade III, primary tumor diameter > 2 cm, depth of myometrial invasion a parts per thousand yen50 %, and the positive lymphovascular space involvement status. These variables were included in the RSS and assigned scores. A total score of 6.5 points corresponded to the optimal threshold of the RSS. For women with a score < 6.5 or a parts per thousand yen6.5, the recurrence rates were 8.4 % (30/357) and 48.7 % (19/39) in the training set, respectively. At this threshold, the diagnostic accuracy of the RSS was 87 %. Areas under the curve of the receiver-operating characteristics for predicting recurrence at internal and external validation were 0.74 [95 % confidence interval (CI) 0.71-0.77] and 0.82 (95 % CI 79-85), respectively. This RSS identified two subsets of women with low and high risk of recurrence among women with early-stage type 1 EC. It could be helpful to better define indications for nodal staging and adjuvant therapy.