Identification of a preoperative predictive factor for lymph node metastasis in uterine papillary serous carcinoma: long-term results from a single institution.
OBJECTIVE
The purpose of this study was to identify preoperative clinicopathological predictive factors for lymph node (LN) metastasis in women diagnosed with uterine papillary serous carcinoma (UPSC).


METHODS
Women diagnosed with UPSC in our institution from 1997 to 2012 were identified. All patients underwent hysterectomy and bilateral salpingo-oophorectomy plus pelvic and/or para-aortic lymphadenectomy. The predictive values of the risk factors for LN metastasis were analyzed using χ and multivariate logistic regression analyses.


RESULTS
A total of 94 patients met our study criteria. A CA-125 cutoff of 47.5 IU/mL on the receiver operating characteristic curve provided the best sensitivity and specificity (56.5% vs 90.1%, respectively) for LN metastasis prediction. The sensitivities and specificities of old age (≥60 years), body mass index of 25 kg/m or greater, deep myometrial invasion, tumor size greater than 2 cm, tumor size greater than 4 cm, preoperative CA-125 greater than 47.5 IU/mL, LN metastasis on imaging, and extrauterine spread on imaging for the presence of a positive LN were 39.1%, 34.8%, 30.4%, 34.8%, 21.7%, 56.5%, 43.5%, and 52.2%, and 52.1%, 45.1%, 78.9%, 57.7%, 83.1%, 90.1%, 93.0%, and 90.1%, respectively. Preoperative CA-125 (P < 0.001), LN metastasis on preoperative imaging (P < 0.001), and extrauterine spread on preoperative imaging (P = 0.009) were risk factors for LN metastasis on univariate analysis. Multivariate analysis revealed that preoperative CA-125 (P = 0.001) was the only independent risk factor for LN metastasis.


CONCLUSIONS
Preoperative CA-125 is a preoperative predictive factor for LN metastasis in UPSC.