To analyze the association between posttreatment squamous cell carcinoma antigen (SCC Ag) and treatment failure in patients with cervical SCC treated with concurrent chemoradiotherapy (CCRT).
We reviewed patients with cervical SCC who were treated with definitive radiotherapy or CCRT between June 2012 and May 2015 at our institute. A receiver operating characteristic (ROC) curve was used to analyze the cutoff value of posttreatment SCC Ag in predicting treatment failure. Log-rank tests and Cox proportional hazards models were used to identify whether posttreatment SCC Ag was significant in predicting disease-free survival (DFS).
A total of 559 patients were included in this study. With the ROC curve, the optimal cutoff posttreatment SCC Ag level was 1.8 ng/mL (sensitivity 27.1%, specificity 96.6%). A posttreatment SCC Ag level ≥ 1.8 ng/mL was observed in 47 patients. The multivariate analysis showed that posttreatment SCC Ag (hazard ratio 5.10; 95% confidence interval, 3.31-7.88; p < 0.001) was an independent prognostic factor of DFS. The 3-year overall survival (OS), DFS, local control, and distant control rates of patients with posttreatmentSCC Ag < 1.8 ng/mL and ≥1.8 ng/mL were 90.7% and 46.4% (p < 0.001), 84.8% and 31.9% (p < 0.001), 81.4% and 69.5% (p < 0.001), and 90.4% and 54.1% (p < 0.001), respectively.
Patients with posttreatment SCC Ag ≥ 1.8 ng/mL suffer due to a high rate of treatment failure and poor survival.