| Summary: | To identify the prognostic factors for locally advanced cervical cancer patients treated by intensity-modulated radiotherapy (IMRT) and concurrent cisplatin-based chemotherapy.
Methods: A total of 125 patients with stage IB2–III cervical carcinoma were treated with IMRT and concurrent cisplatin-based chemotherapy, plus high dose rate (HDR) brachytherapy between January 2004 and November 2010, in our institution. All patients received external irradiation of 45–54 Gy with the IMRT technique and concurrent cisplatin-based chemotherapy monthly or weekly. HDR brachytherapy of 20–30.5 Gy was prescribed to point A, as a local boost. Prognostic factors including age, histology, stage, lymph nodes metastasis, pretreatment hemoglobin level, serum squamous cell carcinoma antigen (serum SCC-Ag), chemotherapy regimens and the cumulative dose of weekly cisplatin, were analyzed. The endpoints were overall survival (OS), local failure-free survival (LFFS) and disease-free survival (DFS).
Results: The median follow-up time was 42 months. The 4-year OS, LFFS and DFS were 73.8%, 77.9% and 67.2%, respectively. Four (3.2%) patients developed ≥grade 3 acute gastrointestinal (GI) toxicity and 29 (23.2%) patients developed ≥grade 3 acute hematological toxicity. Five (4.0%) patients developed ≥grade 3 late GI toxicity and seven (5.6%) patients developed ≥grade 3 late genitourinary system toxicity. On univariate analysis, adenocarcinoma was a poor prognostic factor for OS (p = 0.05), LFFS (p = 0.01) and DFS (p = 0.006). Patients with lymph nodes metastasis at diagnosis had worse OS (p = 0.02). The high cumulative dose of cisplatin (>180 mg/m2) had better OS (p = 0.03) and tended to have better survival on LFFS (p = 0.13) and DFS (p = 0.10). On multivariate analysis, adenocarcinoma was a significant independent prognostic factor for OS (p = 0.001), LFFS (p = 0.005) and DFS (p < 0.001). Initial lymph nodes metastasis was an independent predictor of OS (p = 0.013). Cumulative dose of weekly cisplatin significantly affected OS (p = 0.041), and high cumulative dose of cisplatin tended to have better LFFS (p = 0.083). Higher pretreatment hemoglobin level had better LFFS (p = 0.034).
Conclusion: Adenocarcinoma and lymph nodes metastases were poor prognostic factors for patients with locally advanced cervical cancer. Lower pretreatment hemoglobin level had poorer local control. Chemotherapy with a high cumulative dose of cisplatin tended to result in better survival.
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