Impact of brachytherapy technique (2D versus 3D) on outcomes of cervical cancer: A Systematic Review and Meta-analysis

Abstract Background: To perform a systematic review and meta-analysis of the impact of brachytherapy (BT) technique (two-dimensional [2D] or three-dimensional image-guided [3D]) on outcomes of cervical cancer patients. Methods: PubMed and Embase databases were searched up to April 16, 2019, for studies which evaluated the effect of 3D-BT compared to 2D-BT in cervical cancer, and endpoints included cumulative incidence of severe toxicity, locoregional recurrence-free survival (LRRFS), progression-free survival (PFS), and overall survival (OS). Hazard ratios (HRs) were pooled in the meta-analysis using the random-effects model. Results: Six studies of 8 cohorts were included in the quantitative synthesis. The pooled hazard ratio (HR) regarding toxicity was evaluated in 5 cohorts in 3 studies, and the HR of 3D-BT compared to 2D-BT was 0.54 (95% confidence interval [CI], 0.37-0.77). All 6 studies were included for the synthesis for LRRFS, and the pooled HR favors 3D-BT (0.61 [95% CI, 0.40-0.93]). For PFS, 3 studies were included for analysis and 3D-BT was superior to 2D-BT (HR = 0.75 [95% CI, 0.0.59–0.96]). Five studies were included for the pooled HR regarding OS, and pooled HR of 3D-BT compared to 2D-BT was 0.65 (95% CI, 0.40–1.06). Conclusions: 3D-BT might reduce severe toxicity and improve LRRFS, and PFS in patients with cervical cancer. 3D-BT should be considered for standard management of cervical cancer, and efforts for adopting this procedure in Korea should be pursued.