Introduction/Background Brachytherapy represents an essential component as part of treatment for cervical and endometrial cancer. The technique has evolved over time, from 2D X-ray imaging to 3D image guided brachytherapy, this improves the coverage of target volumes and reduces toxicities.

Methodology Retrospective analysis of a single institution center was performed for histologically confirmed cervical and endometrial cancer patients, treated with Low Dose Rate brachytherapy (LDR) between July 2020-November 2020. Analysis was performed using SPSS software.

Objective Analyze the time required to calculate brachytherapy in minutes with 2D and 3D techniques.

Results 36 patients treated with brachytherapy were analyzed: 25 (69%) with cervical cancer and 11 (31%) with endometrial cancer. 32 patients received RTE, most of them used dose of 50Gy/25Fx and in 1 patient 45Gy/25Fx.

In the brachytherapy treatment, Fletcher was used in 16(44%) and only colpostates in 20(56%). The doses used were 2 applications with doses of 20Gy in 80%, 20Gy in 1 application in 11% and 3 applications of 20Gy in 8%. The reported toxicities of RTE and brachytherapy by tumor type are shown in table 1.

The status of the patients: 81% have controlled disease in follow-up, 1(3%) presented recurrence and 6(17%) presented disease progression.

In the analysis of the calculation time by technique, a mean of 1411 ± 321min was observed in the 2D group and a median of 1416 ± 322min in the 3D group with a p= 0.205. Evaluating difference by type of tumor: Endometrium 2D 1166min and 3D 1167min p=0.9 and in cervical cancer 2D 1518min and 3D 1526 p= 0.18.

The calculation time in patients with cervical cancer depending on the equipment used and the technique used with p=0.000 table 2.

Conclusion Although making a 3D brachytherapy calculation is more complex, there is no difference in time compared to 2D.

Disclosures All authors declare that they have no conflicts of interest.