Evaluation of the Effect of Axillary Radiotherapy Dose and the Development of Lymphedema in Breast Cancer Patients.

Purpose: The present study is aiming to correlate different radiotherapy techniques, fractionations, and doses received by each axillary LN level and axillary vessels with the development of breast cancer-related lymphedema (BCRL).

Methods And Materials: We retrospectively studied 181 female breast cancer patients who were diagnosed and treated by radiation therapy during the period from January 2012 to December 2017. The radiotherapy treatment plans were recalled from the archives. The axillary LN levels I, II, III, supraclavicular LN were contoured as well as axillary vessels. New dose volume histograms were generated to correlate between the radiotherapy dose t and the development of BCRL.

Results: The study included 162 patients treated with a 3D radiotherapy technique and 19 treated with a 2D radiotherapy technique; 124 patients underwent MRM, while 57 patients underwent BCS; 117 patients were treated with a hypofractionated technique, while 64 patients were treated with a conventional radiotherapy technique. The cumulative incidence of BCRL after radiotherapy was 20.4%. There was a statistically significant relationship between the 2D radiotherapy technique compared with 3DCRT and development of lymphedema (55 vs. 16.6, respectively; < 0.001). Patients who were treated with conventional radiotherapy had significantly higher rates of lymphedema (42.2%) compared with hypofractionated radiotherapy (8.5%) ( < 0.001). There was a non-significant relationship between mean radiotherapy dose to axillary levels or axillary vessels and development of lymphedema.

Conclusion: Breast cancer radiotherapy with the 2D technique and conventional fractionation protocol might increase the risk of BCRL. No correlation was observed between radiotherapy dose to each axillary LN level, axillary vessels and BCRL.