Differences in Transient Fluid Retention and Lymphedema With Breast Cancer Treatment for Lymphatic Microsurgery.

[BACKGROUND] Breast cancer-related lymphedema (BCRL) is a common complication. Repeated taxane-based chemotherapy has been shown to induce endothelial inflammation, leading to fluid retention. Patients with transient fluid retention only have upper limb edema without lymphatic dysfunction. Therefore, indocyanine green lymphography revealed linear findings, and lymphatic microsurgery is not required. This study aimed to investigate the difference between BCRL and fluid retention and present the indication for lymphatic microsurgery for these patients.

[METHODS] The study population was divided into BCRL and fluid retention groups. Age, body mass index, laterality, surgery type (lymph node, breast, or no surgery), disease stage, regional lymph node irradiation, hormone therapy, chemotherapy type (taxane- or non-taxane-based group), and treatment with trastuzumab were compared.

[RESULTS] The BCRL and fluid retention groups consisted of 168 and 73 patients, respectively. The BCRL group had significantly higher rates of axillary lymph node dissection (96.4%) and lymph node irradiation (51.8%) than the fluid retention group (53.4% and 24.7%, respectively; P < 0.001 for both). The fluid retention group had a significantly higher rate of taxane-based chemotherapy (100%) than the BCRL group (92.9%; P = 0.02). No significant differences in other characteristics, including treatments with hormone and trastuzumab, were observed.

[CONCLUSIONS] Lymphatic microsurgery should be performed after confirming the diagnosis by indocyanine green lymphography, particularly for patients with fluid retention induced by taxane-based chemotherapy. Because the generalized swelling induced by taxane-based chemotherapy is resolved 6 months after chemotherapy, we should wait at least 6 months to perform lymphatic microsurgery.