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Aims Fast-track axillary node clearance (ANC) leads to overtreatment of axilla. Improved quantification by axillary US (AUS) is suggested to avoid unnecessary ANC and proceed with ANC or SLNB based on the number of abnormal axillary nodes. This retrospective study was aimed to evaluate whether ANC can be omitted based on AUS quantification in patients with low axillary burden. Methods Retrospective data of breast cancer patients who underwent ANC following a positive pre-operative axillary nodal biopsy between 1 January 2017 and 31 December 2018 were included in this study. The patients who received neoadjuvant chemotherapy, those having ANC following positive SLNB and those with axillary recurrence were excluded. The histopathology results of ANC were correlated with axillary ultrasound findings. Results 45 patients underwent fast-track ANC following positive axillary core biopsy. On pre-operative AUS, 18 of these patients were reported to have a single abnormal node, while 8 had two abnormal nodes and 19 patients had multiple abnormal nodes. The comparison of the number of metastatic nodes following ANC, and the reported abnormal nodes on pre-operative AUS, showed that 57.3% of patients with 1 – 2 abnormal nodes on AUS had 3 or more metastatic nodes and 26.3% of patients with multiple abnormal nodes on AUS had 1 – 2 metastatic nodes following ANC. Conclusions The quantification of the axillary burden with pre-operative AUS does not correlate with the number of metastatic axillary nodes. The reported relevant axillary burden on AUS is not sufficiently specific to form the basis of omission of ANC.

TP8.1.1 Does ultrasound quantification of suspicious axillary nodes correlate with pathological results?