Magnetically guided surgery after primary systemic therapy for breast cancer: implications for enhanced axillary mapping.

"Disclosure A.K. reports consultation for Resitu AB, honoraria from Pfizer, AstraZeneca, Kubtec, UEMS, and Elsevier, and institutional funding from Endomag, outside the scope of the submitted work. The authors declare no other conflict of interest."

"Funding The authors have no funding to declare."

"Successful SLND was defined as the retrieval of at least one SLN with the respective technique. Concordance per procedure was defined as the proportion of procedures with at least one concordant SLN for both tracers divided by the procedures with at least one SLN detected with the radioisotope ((SPIO and radioisotope)/radioisotope). Reverse concordance per procedure was defined respectively ((SPIO and radioisotope)/SPIO). The number of SLN retrieved per technique was documented. Nodal and reverse concordance were calculated similarly. This study was registered in clinicaltrials.gov (NCT05985551) and undertaken to inform the design of the SENTINEO study (NCT05625698)."