Optimizing Dose and Timing in Magnetic Tracer Techniques for Sentinel Lymph Node Detection in Early Breast Cancers: The Prospective Multicenter SentiDose Trial

Abdi-Fatah Hersi, Lida Pistiolis, Carlos Dussan Luberth, Eva Vikhe-Patil, Fredrik Nilsson, Imad Mohammed, Roger Olofsson Bagge, Fredrik Wärnberg, Staffan Eriksson, Andreas Karakatsanis, Abdi-Fatah Hersi, Lida Pistiolis, Carlos Dussan Luberth, Eva Vikhe-Patil, Fredrik Nilsson, Imad Mohammed, Roger Olofsson Bagge, Fredrik Wärnberg, Staffan Eriksson, Andreas Karakatsanis

Abstract

Superparamagnetic iron oxide nanoparticles (SPIO) are non-inferior to radioisotope and blue dye (RI + BD) for sentinel lymph node (SLN) detection. Previously, 2 mL SPIO (Sienna+®) in 3 mL NaCl was used. In this dose-optimizing study, lower doses of a new refined SPIO solution (Magtrace®) (1.5 vs. 1.0 mL) were tested in different timeframes (0-24 h perioperative vs. 1-7 days preoperative) and injections sites (subareolar vs. peritumoral). Two consecutive breast cancer cohorts (n = 328) scheduled for SLN-biopsy were included from 2017 to 2019. All patients received isotope ± blue dye as back-up. SLNs were identified primarily with the SentiMag® probe and thereafter a gamma-probe. The primary endpoint was SLN detection rate with SPIO. Analyses were performed as a one-step individual patient-level meta-analysis using patient-level data from the previously published Nordic Trial (n = 206) as a third, reference cohort. In 534 patients, the SPIO SLN detection rates were similar (97.5% vs. 100% vs. 97.6%, p = 0.11) and non-inferior to the dual technique. Significantly more SLNs were retrieved in the preoperative 1.0 mL cohort compared with 1.5 and the 2.0 mL cohorts (2.18 vs. 1.85 vs. 1.83, p = 0.003). Lower SPIO volumes injected up to 7 days before the operation have comparable efficacy to standard SPIO dose and RI + BD for SLN detection.

Keywords: breast cancer; magnetic tracer; sentinel lymph node; sentinel lymph node biopsy; superparamagnetic iron oxide.

Conflict of interest statement

The authors declare no conflict of interest.

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Source: PubMed

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