Published in:
01-08-2013 | Breast Oncology
Technical Effects of Adding 1 % Lidocaine to Technetium Sulfur Colloid for Sentinel Lymphatic Mapping in Early Breast Cancer: Analysis of Data from a Double-blind Randomized Controlled Trial
Authors:
Cletus A. Arciero, MD, Leonard R. Henry, MD, Robin S. Howard, MA, George E. Peoples, MD, Anton J. Bilchik, MD, PhD, Itzhak Avital, MD, Chester C. Buckenmaier III, MD, Alexander Stojadinovic, MD
Published in:
Annals of Surgical Oncology
|
Issue 8/2013
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Abstract
Background
A practice standard in sentinel lymph node (SLN) mapping in breast cancer is intradermal injection of technetium-99m sulfur colloid (Tc-99m), resulting in significant patient discomfort and pain. A previous randomized controlled trial showed that adding lidocaine to Tc-99m significantly reduced radioisotope injection-related pain. We tested whether 1 % lidocaine admixed with Tc-99m affects feasibility of SLN mapping.
Methods
Between January 2006 and April 2009, 140 patients with early breast cancer were randomly assigned (1:1:1:1) to receive standard topical 4 % lidocaine cream and intradermal Tc-99m (control) or to one of three other study groups: topical placebo cream and injection of Tc-99m containing sodium bicarbonate (NaHCO3), 1 % lidocaine, or both. All SLN data were collected prospectively.
Results
Study groups were comparable for clinicopathological parameters. As previously reported, the addition of 1 % lidocaine to the radioisotope solution significantly improved patient comfort. Overall SLN identification rate in the trial was 93 %. Technical aspects of SLN biopsy were similar for all groups, including time from injection to operation, first SLN (SLN 1) gamma probe counts, ex vivo counts for SLN 1 and SLN 2, and axillary bed counts. SLN identification rates were comparable statistically: control (96 %), lidocaine (90 %), sodium bicarbonate (97 %), and sodium bicarbonate–lidocaine (90 %). The control group had a significantly higher SLN 2/SLN 1 ex vivo count ratio, and the number of SLNs detected was significantly reduced in the lidocaine versus no-lidocaine groups (p < 0.05).
Conclusions
Addition of 1 % lidocaine to standard radioisotope solution for SLN mapping in breast cancer is associated with fewer SLNs detected, but it does not appear to compromise SLN identification.