Sentinel node scintigraphy in breast cancer using a dual tracer technique

Area of Science:

• Oncology
• Nuclear Medicine
• Surgical Oncology

Background:

• Sentinel node scintigraphy is crucial for breast cancer staging.
• Improving anatomical depiction and localization of sentinel nodes is essential for accurate staging.
• Intravenous pertechnetate administration was explored to enhance anatomical detail.

Purpose of the Study:

• To evaluate if intravenous pertechnetate administration affects sentinel lymph node (SLN) detection during scintigraphy.
• To compare SLN detectability in breast cancer patients with and without pertechnetate co-administration.
• To assess the impact on surgical detection rates of SLNs.

Main Methods:

• Retrospective comparison of SLN scintigraphy in 47 patients receiving radiocolloid plus pertechnetate versus 41 patients receiving radiocolloid alone.
• Comparison of lymph node detection rates at surgery using gamma probe and blue dye in both groups.
• Study of pertechnetate washout kinetics in 10 patients.

Main Results:

• No significant difference was observed in the number of lymph nodes detected by scintigraphy between the two groups.
• Surgical detection rates of lymph nodes were comparable in patients who received pertechnetate and those who did not.
• Pertechnetate washout kinetics showed decreasing activity over time.

Conclusions:

• Intravenous pertechnetate administration at 25 MBq for sentinel node scintigraphy in breast cancer does not compromise the detectability of radioactive lymph nodes.
• The combined approach can improve anatomical localization without sacrificing detection efficacy.
• This method offers a potential benefit for surgical planning in breast cancer management.