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When chemotherapy is given before surgery, the surgeon marks the lymph node that was known to contain cancer with a clip before treatment starts, then removes that exact node afterwards along with the sentinel nodes. It is the difference between missing leftover cancer one time in ten and one time in fifty.
ACOSOG Z1071 exposed the problem. Among 525 women with biopsy-proven node-positive disease who had two or more sentinel nodes removed after chemotherapy, the sentinel nodes were clear but the axillary clearance was not in 39 cases, a false-negative rate of 12.6 percent against a pre-specified acceptable threshold of 10 percent. Chemotherapy scars and reroutes lymphatics, so the node the tracer reaches after treatment is not reliably the node that was diseased before it.
The MD Anderson prospective study fixed it by marking the node. Placing a clip in the biopsied node before chemotherapy and localising it at surgery gave a false-negative rate of 4.2 percent for the clipped node alone (95 percent confidence interval 1.4 to 9.5), against 10.1 percent for sentinel node dissection alone (4.2 to 19.8); combining the two brought it to 1.4 percent (0.03 to 7.3, p=0.03), and formal targeted axillary dissection in 85 patients gave 2.0 percent. The finding that justifies the whole technique is that the clipped node was not retrieved as a sentinel node in 23 percent of patients, and six women had negative sentinel nodes but metastasis in the clipped node.
Localisation is by iodine-125 seed, radiofrequency or magnetic marker, wire, or carbon tattoo, depending on what the unit has. Dual tracer mapping and removing at least three sentinel nodes lower the false-negative rate further.
What happens after a clear targeted axillary dissection is the live question. NSABP B-51 has answered the radiotherapy half: regional nodal irradiation adds nothing once the nodes are pathologically clear. ATNEC is asking the surgical half and is still recruiting.
Showing the technology this term belongs to: Sentinel lymph node biopsy.
Shares Doing less to the armpit, Sentinel node biopsy, Lymphadenectomy (lymph node dissection), Sentinel lymph node biopsy.
Shares ATNEC, Doing less to the armpit, Sentinel node biopsy, Sentinel lymph node biopsy.
Shares Doing less to the armpit, Sentinel node biopsy, Lymphadenectomy (lymph node dissection), Sentinel lymph node biopsy.
Shares Doing less to the armpit, Sentinel node biopsy, Lymphadenectomy (lymph node dissection), Sentinel lymph node biopsy.
Shares Doing less to the armpit, Sentinel node biopsy, Sentinel lymph node biopsy, HER2-positive breast cancer.
Shares Doing less to the armpit, Sentinel node biopsy, Lymphadenectomy (lymph node dissection), Sentinel lymph node biopsy.
Shares Doing less to the armpit, Sentinel node biopsy, Sentinel lymph node biopsy, HER2-positive breast cancer.
Shares Doing less to the armpit, Sentinel node biopsy, Lymphadenectomy (lymph node dissection), Sentinel lymph node biopsy.