the SENOMAC trial

Omission of Axillary Clearance in Breast Cancer Patients With Sentinel Node Macrometastases: a Randomized Trial

Since the introduction of sentinel node biopsy in breast cancer, it has become clear that its use is reliable and reproducible. Today, it is clinical routine to not remove further lymph nodes from the axilla (arm pit) in case the sentinel node (which is the first lymph node/s reached by lymphatic flow from the breast) is free of tumor deposits. It is also routine to leave remaining lymph nodes behind in case the sentinel node contains a minimal cluster of tumor cells, called isolated tumor cells (formerly submicrometastasis). Even in slightly larger tumor deposits, so called micrometastasis (up to 2 mm in size), it has been shown that a completion axillary clearance (removal of further lymph nodes from the arm pit) does not contribute to a better survival. Data from a randomized study indicate that it seems safe to omit axillary clearance even if the sentinel node biopsy shows up to 2 nodes with tumor deposits over 2 mm in size (macrometastasis). These studies have changed clinical practice in many countries, however, it is still debated whether it is safe to omit axillary clearance in the case of sentinel node macrometastasis due to under-recruitment in the aforementioned study. The rationale for omitting extensive axillary surgery is the avoidance of postoperative morbidity such as arm lymphedema, loss of sensation, pain and swelling.

The hypothesis is that refraining from axillary clearance in breast cancer patients with 1-2 sentinel nodes with macrometastasis will not worsen breast cancer-specific survival by more than a maximum of 2.5% after 5 years.

This study is a European prospective multicenter randomized trial including centers in Sweden, Denmark, Italy, Germany, Greece and Austria. Planned accrual is 3500 patients.

Breast cancer patients without clinical signs of axillary nodal involvement will be eligible for sentinel node biopsy. Also those individuals having sentinel node biopsy performed prior to neoadjuvant treatment are eligible. Those patients who are found to have up to two sentinel node containing macrometastasis will be informed about this trial, and those wishing to participate will be randomized to either undergo further axillary surgery (clearance) or not. Outcome measures are breast cancer-specific survival, disease-free survival, axillary recurrence rate and overall survival.