Breast Cancer MSK 21-183

MSK 21-183:Selective Use of ALND in cT1-2N1 HR+/HER2- Breast Cancer Patients with 1 or 2 Positive Sentinel Lymph Nodes Undergoing Upfront Surgery and Adjuvant Radiation: A Prospective Study

The purpose of this study is to find out how often the researchers can avoid an ALND in women with early-stage, node-positive HR+/HER2- breast cancer who are having upfront surgery. The study researchers think that, if AUS before surgery can help identify people who may have only 1 or 2 affected lymph nodes, it will be possible to perform the less radical standard SLNB during surgery.

Inclusion Criteria

• Female patients aged ≥18 years with biopsy-proven invasive breast cancer
• Patients with cT1 or T2 tumors with palpable ipsilateral mobile adenopathy of level I/II axillary nodes with biopsy-proven nodal metastasis (cN1) who are undergoing upfront surgery
• Patients with tumors of the HR+/HER2- subtype, defined as:
  • HR+: Positive for estrogen receptor and/or progesterone receptor staining, indicated by ≥1% immunoreactive tumor nuclei
  • HER2-: Immunohistochemistry assay demonstrating no or faint staining in ≤10% of tumor cells (IHC 0 or 1+) or negative by dual probe in situ hybridization assay

Exclusion Criteria

• Patients with occult primary breast cancer
• Patients with prior ipsilateral breast cancer
• Patients who are pregnant
• Patients with stage IV disease at presentation
• Patients with advanced regional disease (cN2/cN3)

This study is for patients age 18 Years and older.
Available at: Hartford Hospital, Midstate Medical Center and HOCC