Abstract
The widespread use of mammography has resulted in the detection of an increasing number of small invasive breast cancers, i.e. those that are 1cm and smaller. Patients with these small cancers generally have a low incidence of axillary lymph node metastases, and this has led some to question the routine use of axillary dissection in these patients. In addition, the prognosis of these patients is generally favorable, and the routine use of adjuvant systemic therapy is difficult to justify. Nonetheless, some patients with these small invasive cancers will have axillary nodal involvement and/or develop metastatic disease. The identification of this prognostically unfavorable subset of patients within this otherwise favorable group is an important goal of clinical research. In this article, we review the available literature on prognostic factors for patients with breast cancers 1cm and smaller to help determine which of these features might be of value in the identification of patients at risk for axillary lymph node involvement and/or metastatic disease.
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