In breast cancer staging, what does N1 indicate?

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N1 in breast cancer staging refers to cancer that has started to involve nearby lymph nodes, specifically the axillary (arm pit) nodes on the same side as the tumor, but only to a limited extent. The nodes are typically movable, indicating that the disease hasn’t progressed to involve very large, fixed nodal masses or more distant nodal groups. The key idea is that there is some nodal spread, but it’s still a relatively small nodal burden, rather than no nodal involvement or extensive nodal disease. So the best choice reflects a small number of affected axillary nodes, rather than zero, a large burden, or widespread nodal involvement.