Prognostic relevance of mitotic activity in patients with node-negative breast cancer.
Abstract
The prognostic relevance of mitotic activity was analyzed in a series of 306 patients with node-negative breast cancer treated with locoregional therapy alone, until early relapse. Mitotic activity was evaluated as the number of mitotic figures per 10 high-power fields (mitotic activity index) or per 1000 tumor cells (mitotic index). Counting was carried out blindly by two observers. A high correlation was observed between the two determinations (r(s) =.96, P <.001). For clinical analysis, three mitotic activity index subgroups (mitotic figures/field
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