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Table 1 Definitions of T and N for SEER breast cancer cases from 1990-2000.

From: On an ensemble algorithm for clustering cancer patient data

Prognostic factors Categories Level
Tumor size T 1(T ≤ 2cm)
T 2(2cm < T ≤ 5cm )
T 3(T > 5cm)
1
2
3
Nodal status N 0(No positive axillary nodes)
N 1(1 - 3 nodes contain tumor)
N 2(4 - 10 nodes contain tumor)
N 3(More than 10 nodes contain tumor)
1
2
3
4