TABLE 2.
Comparison of Breast Cancer Staging Between the 7th Edition and 8th Edition AJCC Staging Manual
| AJCC Staging Manual, 8th edition | Total | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| IA | IB | IIA | IIB | IIIA | IIIB | IIIC | |||
| AJCC Staging Manual, 7th edition | IA | 238,059 91.28% |
25,550 8.72% | 0 | 0 | 0 | 0 | 0 | 292,385 |
| IB | 11,277 94.1% |
704 5.88% | 0 | 0 | 0 | 0 | 0 | 11,981 | |
| IIA | 62,634 56.49% |
16,940 15.28% |
31,299 28.23% |
0 | 0 | 0 | 0 | 110,873 | |
| IIB | 4,198 10.45% |
17,262 42.99% |
7,049 17.55% |
7,054 17.57% |
4,591 11.43% |
0 | 0 | 40,154 | |
| IIIA | 0 | 11,955 46.80% |
1,396 5.46% |
4,746 18.58% |
4,566 17.87% |
373 1.46% |
2,511 9.83% |
25,547 | |
| IIIB | 0 | 0 | 0 | 0 | 1,067 37.76% |
1,100 38.92% |
659 23.32% |
2,826 | |
| IIIC | 0 | 0 | 0 | 0 | 4,086 40.50% |
4,235 41.98% |
1,767 17.52% |
10,088 | |
| Total | 344,994 69.86% |
72,361 14.65% |
39,744 8.05% |
11,800 2.39% |
14,310 2.90% |
5,708 1.16% |
4,937 1.00% |
493,854 | |
Percent frequency represents the percent of the row total (eg, 91.28% of 7th edition stage IA patients remained stage IA using the 8th edition criteria). Yellow boxes represent patients that were upstaged using the 8th edition, and blue boxes represent those who were downstaged using the 8th edition, whereas those in grey remained unchanged.