Table 1: Mastectomy and breast-conserving surgery among women with unilateral invasive breast cancer, index versus final procedure* in Canada (n = 56 892), by province, 2007/08 to 2009/10.
| Procedure | No. of women† |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| BC | AB | SK | MB | ON | QC | NB | NS | PEI | NL | Canada | |
|
Index procedure |
|||||||||||
| Breast-conserving surgery |
4 877 |
2 490 |
790 |
1 396 |
14 738 |
11 792 |
837 |
928 |
133 |
481 |
38 517 |
| Mastectomy |
2 596 |
2 482 |
896 |
607 |
6 719 |
3 138 |
521 |
843 |
107 |
406 |
18 375 |
| Total |
7 473 |
4 972 |
1 686 |
2 003 |
21 457 |
14 930 |
1 358 |
1 771 |
240 |
887 |
56 892 |
| Index mastectomy rate, % (95% CI) |
35 (33.6–35.8) |
50 (48.5– 51.3) |
53 (50.7–55.5) |
30 (28.2–32.3) |
31 (30.6–31.9) |
21 (20.3–21.6) |
38 (35.7–40.9) |
48 (45.2–49.9) |
45 (38.2–50.8) |
46 (42.4–49.0) |
32 (31.9–32.6) |
|
Final procedure |
|||||||||||
| Breast-conserving surgery |
4 040 |
2 204 |
592 |
1 282 |
13 413 |
10 979 |
719 |
794 |
100 |
277 |
34 439 |
| Mastectomy |
3 433 |
2 767 |
1 094 |
721 |
8 045 |
3 951 |
639 |
977 |
141 |
609 |
22 453 |
| Total |
7 473 |
4 971 |
1 686 |
2 003 |
21 458 |
14 930 |
1 358 |
1 771 |
241 |
886 |
56 892 |
| Final mastectomy rate, % (95% CI) | 46 (44.8–47.0) |
56 (54.2–57.0) |
65 (62.6–67.1) |
36 (33.8–38.0) |
37 (36.8–38.1) |
26 (25.7–27.1) |
47 (44.3–49.7) |
55 (52.8–57.4) |
59 (52.2–64.7) |
69 (65.6–71.7) |
39 (39.0–39.8) |
Note: CI = confidence interval. *Small differences between the totals for the index and final procedures for selected provinces are because of women moving to another province during the treatment period. †Unless otherwise stated.