Treatment

Population

P¹

Adjuvant chemotherapy

Type of surgery (N (%))

BRCA 1/2 cases

General

population-based

Cancer

hospital-based

Node negative

No

Breast conserving therapy

130 (63)

3488 (62)

2223 (81)

<0.001

Modified radical mastectomy

75 (37)

2114 (38)

531 (19)

Yes

Breast conserving therapy

30 (45)

144 (55)

90 (71)

0.001

Modified radical mastectomy

36 (55)

118 (45)

36 (29)

Node positive

No

Breast conserving therapy

6 (21)

1330 (43)

702 (39)

0.008

Modified radical mastectomy

22 (79)

1799 (57)

1087 (61)

Yes

Breast conserving therapy

50 (36)

697 (44)

609 (44)

0.155

Modified radical mastectomy

90 (64)

884 (56)

780 (56)