Table 4 Characteristics of breast cancer patients who received radiotherapy treatment after breast conserving surgery ¹

Overall

3607 (89)

4067

1780 (86)

2060

276 (83)

331

Age at diagnosis

P < 0.001

P < 0.001

P < 0.001

<50

821 (93)

880

599 (91)

656

93 (83)

112

50-59

1096 (94)

1171

521 (89)

585

94 (93)

101

60-69

971 (92)

1051

392 (91)

430

57 (86)

66

70-79

601 (86)

697

211 (85)

248

23 (85)

27

≥80

118 (44)

268

57 (40)

141

9 (36)

25

Geography of surgery

P < 0.001

P = 0.001

P = 0.70

Calgary

1485 (91)

1637

783 (87)

901

113 (81)

139

South

236 (82)

289

113 (78)

145

20 (80)

25

Central

149 (84)

178

90 (80)

112

14 (82)

17

Edmonton

1640 (89)

1849

738 (89)

832

114 (85)

134

North

97 (85)

114

56 (80)

70

15 (94)

16

Year of diagnosis

P = 0.06

P = 0.01

P = 0.10

2002 - 2004

1148 (90)

1277

565 (89)

632

78 (91)

86

2005 - 2007

1145 (87)

1315

560 (84)

668

101 (81)

124

2008 - 2010

1314 (89)

1475

655 (86)

760

97 (80)

121

ER/PR Status & Hormone therapy

P < 0.001

P < 0.001

P < 0.001

ER/PR positive & received hormone

2337 (93)

2514

1399 (92)

1516

213 (90)

237

ER/PR positive & no hormone

685 (77)

893

79 (46)

170

7 (24)

29

ER/PR negative

585 (89)

660

302 (81)

374

56 (86)

65

Neo-adjuvant chemotherapy

P = 0.57

P = 0.36

P = 0.10

Not received

3601 (89)

4060

1720 (86)

1994

256 (84)

303

Received

6 (86)

7

60 (91)

66

20 (71)

28

Adjuvant chemotherapy

P < 0.001

P < 0.001

P < 0.001

Not received

2951 (87)

3381

617 (75)

823

52 (55)

95

Received

656 (96)

686

1163 (94)

1237

224 (95)

236