Variable

Frequency

%

Frequency

%

1) Location of tumour

Recurrence group

No recurrence group

a) Side of tumour

Left

19

63.3

74

52.4

Right

11

36.7

67

47.6

b) Quadrant of tumour

Upper outer quadrant

25

83.3

113

80.1

Upper inner quadrant

2

6.7

6

4.3

Lower outer quadrant

2

6.7

6

4.3

Lower inner quadrant

1

3.3

3

2.1

Paracentral

0

0

13

9.2

2) Staging of tumour

a) T stage

T1

2

6.6

13

9.2

T2

15

50

77

54.6

T3

10

33.3

36

25.5

T4

3

10

15

10.6

b) N stage

N0

10

33.3

65

46.1

N1

6

20

46

32.6

N2

8

26.6

20

14.2

N3

6

20

10

7.1

c) Composite stage

Stage I

0

0

11

7.8

Stage II

14

46.6

74

52.4

Stage III

16

53.3

56

39.7

3) Pathological features

a) Histological subtypes

Infiltrating ductal carcinoma

29

96.6

128

90.7

Metaplastic carcinoma

1

3.3

8

5.6

Others

0

0

5

3.5

b) Grade of tumour

1

1

3.3

7

4.9

2

14

46.6

79

56

3

15

50

55

39

c) Lymphovascular invasion

Yes

8

26.7

16

11.3

No

22

73.3

125

88.6

d) Multifocality

Yes

1

3.3

4

2.8

No

29

96.7

137

97.2