Table 2 P-gp expression in renal cell carcinoma and association with age at diagnosis, tumour size, histological grade and nodal status (n = 95)

Cases expressing P-gp

95

Percentage Staining

1+ (1<25%)

6

0

2

4

2+ (≥ 25–50%)

17

5

8

4

3+ (≥ 50<75%)

43

9

23

11

4+ (≥ 75%)

29

22

5

2

Age

< 60

41

20

13

8

> 60

54

16

25

13

Gender

Male

49

26

17

6

Female

46

10

21

15

Tumour size

< 7 cm

56

21

26

9

> 7 cm

39

15

12

12

Tumour grade (7 unknown)

Grade 1

16

5

8

3

Grade 2

35

16

15

4

Grade 3

37

13

13

11

Nodal status (56 unknown)

Positive

31

10

15

6

Negative

8

2

4

2