Effective (N = 50)

Percentage (%)

Tumor (T)

T1a + T1b

13

26

T1c

5

10

T2a + T2b

15

30

T2c

15

30

T4

2

4

Node (N)

NX

42

84

N0

6

12

N1

2

4

Metastasis (M)

Mx

29

58

M0

6

12

M1b

12

24