Group A

Group B

Group C

Group D

IIA stage

Number

37

12

21

12

Mean survival (years)

3.242 ± 0.6

1.600 ± 0.4

0.454 ± 0.1

0.652 ± 0.2

IIB stage

Number

76

16

12

14

Mean survival (years)

1.720 ± 0.2

0.931 ± 0.1

0.713 ± 0.1

0.957 ± 0.2