Recurrence-free survival (RFS) of 1 ,3 and 5 year was 98%,91%,88% for low risk group; 96%,83%,75% for moderate risk group; and 87%,62%,57% for high risk group respectively.

• 低危组1年；3年 ；5年无复发生存率为98%25 ；91%25 ；88%25 ；中危组为96%25 ；83%25 ；75%25 ；高危组为87%25 ；62%25 ；51%25 ；三组间P<0 0001；PI值与预后负相关。