Table 6 Multivariate analysis of factors associated with overall survival of the data from SEER database(n = 179)

 I

1

 II

1.880(0.186 ~ 18.983)

0.593

0.354

 III

3.043(0.255 ~ 36.253)

0.378

0.214

 IV

0.526(0.236 ~ 1.171)

0.116

0.119

 Localized

1

 Regional

1.361(0.489 ~ 3.787)

0.555

0.556

 Distant

21.152(2.019 ~ 221.646)

0.011

0.009

 None

1

 1 to 3 regions

1.847(0.929 ~ 3.672)

0.080

0.103

 4 or more regions

0.621(0.243 ~ 1.587)

0.319

0.370

Positive lymph nodes

5.531(2.102 ~ 14.553)

0.001

0.002