Table 2 Univariate analysis of factors associated with the mitotic index of GIST.

Age, y

0.015

-0.756

0.450

0.989(0.960–1.018)

Sex

 Male

0.320

1.640

0.101

1.689(0.903–3.162)

 Female*

Tumor site

 Others

0.365

2.504

0.012

2.494(1.220–5.099)

 Gastric*

Boundaries

 Clear

0.371

-3.554

< 0.001

0.267(0.129–0.553)

 Unclear*

Calcification

 Yes

0.363

4.372

< 0.001

4.884(2.399–9.943)

 No*

Tumor size

 ≤ 2 cm

0.968

-4.281

< 0.001

0.016(0.002–0.106)

 2–5 cm

0.667

-4.860

< 0.001

0.039(0.011–0.145)

 5–10 cm

0.696

-3.018

0.003

0.122(0.031–0.479)

 > 10 cm*

Liquefaction/necrosis

 Yes

0.369

6.340

< 0.001

10.353(5.027–21.324)

 No*

Morphological characteristics

 Regular

0.369

-6.340

< 0.001

0.097(0.047–0.199)

 Irregular*

Growth pattern

 Intracavity growth

0.434

-3.078

0.002

0.263(0.112–0.616)

 Exophytic growth

0.457

0.183

0.855

1.087(0.444–2.660)

 Mixed growth*

Ulcers

 Yes

0.338

4.511

< 0.001

4.598(2.370–8.922)

 No*