Table 5 Multivariate Cox analysis of OS and CSS of five types of soft tissue sarcomas with a high risk of lymph node metastasis after propensity score matching (PSM)

Age, years

 < 19

Reference

Reference

 ≥ 19

3.218 (1.868–5.543)

< 0.001

2.702 (1.49–4.901)

Year of diagnosis

 1988–2005

Reference

 2006–2015

1.089 (0.805–1.472)

0.581

Site

 Head, Face, Neck

Reference

Reference

 Upper limb, shoulder

0.577 (0.3–1.108)

0.099

0.695 (0.324–1.49)

 Lower limb, hip

0.691 (0.367–1.299)

0.251

0.789 (0.378–1.649)

Grade

 I + II

Reference

Reference

 III + IV

1.052 (0.613–1.805)

0.854

1.598 (0.825–3.096)

 Unknown

1.19 (0.695–2.037)

0.526

1.704 (0.872–3.328)

Laterality

 Left

 Right

1.047 (0.752–1.457)

0.786

1.024 (0.712–1.474)

 Unknown

0.944 (0.481–1.854)

0.868

1.005 (0.457–2.212)

Histology

Rhabdomyosarcoma

Reference

Reference

 Angiosarcoma

0.942 (0.574–1.545)

0.814

1.258 (0.724–2.187)

 Ewing sarcoma

0.397 (0.187–0.845)

0.02

0.53 (0.236–1.187)

 Epithelioid sarcoma

0.692 (0.415–1.154)

0.158

0.825 (0.464–1.466)

 Clear cell sarcoma

0.785 (0.455–1.355)

0.385

1.08 (0.593–1.969)

Stage

 Localized

Reference

Reference

 Regional

1.501 (1.078–2.09)

0.02

1.689 (1.181–2.415)

 Distant

3.336 (1.776–6.266)

< 0.001

4.308 (2.259–8.217)

NLND

 No

Reference

Reference

 Yes

0.718 (0.535–0.962)

0.03

0.699 (0.506–0.967)

Size, cm

 < 4

Reference

Reference

 4–10

1.816 (1.26–2.616)

0

2.3 (1.513–3.496)

 ≥ 10

2.708 (1.636–4.482)

< 0.001

3.266 (1.857–5.745)

Marital status

 Married

Reference

Reference

 Never married

0.949 (0.633–1.422)

0.799

0.976 (0.627–1.52)

 Divorced/widowed/separated

1.971 (1.279–3.037)

0

1.832 (1.13–2.972)

 Unknown

1.077 (0.465–2.491)

0.863

1.046 (0.39–2.804)