Table 3 Univariate and multivariate analyses for OS of patients with PSRCC

Age (median [IQR])

66.0 (59.0, 75.0)

1.02 (1–1.03)

0.017

1.01 (1–1.02)

0.1986

Race (%)

Black

15 (8.3)

Reference

/

Others

14 (7.8)

1.64 (0.77–3.53)

0.201

/

White

151 (83.9)

1.26 (0.71–2.24)

0.427

/

Sex (%)

Female

72 (40.0)

Reference

/

Male

108 (60.0)

1.1 (0.81–1.5)

0.545

/

Grade (%)

Moderately

22 (12.2)

Reference

Reference

Poorly

150 (83.3)

2.41 (1.43–4.08)

0.001

1.9 (1.11–3.25)

0.0195

Undifferentiated

8 (4.4)

2.38 (0.98–5.79)

0.056

0.83 (0.29–2.42)

0.7361

Marital status (%)

Married

102 (56.7)

Reference

Unmarried

78 (43.3)

1.17 (0.86–1.59)

0.314

/

Primary site (%)

Body

17 (9.4)

Reference

/

Head

107 (59.4)

0.8 (0.47–1.37)

0.423

/

Others

39 (21.7)

1.8 (1–3.24)

0.052

/

Tail

17 (9.4)

1.19 (0.59–2.39)

0.622

/

AJCC stage (%)

I

7 (3.9)

Reference

Reference

II

71 (39.4)

1.27 (0.51–3.17)

0.606

1.91 (0.76–4.82)

0.1714

III

18 (10.0)

2.2 (0.81–5.98)

0.121

1.95 (0.71–5.36)

0.1930

IV

84 (46.7)

3.72 (1.5–9.27)

0.005

2.98 (1.16–7.65)

0.0232

Surgery (%)

No

111 (61.7)

Reference

Reference

Yes

69 (38.3)

0.27 (0.19–0.39)

< 0.001

0.27 (0.18–0.42)

< 0.001

Chemotherapy (%)

No/unknown

86 (47.8)

Reference

Reference

Yes

94 (52.2)

0.46 (0.34–0.63)

< 0.001

0.33 (0.22–0.48)

< 0.001

Radiation (%)

Yes

38 (21.1)

Reference

Reference

None/unknown

142 (78.9)

1.93 (1.32–2.82)

0.001

0.85 (0.54–1.35)

0.4887