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Table 5 Multivariate cox regression analysis for 5-year overall

From: Chemotherapy is not necessary for early-stage serous and endometrioid ovarian cancer after undergoing comprehensive staging surgery

Characteristics

HR (95% CI)

P-value

Chemotherapy

 No/Unknown

Ref

 

 Yes

1.092(0.954–1.249)

0.201

Age, years

  ≤ 45

Ref

 

 45–65

1.044(0.877–1.244)

0.627

  > 65

1.486 (1.208–1.827)

< 0.001

Race

 White

Ref

 

 Non-white

0.984 (0.810–1.195)

0.872

Stage

 IA

Ref

 

 IB

0.967 (0.689–1.359)

0.848

 IC

1.063 (0.910–1.241)

0.441

 IIA

1.128 (0.862–1.475)

0.381

Grade

 1

Ref

 

 2

0.865 (0.743–1.008)

0.063

Laterality

 Right

Ref

 

 Left

0.984 (0.852–1.136)

0.824

 Other/Unknown

1.115 (0.862–1.443)

0.407

Tumor size, cm

  ≤ 10

Ref

 

  > 10

0.984 (0.848–1.141)

0.830

 Unknown

0.760 (0.630–0.918)

0.004

Histology

 Serous

Ref

 

 Endometrioid

0.697 (0.584–0.833)

< 0.001

  1. P < 0.05 was considered to indicate a statistically significant difference. HR hazard ratios, CI confidence intervals, Ref reference