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Table 2 Diagnostic values, including sensitivity, specificity, positive predictive value and negative predictive value, combining assay seromarkers

From: Establishment of using serum YKL-40 and SCCA in combination for the diagnosis of patients with esophageal squamous cell carcinoma

Combinations

Sensitivity(%)

Specificity(%)

PPV(%)

NPV(%)

YKL-40

72.70

84.13

84.50

72.11

CEA

8.00

96.80

75.00

46.72

CYFRA21-1

40.00

92.06

85.71

56.31

YKL-40 or CEA

74.00

83.20

84.09

72.73

YKL-40 or CYFRA21-1

82.00

77.78

81.46

78.40

CEA or CYFRA21-1

44.00

89.60

69.47

57.14

YKL-40 or CEA or CYFRA21-1

83.33

76.80

81.17

79.34

  1. Cut-off values: 58.0 ng/ml for YKL-40; 5.0 ng/ml for CEA; 3.3 ng/ml for CYFRA21-1; 1.5 ng/ml for SCCA.