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Table 2 Survival outcomes for the surrogate endpoints at 2 and 3 years

From: Identification of surrogate endpoints in patients with locoregionally advanced nasopharyngeal carcinoma receiving neoadjuvant chemotherapy plus concurrent chemoradiotherapy versus concurrent chemoradiotherapy alone

Surrogate endpoint

Events

Survival rates a

NACT+CCRT group

CCRT group

Total,

NACT+CCRT group, %

CCRT group, %

P-value *

(n = 104, %)

(n = 104, %)

No. (%)

At 2 years

 PFS

15 (14.4)

25 (24.0)

40 (29.2)

87

76

0.078

 FFS

14 (13.5)

22 (21.2)

36 (27.3)

87

79

0.134

 D-FFS

12 (11.5)

21 (20.2)

33 (15.9)

88

80

0.092

 LR-FFS

3 (2.9)

6 (5.8)

9 (4.3)

98

94

0.284

At 3 years

 PFS

19 (18.3)

31 (29.8)

50 (24.0)

83

72

0.049

 FFS

16 (15.4)

28 (26.9)

44 (21.2)

85

75

0.040

 D-FFS

12 (11.5)

25 (24.0)

37 (17.8)

88

77

0.022

 LR-FFS

5 (4.8)

9 (8.7)

14 (6.7)

95

92

0.235

  1. Abbreviations: CCRT concurrent chemoradiotherapy; D-FFS distant failure-free survival; FFS failure-free survival; LR-FFS locoregional failure-free survival; NACT neoadjuvant chemotherapy; PFS progression-free survival
  2. aThe survival rates for the surrogate endpoints were estimated using the Kaplan-Meier method
  3. *P-values were calculated using the log-rank test