Table 3 Multivariate Cox proportional hazard regression analysis for progression-free survival (PFS) and overall survival (OS) according to post-treatment peripheral lymphocyte count.

From: Peripheral lymphocyte count as a surrogate marker of immune checkpoint inhibitor therapy outcomes in patients with non-small-cell lung cancer

 

PFS

OS

aHR (95% CI)

p

aHR (95% CI)

p

Age, year

 < 65

1 (reference)

 

1 (reference)

 

65–74

0.49 (0.29, 0.81)

0.006

0.67 (0.39, 1.12)

0.10

 ≥ 75

0.43 (0.24, 0.75)

0.004

0.51 (0.28, 0.93)

0.02

Sex

Male

1 (reference)

 

1 (reference)

 

Female

0.93 (0.54, 1.57)

0.87

0.94 (0.54, 1.64)

0.84

Smoking status

0.49 (0.28, 0.85)

   

Never

1 (reference)

 

1 (reference)

 

Ever

0.49 (0.28, 0.85)

0.006

0.65 (0.36, 1.19)

0.2

ECOG (ref 0)

0

1 (reference)

 

1 (reference)

 

1

2.04 (1.09, 3.78)

0.02

2.56 (1.24, 5.26)

0.02

 ≥ 2

3.00 (1.53, 5.92)

0.001

4.37 (2.11, 9.08)

 < 0.001

Histology

Adenocarcinoma

1 (reference)

 

1 (reference)

 

Sqaumous cell carcinoma

1.23 (0.64, 2.35)

0.54

1.16 (0.57, 2.37)

0.57

Other NSCLC

1.52 (0.90, 2.56)

0.18

2 (1.18, 3.40)

0.01

EGFR activating mutation

2.78 (1.54, 5.01)

0.001

1.86 (0.97, 3.61)

0.07

PD-L1 expression (≥ 1%)

0.48 (0.31, 0.78)

0.004

0.55 (0.34, 0.9)

0.01

Post-treatment PLC,

Quartile [min–max]

1 [208.6–1178.6]

1 (reference)

 

1 (reference)

 

2 [1181–1676.7]

0.61 (0.35, 1.06)

0.082

0.59 (0.32, 1.06)

0.09

3 [1686.7–2180]

0.40 (0.22, 0.73)

0.005

0.29 (0.15, 0.57)

 < 0.001

4 [2186.9–5141.7]

0.28 (0.16, 0.52)

 < 0.001

0.35 (0.19, 0.65)

 < 0.001

P for trend

0.001

0.005

  1. PFS, progression-free survival; OS, overall survival; aHR, adjusted hazard ratio; CI, confidence interval; PLC, peripheral lymphocyte count.