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Table 4 MDSCs levels (cells/µL) according to tumor response

From: Pembrolizumab in combination with gemcitabine for patients with HER2-negative advanced breast cancer: GEICAM/2015–04 (PANGEA-Breast) study

MDSCs

 

Total

M-MDSCs

G-MDSCs

CB

(SD ≥ 24 weeks)

(n = 7)

PD

(n = 12)

CB

(SD ≥ 24 weeks)

(n = 7)

PD

(n = 12)

CB

(SD ≥ 24 weeks)

(n = 7)

PD

(n = 12)

Median

IR

Median

IR

Median

IR

Median

IR

Median

IR

Median

IR

Baseline

38.6

(n = 7)

53.0

47.6

(n = 11)

42.8

30.7

(n = 7)

32.8

39.8

(n = 11)

33.2

7.9

(n = 7)

20.9

5.2

(n = 11)

27.9

C3

17.4

(n = 7)

27.0

60.7

(n = 11)

247.4

4.3

(n = 7)

13.9

47.4

(n = 11)

223.1

5.2

(n = 7)

10.3

7.7

(n = 11)

24.3

C6/EOT

12.4

(n = 7)

8.5

23.2

(n = 5)

37.2

6.3

(n = 7)

8.5

8.0

(n = 5)

31.2

4.3

(n = 7)

10.2

12.4

(n = 5)

8.6

Baseline vs. C6/EOT

p-value

0.0781

0.8750

0.0469

0.8750

0.6875

0.6250

Baseline vs. C3

p-value

0.2969

0.6953

0.0313

0.7695

0.9375

0.6250

CB vs. PD

(C6/EOT)

p-value

0.0513

0.7453

0.0348

CB vs. PD

(C3)

p-value

0.1743

0.0572

0.5261

CB vs. PD

(baseline)

p-value

0.3651

0.1743

0.9278

  1. Abbreviations: MDSCs Myeloid derived suppressor cells, M-MDSCs Monocytic MDSCs, G-MDSCs Granulocytic MDSCs, CB Clinical benefit, SD Stable disease, PD Progressive disease, IR Interquartile range, C3 Cycle 3, C6 Cycle 6, EOT End of treatment