Cancer cells

Effector: Target^a

NK cytolysis (%)^b

p^d

Control

(Not pre-treated)

Pre-treated by progesterone^c

MCF-7

10:1

80.3 ± 10.5 (12)

70.2 ± 12.9 (12)

<0.05

5:1

72.9 ± 11.3 (12)

61.8 ± 13.5 (12)

<0.05

2.5:1

50.9 ± 10.4 (12)

40.2 ± 11.8 (12)

<0.05

T47D

10:1

86.3 ± 8.5 (12)

78.9 ± 8.0 (12)

<0.05

5:1

79.2 ± 5.9 (12)

73.1 ± 8.0 (12)

<0.05

2.5:1

68.1 ± 4.4 (12)

62.6 ± 6.5 (12)

<0.05

MDA-MB-231

10:1

47.7 ± 14.3 (12)

36.3 ± 12.5 (12)

<0.05

5:1

31.9 ± 11.3 (12)

22.3 ± 10.5 (12)

<0.05

2.5:1

15.1 ± 11.8 (12)

6.5 ± 3.5 (12)

<0.05