Table 2 Genotype and allele frequency of the CYP1A2*1F (A) allele in patients with PCT and controls in this study and in three previous studies.

This study (USA)

1 & 2

66

55.1

39.1

5.8

75

25

1

50

60.0

36.0

4.0

78

22

2

16

31.0

56.0

13.0

59

41

Controls

72

36.1

51.4

12.5

62

38

Christiansen et al. (Denmark) (17)

1 & 2

53

71.7

22.6

5.7

83

17

1

40

70.0

27.5

2.5

84

16

2

13

76.5

7.7

15.4

81

19

Controls

60

46.7

43.3

10.0

68

32

Dereure et al. (France) (19)

1 & 2

49

38.8

53.1

6.1

67

33

1

45

N/A

N/A

N/A

N/A

N/A

2

4

N/A

N/A

N/A

N/A

N/A

Controls

48

39.6

47.9

12.5

64

37

Fontanella et al. (Spain) (18)

1 & 2

102

48.0

49.0

2.9

73

28

1

80

45.0

52.5

2.5

71

29

2

22

59.1

36.5

4.5

77

23

Controls

150

40.0

48.0

12.0

64

36