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Table 1 Age-adjusted female adenoid cystic carcinoma of the breast incidence rates and incidence rate ratios

From: Adenoid cystic carcinoma of the breast in the United States (1977 to 2006): a population-based cohort study

 

Total

Characteristic

n

IR

IRR

95% CI

Total

338

0.92

NA

 

Race

    

   Whites

295

0.97

1.00

Reference

   Blacks

20

0.59

0.61

0.37 to 0.96

   Other/unspecified

23

~

~

~

Calendar period

    

   1977 to 1986

79

0.78

1.00

Reference

   1987 to 1996

121

1.02

1.30

0.97 to 1.76

   1997 to 2006

138

0.96

1.23

0.93 to 1.65

Age

    

   <50 years

59

0.25

1.00

Reference

   ≥50 years

279

2.70

11.02

8.31 to 14.87

Laterality

    

   Right

164

0.45

1.00

Reference

   Left

173

0.47

1.06

0.85 to 1.32

   Not specified

1

~

~

~

Site

    

   Upper outer quadrant

105

0.29

1.00

Reference

   Upper inner quadrant

29

0.08

0.28

0.18 to 0.43

   Lower outer quadrant

23

0.06

0.22

0.13 to 0.35

   Lower inner quadrant

14

~

~

~

   Nipple/central

28

0.08

0.27

0.17 to 0.41

   Overlapping

89

0.24

0.83

0.62 to 1.11

   Not specified

50

0.14

0.47

0.33 to 0.67

Stage

    

   Localized

320

0.87

1.00

Reference

   Regional

14

~

~

~

   Distant

1

~

~

~

   Unstaged

3

~

~

~

LN and sizea

    

   LN negative, ≤2 cm

126

0.50

1.00

Reference

   LN negative, >2 cm

67

0.26

0.52

0.38 to 0.71

   LN positive, ≤2 cm

2

~

~

~

   LN positive, >2 cm

3

~

~

~

   Other/not specified

46

0.18

0.36

0.25 to 0.51

Hormone receptorsb

    

   ER-negative/PR-negative

128

0.56

1.00

Reference

   ER-negative/PR-positive

6

~

~

~

   ER-positive/PR-positive

21

0.09

0.16

0.10 to 0.25

   ER-positive/PR-negative

12

~

~

~

   Other/not specified

55

0.24

0.42

0.30 to 0.59

  1. Data from the nine cancer registry areas of the Surveillance, Epidemiology and End Results Program, 1977 to 2006. Incidence rates are age-adjusted to the 2000 US standard population and are expressed per 1 million person-years. Incidence rate ratios are based on unrounded rates. n, number of cases; IR, incidence rate; IRR, incidence rate ratio; CI, confidence interval; NA, not applicable; ~, IRs and IRRs not calculated for fewer than 16 cases or other/unspecified race; LN, regional lymph nodes; ER, estrogen receptor; PR, progesterone receptor. aLimited to cases with localized/regional stage diagnosed in 1988 or later. bLimited to cases diagnosed in 1990 or later.