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Table 10 BRCA promoter methylation percentages in normal breast from BRCA1/2 germline mutation carriers and nonmutation carriers

From: BRCA promoter methylation in sporadic versus BRCA germline mutation-related breast cancers

Probe

BRCA1/2-N, median % (range)

Non-BRCA-related-N, median % (range)

Test statistica

p Value

BRCA1.1

2 (0–3)

3 (0–5)

15.500

0.325

BRCA1.2

17 (13–26)

13 (13–17)

8.500

0.057

BRCA1.3

9 (6–16)

7 (5–8)

8.000

0.050

BRCA2.1

19 (15–26)

16 (14–19)

8.500

0.060

BRCA2.2

8 (6–16)

6 (5–12)

12.000

0.158

BRCA2.3

13 (10–28)

9 (8–14)

6.500

0.031*

BRCA2.4

8 (6–9)

5 (5–6)

2.000

0.005*

  1. Abbreviations: BRCA1/2-N, Normal breast tissue from BRCA1 and BRCA2 germline mutation carriers; Non-BRCA-related-N, Normal breast tissue from patients not known to have a BRCA1 or BRCA2 germline mutation
  2. aMann-Whitney U test for BRCA1/2-N together against non-BRCA-related-N
  3. *Statistically significant (two-sided p value <0.05)