Table 4.

Association between ER status of the first and second breast cancers

First ER−First ER+Total
BRCA1
    Second ER−9913112
    Second ER+131124
    Total11224136
BRCA2
    Second ER−6814
    Second ER+33841
    Total94655
  • NOTE: OR, 6.4; P < 0.0001 (χ2 test) for BRCA1. OR, 9.5; P = 0.002 (χ2 test) BRCA2.