BRCA1 and breast cancer: BACH1 (BRCA1-associated C-terminal helicase 1, also known as BRCA1-interacting protein 1, BRIP1; GenBank: NM_032043) belongs to a DEAH helicase family and interacts in vivo with BRCA1, the protein product of one of the two major genes for hereditary breast cancer susceptibility [1,2].