The ubiquitous expression of the dbpB/YB-1 gene in human normal and neoplastic tissues has been well studied and found to be closely associated with the expression of p-glycoprotein, the product of the multidrug resistance 1 (MDR1) gene, in breast cancers (Bargou et al, 1997), osteosarcomas (Oda et al, 1998), ovarian cancers (Kamura et al, 1999), and synovial sarcomas (Oda et al, 2003). Here, ABCB1 is linked to breast carcinoma.