As the expression of dbpB/YB-1 has been well studied in many types of human carcinoma cells (Bargou et al, 1997; Oda et al, 1998; Kamura et al, 1999; Shibao et al, 1999; Gu et al, 2001; Oda et al, 2003), we focused on the expression of dbpA and dbpC in human tumour cells in this report. The gene discussed is YBX1; the disease is carcinoma.