Figure 1 Expression profile of 17 potentially useful molecular markers on 12 breast cancer cell lines. Lanes 1–12: SUM159, SUM52, SUM225, SUM44PE, SUM229, SUM102, MCF7, T47D, ZR‐75‐1, UCT‐Br1, MDA‐MB231, SUM185. All markers were tested at 30 PCR cycles. Cells were cultured, and the RNA extracted and subjected to RT‐PCR analysis for the markers indicted in the right hand column. The left column summarises the number of cell lines positive for each marker.