COR-L23/5010 has been derived from the parent line, COR-L23 by continuous exposure to increasing concentrations of doxorubicin (also known as adriamycin). The cells overexpress multidrug resistance-associated protein (MRP) and express a 190kDa membrane-protein connected to the degree of drug-resistance. COR-L23/5010 have a higher resistance than COR-L23/R.