The drug resistant cell line MOR/0.2R has been derived from the parent line, MOR, by continuous exposure to increasing concentrations of doxorubicin (also known as adriamycin). MOR/0.2R accumulate lower levels of doxorubicin than the parent line and have been shown to overexpress multi drug resistance associated protein (MRP). Expression of a 190kDa membrane protein associated with the degree of drug-resistance has been indicated. Cells grow as easily detaching aggregates.