Table 1.

Imatinib-Resistant Clones From K562 Cells Cultured in the Presence or Absence of Epo

Cells/well seededWells With Proliferating Imatinib-Resistant Cells (per Dish of 96 Wells)
ImatinibImatinib/Epo
3000044
047
6000154
160
Frequency of resistance (×10−6)∼1.7159 ± 9