Resistens over for imatinib inkluderede manglende fuldstændig hæmatologisk respons (ved 3 måneder), cytogenetisk respons (ved 6 måneder) eller større cytogenetisk respons (ved 12 måneder) eller sygdomsprogression efter en tidligere cytogenetisk eller hæmatologisk respons.
Resistance to imatinib included failure to achieve a complete haematological response (by 3 months), cytogenetic response (by 6 months) or major cytogenetic response (by 12 months) or progression of disease after a previous cytogenetic or haematological response.