Behandlingens virkning blev hovedsagelig bedømt på, hvor mange af patienterne der havde opnået “ major cytogenetisk respons ” (andelen af patientens hvide blodlegemer, som indeholdt Philadelphiakromosomet, var faldet til under 35%).
Its main measure of effectiveness was the proportion of patients who had had a ‘ major cytogenetic response’ (the proportion of the patient’ s white blood cells that contained the Philadelphia chromosome had fallen to below 35%).