We have investigated relative transcript levels of ESPL1, PTTG1 and PTTG1IP in the WBC of 97 CML patients (R, n = 46; NR, n = 51) at the time of ID and of 51 healthy controls by means of qRT-PCR. Here, PTTG1IP is linked to chronic myelogenous leukemia, BCR-ABL1 positive.