The study is a Phase 2, multi-center, open-label, randomized study of asciminib in two different doses (40 mg or 60 mg) in combination with imatinib 400 mg versus continued imatinib versus switch to nilotinib, versus asciminib 80mg single agent in subjects with chronic myeloid leukemia in chronic phase (CML-CP) who have been previously treated with imatinib first line therapy for at least one year and have not achieved deep molecular response (DMR). Eighty-four eligible subjects were randomized 1:1:1:1 to receive asciminib 60 mg once daily (QD) as add-on therapy to imatinib 400 mg QD, or 40 mg QD as add-on therapy to imatinib 400 mg QD, or to continue imatinib 400 mg QD, or to switch to nilotinib 300 mg twice a day (BID).~The asciminib single agent cohort will be conducted as an open label cohort. Approximately 20 eligible subjects will be enrolled to receive asciminib 80 mg QD.~An interim analysis was performed to gain an early insight into the safety and efficacy of the asciminib add-on combination. The interim analysis was planned to be performed when at least 40 (50%) patients have been randomized and have been followed for their 24 weeks visit assessment or have discontinued treatment. The interim analysis cut-off was on 22-July-2020. No change in study conduct were performed based on the benefit/risk balance.~This amendment aims to add an asciminib single agent cohort to assess whether asciminib single agent at the recommended dose of 80mg QD leads to similar efficacy and safety as observed in the add-on arms of asciminib and imatinib. This additional cohort will help to evaluate if the combination of asciminib with imatinib is needed to increase the likelihood of achieving DMR, or if this can be achieved by asciminib alone.~The primary analysis cut-off was on 10-Jan-2022. Eighty-four patients have been randomized in the study.~Subjects on the imatinib continuation arm who had not achieved MR4.5 at 48 weeks were allowed to cross-over (CO) to receive the add-on treatment within 4 weeks after week 48 visit. to receive the asciminib 60 mg combination add-on treatment, as this dose provided higher exposure. The cross-over is at the discretion of the investigator and the patient. Apart from a polymerase chain reaction (PCR) result of below MR4.5 at Week 48 visit, there are no other entry criteria for the cross-over part. Subjects on nilotinib are not allowed to cross- over to receive the add-on treatment.~Subjects on the study will continue on the allocated treatment until treatment failure, intolerability, or for up to 96 weeks (in arms 1 to 4) / or 48 weeks (in asciminib single agent cohort) after the last randomized subject received the first dose of treatment. After the last dose received, every subject will be followed up for safety for 30 days.
To evaluate efficacy, safety and pharmacokinetic profile of asciminib 40mg+imatinib or asciminib 60mg+imatinib versus continued imatinib and versus nilotinib versus asciminib 80mg in pre-treated patients with Chronic Myeloid Leukemia in chronic phase (CML-CP)