Trial Outcomes & Findings for Treatment-free Remission After Achieving Sustained MR4.5 on Nilotinib (ENESTop) (NCT NCT01698905)

Recruitment for the study comprised a total of 163 participants, who were enrolled at 63 clinical sites distributed across 18 different countries.. Argentina (2), Australia (3), Belgium (1), Brazil (6), Canada (4), France (5), Germany (5), Greece (3), Israel (3), Japan (7), Mexico (1), Poland (3), Russia (3), Singapore (1), South Korea (1), Spain (8), UK (2), US (5)

Informed consent was obtained from each participant in writing before screening before any study specific procedure was performed.

Treatment-free Remission After Achieving Sustained MR4.5 on Nilotinib (ENESTop)

TFR is defined as no confirmed loss of MR4 (Molecular response 4.0 log reduction from baseline) or loss of MMR (major molecular response) and no re-starting of nilotinib therapy within 12 months following cessation of nilotinib. Confirmed loss of MR4 is two consecutive BCR-ABL \> 0.01% IS. Loss of MMR does not require confirmation.

TFR is defined as no confirmed loss of MR4 (molecular response 4.0 log reduction from baseline) or loss of MMR (major molecular response) and no re-starting of nilotinib therapy within 12 months following cessation of nilotinib. Confirmed loss of MR4 is two consecutive BCR-ABL \> 0.01% IS. Loss of MMR does not require confirmation.

Progression free survival, defined as the time from the date of start of TFR to the date of event defined as the first occurrence of documented disease progression to Accelerated phase/Blast Crises (AP/BC) or the date of death from any cause.

Treatment-free survival defined as the time from the date of start of TFR to the date of earliest occurrence of any of the following events: loss of MMR, confirmed loss of MR4, re-initiation of nilotinib treatment due to any cause, progression to acute phase (AP) or blast crisis (BC) or death due to any cause.

Overall survival, defined as the time from start date of TFR (date of entering the TFR phase) to date of death due to any cause at any time during the study, including the follow-up period after discontinuation of study up to LPLV. If a patient is not known to have died, survival will be censored at the date of last contact.

ABL= Abelson leukemia virus and BCR=Break point cluster region. The BCR-ABL ratio (%) represents the level of BCR-ABL fusion gene transcripts relative to a control gene (ABL) measured in peripheral blood samples using quantitative reverse transcription polymerase chain reaction (RT-PCR). Results are expressed as a percentage on the International Scale (IS), a standardized reporting method that allows comparison across laboratories. The BCR-ABL ratio is used to assess the molecular response to treatment, with lower values indicating a reduced disease burden.

Percentage of participants who were in stable MMR (stable MMR=BCR-ABL ≤ 0.1% IS) at multiple timepoints after achievement of that response in the nilotinib re-initiation phase for those timepoints.

Percentage of participants who were in stable MR4.5 (stable MR4.5=BCR-ABL ≤ 0.0032% IS) at multiple time points after achievement of that response in the nilotinib re-initiation phase for those timepoints.

Percentage of participants who were in stable MR4 (stable MR4=BCR-ABL ≤ 0.01% IS) at multiple timepoints after achievement of that response in the nilotinib re-initiation phase for those timepoints.