A Study of REduction And DIscontinuation Treatment of TKI (Imatinib, Nilotinib, Dasatinib and Bosutinib)

Phase 2

Active, not recruiting

• Conditions: Chronic Myeloid Leukemia; Chronic Myeloid Leukemia in Remission; BCR-ABL Positive Chronic Myelogenous Leukemia
• Interventions: Drug: Imatinib; Drug: Nilotinib; Drug: Dasatinib; Drug: Bosutinib

• Registration Number: NCT04578847
• Lead Sponsor: National Research Center for Hematology, Russia

Brief Summary

The main goal of this study is to evaluate the stability of molecular response (major and deep molecular response( MMR and DMR)) in patients with chronic myeloid leukemia (CML) with stable DMR after two-stage dose reduction phase and discontinuation treatment TKI: imatinib, nilotinib, dasatinib and bosutinib.

Detailed Description

The duration of the dose reduction phase will be 12 months. This phase will have two stage of 6 months, respectively.

The dose of imatinib, nilotinib, dasatinib or bosutinib will be reduced by 25-50% on the first stage, and by another 25% on the second stage.

* The initial dose of imatinib will be 400 mg daily. The dose will be reduced by 300 mg daily on the first stage, by 200 mg daily - on the second stage.

* The initial dose of nilotinib will be 300 or 400 mg twice daily. The dose will be reduced by 400 mg daily on the first stage, by 200 mg daily - on the second stage.

* The initial dose of dasatinib will be 100 or 140 mg daily. The dose will be reduced by 50 mg daily on the first stage, by 25 mg daily - on the second stage.

* The initial dose of bosutinib will be 500 mg daily. The dose will be reduced by 300 mg daily on the first stage, by 200 mg daily - on the second stage.

All patients with stable deep molecular response (at least 2 years) will be included in treatment free remission phase (TFR-phase). The duration of TFR-phase will be 24 months.

The CML patients can enter the study already on reduced doses TKI, if they will meet the inclusion criteria.

It is possible to include patients, who have already received therapy with reduced doses of TKI. The duration of TKI therapy with reduced doses of 1 stage should be at least 6 months, if TKI doses meet of stage 1. The duration of TKI therapy with reduced doses of 2 stage should be for at least 6 months and the general duration of TKI therapy with reduced doses should be for at least 12 months, if TKI doses meet of stage 2.

Study Timeline

• Study Start: 2020-01-15
• Study First Submitted: 2020-03-05
• Status Verified: 2020-10
• Study First Submitted QC: 2020-10-01
• Last Update Submitted: 2020-10-01
• Study First Posted: 2020-10-08
• Last Update Posted: 2020-10-08
• Primary Completion: 2025-01-15
• Study Completion: 2025-01-15

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 100

Inclusion Criteria

1. CML in chronic phase.
2. TKI treatment for at least 3 years.
3. DMR (BCR-ABL≤0.01%) for at least 1 year, MMR (BCR-ABL≤0.1%) for at least 2 years
4. At least 3 molecular results over the preceding 24 months, which confirm the presence of MMR and DMR
5. Written Informed Consent
6. CML patients with DMR for at least 1 years and MMR for at least 2 years after STOP TKI in anamnesis.

For patients who are on the reduced dose TKI (1 stage) at the time of inclusion in the study

1. The duration of therapy at reduced doses of TKI phase I is at least 6 months.

For patients on the reduced dose TKI (2 stage, before TFR phase) at the time of inclusion in the study

1. DMR (BCR-ABL≤0.01%) for at least 2 years
2. The duration of therapy at reduced doses of TKI phase 1 is for at least 6 months, the total duration of therapy at reduced doses is for at least 12 months.

Exclusion Criteria

1. Age under 18
2. ECOG >2
3. CML in accelerated phase or blast crisis at any time
4. Lack of Written Informed Consent
5. Pregnant or lactating women
6. Incapacity

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
The TKI dose reduction	Bosutinib	Imatinib, nilotinib, dasatinib or bosutinib; the two stage of TKI dose reduction phase for 12 months (6 months and 6 months, respectively).
The TKI dose reduction	Nilotinib	Imatinib, nilotinib, dasatinib or bosutinib; the two stage of TKI dose reduction phase for 12 months (6 months and 6 months, respectively).
The TKI dose reduction	Imatinib	Imatinib, nilotinib, dasatinib or bosutinib; the two stage of TKI dose reduction phase for 12 months (6 months and 6 months, respectively).
The TKI dose reduction	Dasatinib	Imatinib, nilotinib, dasatinib or bosutinib; the two stage of TKI dose reduction phase for 12 months (6 months and 6 months, respectively).

Primary Outcome Measures

Name	Time	Method
Overall survival, survival without molecular relapse	37 months

Secondary Outcome Measures

Name	Time	Method
The proportion of patients with molecular relapse who achieved MMR and DMR after the resumption TKI therapy in standard doses	37 months
Clinical factors, that affect the preservation of MMR after TKI dose reduction and discontinuation of therapy TKI.	37 months	sex (male, female)
Biological factor, that affect the preservation of MMR after TKI dose reduction and discontinuation of therapy TKI.	37 months	Molecular response at the time of inclusion in the study
The proportion of patients who resolved the adverse events after TKI dose reduction and discontinuation of TKI therapy	37 months
The proportion of patients who have TKI withdrawal syndrome after TKI dose reduction and discontinuation of TKI therapy.	37 months
Clinical factor, that affect the preservation of MMR after TKI dose reduction and discontinuation of therapy TKI.	37 months	duration of previous TKI treatment

Trial Locations

Locations (1)

National Research Center for Hematology; 🇷🇺 Moscow, Russian Federation