A Phase III Multi-center, Open-label, Randomized Study of Imatinib Versus Nilotinib in Adult Patients With Newly Diagnosed Philadelphia Chromosome Positive (Ph+) Chronic Myelogenous Leukemia in Chronic Phase (CML-CP)
A Phase III Multi-center, Open-label, Randomized Study of Imatinib Versus Nilotinib in Adult Patients With Newly Diagnosed Philadelphia Chromosome Positive (Ph+) Chronic Myelogenous Leukemia in Chronic Phase (CML-CP)
In this study, the efficacy and safety of two nilotinib doses, 300 mg twice daily and 400 mg twice daily, were compared with imatinib 400 mg once daily in newly diagnosed patients with Philadelphia chromosome-positive (Ph+) Chronic Myelogenous Leukemia in the chronic phase (CML-CP).
An extension protocol was included in this study design to allow patients who did not show sufficient response to their assigned treatments the opportunity to receive imatinib 400 mg BID (option available until protocol amendment 7) or nilotinib 400 mg BID, using an abbreviated safety and efficacy assessment schedule.
Primary objectives of this study:
The Primary objectives of Extension Phase of the study:
- Characterized the safety and tolerability profile of nilotinib 400 mg BID after failure of imatinib or insufficiently responded to nilotinib 300 mg BID therapy and the safety and tolerability profile of imatinib therapy after failure of nilotinib therapy.
The study was designed to determine whether the treatment of newly diagnosed, previously untreated Ph+ CML-CP patients with either nilotinib 300 mg bid or 400 mg bid demonstrated improved efficacy compared to imatinib 400 mg qd. The primary efficacy endpoint was the rate of MMR defined as the proportion of patients who achieved ≥ 3 log reduction in BCR-ABL transcripts compared to either the standardized Baseline established in the IRIS trial (International Randomized Interferon versus STI571) (Cortes et al 2005) or to the BCR-ABL ratio ≤ 0.1% by International Scale, as detected by real-time quantitative polymerase chain reaction (RQ-PCR) at 12 months.
The key secondary endpoint was to compare the rate of durable MMR between nilotinib 300 mg bid with that of imatinib, and of nilotinib 400 mg bid with that of imatinib at 24 months. This report presents the final results of efficacy and safety at the LPLV (21-Aug-2019).
The main data analysis was done at the time when all patients completed 12 cycles of treatment (or discontinued earlier). There were two primary comparisons at this time point: the MMR rate of nilotinib 400 mg versus the MMR rate of imatinib 400 mg, and the MMR rate of the nilotinib 300 mg versus the MMR rate of the imatinib 400 mg. Comparisons were done sequentially, i.e. the MMR rate of nilotinib 400 mg versus the MMR rate of imatinib 400 mg was to be compared first; if it was significant at 5% level, the MMR rate of the nilotinib 300 mg versus the MMR rate of the imatinib 400 mg was to be compared. The study had a 90% power to detect a 15% difference between the nilotinib 400 mg arm versus imatinib 400 mg arm assuming that the MMR rate of imatinib is 40% and the MMR rate of nilotinib is 55%. The study also had a 90% power to detect a 15% difference between the nilotinib 300 mg and the imatinib 400 mg arms, if the comparison between the nilotinib 400 mg and the imatinib 400 mg was significant.
The second main data analysis was done at the time when all patients completed 24 cycles of treatment (or discontinued earlier). There were two key comparisons at this time point: the rate of durable MMR at 24 months of the nilotinib 400 mg versus the imatinib 400 mg, and the rate of durable MMR at 24 months of the nilotinib 300 mg versus the imatinib 400 mg.
In order to control the overall type I error rate at or below 5%, only when the corresponding comparison on the primary efficacy endpoint(s) was (were) significant, the key secondary comparison(s) of the respective nilotinib doses (400 mg bid and/or 300 mg bid) versus imatinib 400 mg qd were tested at two-sided 5% significance level.
Patients participating after demonstrating suboptimal response/treatment failure to their assigned study treatment in the core study were offered the option to continue in the extension study and to receive imatinib 400 mg bid (option available only until protocol amendment 7) or nilotinib therapy at a dose of 400 mg bid.
Key Inclusion criteria:
Key Exclusion criteria:
Los Angeles, California 90095, United States
San Diego, California 92120, United States
Vallejo, California 94589, United States
Beech Grove, Indiana 46107, United States
Iowa City, Iowa 52242, United States
New Orleans, Louisiana 70115, United States
Lansing, Michigan 48824, United States
St Louis, Missouri 63136, United States
Hackensack, New Jersey 07601, United States
New York, New York 10021, United States
Chapel Hill, North Carolina 27514, United States
Winston-Salem, North Carolina 27157, United States
Cincinnati, Ohio 45219, United States
Chattanooga, Tennessee 37404, United States
San Antonio, Texas 78229, United States
CABA, Buenos Aires C1221ADC, Argentina
Bogota, Cundinamarca 110111, Colombia
HUS Helsinki, FIN-00029, Finland
Saint Priest En Jarez, Pays de la Loire Region 42270, France
Bunkyo Ku, Tokyo 113 8655, Japan
Bunkyo-ku, Tokyo 113-8519, Japan
Chuo Ku, Tokyo 104 0045, Japan
Shinagawa Ku, Tokyo 141 8625, Japan
Shinjuku-ku, Tokyo 160 8582, Japan
Shinjuku-ku, Tokyo 160-0023, Japan
Jeollanam-do, Jeollanam-do 519763, South Korea