Stay Up to Date
Breaking News,
Updates, & More
Click Here to
Subscribe

Final Results of the OPTIM-Imatinib Study in Patients with CP-CML

TOP - February 2016, Vol 9, No 1 - Hematologic Cancers

Imatinib mesylate (IM) at 400 mg/day is the standard of care as first-line therapy in patients with newly diagnosed, chronic-phase chronic myeloid leukemia (CP-CML). Based on evidence that patients with high imatinib trough levels achieved higher rates of major molecular response (MMR), the randomized OPTIM-imatinib trial was conducted to evaluate the value of imatinib dose optimization according to imatinib Cmin levels in newly diagnosed patients with CP-CML.1,2

Based on imatinib Cmin levels, as determined by chromatography–tandem mass–mass spectrometry 15 days after enrollment, patients with a Cmin level <1000 ng/mL were randomized to 2 arms: a dose-increase strategy with dose adjustment every 4 weeks aiming to reach the threshold of 1000 ng/mL (arm A1) versus standard IM management (arm A2); patients with imatinib Cmin levels ≥1000 ng/mL were observed on imatinib 400 mg/day (arm A3).

Of the 133 evaluable patients, 64% showed initial Cmin <1000 ng/mL and were randomized between arms A1 (n = 43) and A2 (n = 43), while the 47 remaining patients with Cmin ≥1000 ng/mL were observed in arm A3. Overall, 36% of patients with Cmin ≥1000 ng/mL are well-dosed with imatinib 400 mg/day. Following dose adjustment in arm A1, there was a significant improvement in median imatinib Cmin compared with standard management in arm A2 (P < .0001). In arm A1, the imatinib daily dose increased to reach a mean value of 600 mg/day, indicating that the majority of patients were not exposed enough to imatinib at standard dose.

The rates of adverse events were similar between arms A1 (58%) and A2 (51%). Treatment discontinuations were also comparable among the 3 arms, reaching 34.1% by 24 months. At 12 months, a higher proportion of patients in arm A1 achieved the primary end point of MMR compared with arm A2 (76% vs 44%; P = .002); however, the MMR rate was numerically lower in arm A2 compared with the standard arm A3 (44% vs 56%).

Based on these results, the authors concluded that individualized dose-adjustment strategies based on pharmacology may be required to optimize the outcome for each patient.

References

1. Larson RA, Druker BJ, Guilhot F, et al. Imatinib pharmacokinetics and its correlation with response and safety in chronic-phase chronic myeloid leukemia: a subanalysis of the IRIS study. Blood. 2008;111:4022-4028.
2. Rousselot P, Johnson-Ansah H, Huguet F, et al. Personalized daily doses of imatinib by therapeutic drug monitoring increase the rates of molecular responses in patients with chronic myeloid leukemia. Final results of the randomized OPTIM imatinib study. Blood. 2015;126:133.

Related Items
Selecting Treatment for Relapsed/Refractory Multiple Myeloma in the Era of Multiple Choices
Meg Barbor, MPH
TOP - January 2020, Vol 13, No 1 published on January 10, 2020 in Hematologic Cancers
What Is the Role of Chemoimmunotherapy in the First-Line Treatment of CLL?
Wayne Kuznar
TOP - January 2020, Vol 13, No 1 published on January 10, 2020 in Hematologic Cancers
Genetic Profiling and Personalized Medicine in Myelodysplastic Syndromes
Meg Barbor, MPH
TOP - January 2020, Vol 13, No 1 published on January 10, 2020 in Hematologic Cancers
November 4, 2019 — Oncology News & Updates
Web Exclusives published on November 5, 2019 in Financial Toxicity, Head and Neck Cancer, Hematologic Cancers, In the News, Leukemia
Educating Your Patients About Daratumumab
Leslie Lauersdorf, ARNP
Conference Correspondent  published on April 18, 2017 in Hematologic Cancers, Conference Correspondent, ASH
How to Handle Survivorship Care for Multiple Myeloma
Tiffany Richards, PhD, ANP-BC
Conference Correspondent  published on April 18, 2017 in Hematologic Cancers, Conference Correspondent, ASH
How to Utilize New Mutliple Myeloma Drugs
Tiffany Richards, PhD, ANP-BC
Conference Correspondent  published on April 18, 2017 in Hematologic Cancers, Conference Correspondent, ASH
Preparing Your Patients for Side Effects
Tiffany Richards, PhD, ANP-BC
Conference Correspondent  published on April 18, 2017 in Hematologic Cancers, Conference Correspondent, ASH
Know Your Patients' Baselines
Tiffany Richards, PhD, ANP-BC
Conference Correspondent  published on April 18, 2017 in Hematologic Cancers, Conference Correspondent, ASH
Meeting the Needs of the Patient
Tiffany Richards, PhD, ANP-BC
Conference Correspondent  published on April 18, 2017 in Hematologic Cancers, Conference Correspondent, ASH
Last modified: July 22, 2021