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Perifosine plus lenalidomide and dexamethasone in relapsed and relapsed/refractory multiple myeloma: a Phase I
Andrzej J Jakubowiak1, Paul G Richardson, Todd Zimmerman
1University of Michigan Cancer Center, Ann Arbor, MI, USA. ajakubowiak@medicine.bsd.uchicago.edu
Abstract:
The combination of lenalidomide-dexamethasone is active in multiple myeloma (MM). Preclinical data showed that the Akt inhibitor, perifosine, sensitized MM cells to lenalidomide and dexamethasone, providing the rationale for this Phase I, multicentre, single-arm study to assess the safety and determine the maximum-tolerated dose (MTD) of perifosine-lenalidomide-dexamethasone in relapsed and relapsed/refractory MM. Patients received escalating doses of perifosine 50-100 mg daily and lenalidomide 15-25 mg once daily on days 1-21 of each 28-d cycle, plus dexamethasone 20-40 mg weekly thereafter, as indicated. Thirty-two patients were enrolled across four dose cohorts. MTD was not reached, with 31 patients evaluable for safety/tolerability. The most common all-causality grade 1-2 adverse events were fatigue (48%) and diarrhoea (45%), and grade 3-4 neutropenia (26%), hypophosphataemia (23%), thrombocytopenia (16%), and leucopenia (13%). Among 30 evaluable patients, 73% (95% confidence interval, 57·5-89·2%) achieved a minimal response or better, including 50% with a partial response or better. Median progression-free survival was 10·8 months and median overall survival 30·6 months. Response was associated with phospho-Akt in pharmacodynamic studies. Perifosine-lenalidomide-dexamethasone was well tolerated and demonstrated encouraging clinical activity in relapsed and relapsed/refractory MM.
Insights
The combination of perifosine, lenalidomide, and dexamethasone shows promising activity and good tolerability in patients with relapsed or refractory multiple myeloma (MM). This novel regimen warrants further investigation for MM treatment.
Area of Science:
- Hematology
- Clinical Oncology
- Pharmacology
Background:
- Lenalidomide-dexamethasone is an established active regimen for multiple myeloma (MM).
- Preclinical studies indicated that perifosine, an Akt inhibitor, enhances MM cell sensitivity to lenalidomide and dexamethasone.
Purpose of the Study:
- To assess the safety and determine the maximum-tolerated dose (MTD) of perifosine in combination with lenalidomide and dexamethasone.
- To evaluate the clinical activity of this combination in patients with relapsed and relapsed/refractory multiple myeloma.
Main Methods:
- Phase I, multicenter, single-arm study.
- Escalating doses of perifosine (50-100 mg daily) combined with lenalidomide (15-25 mg daily, days 1-21) and dexamethasone (20-40 mg weekly).
- Thirty-two patients with relapsed/refractory MM were enrolled across four dose cohorts.
Main Results:
- The MTD was not reached; the combination was generally well tolerated.
- Common adverse events included fatigue and diarrhea (grade 1-2), and neutropenia, hypophosphatemia, thrombocytopenia, and leucopenia (grade 3-4).
- Of 30 evaluable patients, 73% achieved a minimal response or better, with 50% achieving a partial response or better. Median progression-free survival was 10.8 months and median overall survival was 30.6 months.
Conclusions:
- Perifosine-lenalidomide-dexamethasone is a well-tolerated regimen.
- The combination demonstrated encouraging clinical activity in relapsed and relapsed/refractory multiple myeloma.
- Response correlated with phospho-Akt levels in pharmacodynamic studies.
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