Research Study

A Pilot Study Investigating Apixaban and Dexamethasone InterAction in Multiple Myeloma
Principal Investigator 
Agnes Lee


Body Locations and Systems 
Disorders and Conditions 
Multiple Myeloma 
Study Start/End 
Jun 23, 2016 to May 7, 2018
Vancouver General Hospital
Mabel J.Y. Ma, Research Assistant
Email Address
Purpose of Study 

This pilot study will investigate the impact of dexamethasone (DEX) on anti-Xa levels in participants taking apixaban 2.5 mg twice a day by mouth (PO BID). Investigators propose a prospective, cohort study of 24 participants with multiple myeloma, in whom a lenalidomide-dexamethasone (LEN-DEX)-based myeloma treatment regimen is indicated. Eligible participants will initiate thromboprophylaxis with apixaban prior to starting their DEX-containing regimen and continue until the end of cycle 3. Anti-Xa levels, D-Dimer and plasma drug concentration will be measured.

This pilot study looks to investigate this potential interaction between apixaban and dexamethasone to see if it warrants further investigation in a larger study.

The sample size of 24 provides 90% power to detect a primary outcome of ≥ 50% reduction in peak anti-Xa levels from baseline. Secondary outcomes include changes in plasma apixaban levels, D-dimer, and symptomatic venous thromboembolism (VTE) and bleeding during a 3-month treatment period.


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