MMProspective Comparison the Pharmacokinetics of Subcutaneous Versus Intravenous Administration of Bortezomib in Newly Diagnosed Patients of Multiple Myeloma in China.

The new diagnosed multiple myeloma patients are randomized to receive bortezomib by standard intravenous bolus (n=10) or subcutaneous injection (n=10) at the recommended dose and schedule (1.3 mg/m2), days 1, 4, 8, 11;eight 21-day cycles). Patients discontinued treatment due to progressive disease, insufficient efficacy, unacceptable toxicity, or serious protocol violation. Dose modifications are specified for unexpected pharmacokinetic observations or toxicity. Bortezomib-related neuropathic pain and/or peripheral sensory neuropathy were managed using established dose-modification guidelines. Blood samples for pharmacokinetic/pharmacodynamic analysis are collected on days 1 and 11, cycle 1:before bortezomib administration, and at 2, 5, 15, 30, and 60 min, and 2, 4, 6, 10, 24, 32, 48, and 72 hours post-dosing. Pharmacodynamic analyses were performed using a whole-blood 20S proteasome specific activity inhibition assay.