This is a non-randomized (study drug is intentionally assigned to the patient), single-arm (one group of patients receiving the same treatment), open-label (all people involved know the identity of the intervention) study to evaluate tolerability of the combination therapy of JNS002 and bortezomib in 3 to 6 patients with multiple myeloma whose disease has either progressed after at least 1 line of prior therapy or was refractory to initial treatment. Initially, 3 patients will be enrolled and the incidence of dose limiting toxicity (DLT) will be determined at the end of Cycle 1 to evaluate the study doses against the maximum tolerated dose (MTD). If the incidence is =2/3, additional 3 patients will be enrolled to define the MTD. Safety endpoints include adverse events, laboratory tests (hematology, blood biochemistry, and urinalysis), electrocardiogram (ECG), LVEF, chest X-ray, vital signs (body temperature, pulse rate, and blood pressure), and body weight. Efficacy evaluation will be performed in terms of antitumor effect, according to criteria for assessment of antitumor effect similar to the European Group for Blood and Marrow Transplantation (EBMT) criteria. Bortezomib 1.3 mg/m2 by rapid (bolus) intravenous (IV) administration will be given on Days 1, 4, 8, and 11 of each 21-day cycle. In addition, JNS002 30 mg/m2 by IV infusion will be given at a rate of = 1 mg/minute on Day 4 of every 21-day cycle after bortezomib. Treatment will continue for a total of 6 cycles of therapy (126 days).
The purpose of this study is to evaluate tolerability of the combination therapy of JNS002 and bortezomib in Japanese bortezomib-naive patients with multiple myeloma who have ever received at least 1 line of chemotherapy.