After cycle 1, the start of treatment in each cycle may occur within a 3-day window. In addition, after cycle 2, the start of treatment in cycle 3 may be delayed by 1 week if, in the opinion of the investigator, the delay is warranted. If a participant cannot receive 75% of the planned dose for any of the 3 agents (missing more than 1 dose of CEP-18770, or more than 5 doses of lenalidomide [either consecutively or separately], or more than 1 dose of dexamethasone [either consecutively or separately]), due to a drug-related adverse event, the event will be considered a dose limiting toxicity (DLT), even if the grade of toxicity is lower than specified DLT determination. Participants will receive intravenous (IV) CEP-18770 on Days 1, 8, and 15, oral lenalidomide on days 1 through 21, and oral dexamethasone on days 1, 8, 15, and 22 of each 28-day cycle. Treatment with all 3 drugs will continue for up to 12 cycles (approximately 11 months), or until disease progression or intolerable toxicities. Participants experiencing clinical benefit may continue to receive additional treatment at the investigator's discretion and following sponsor notification. In part 2 of the study, participants will receive CEP-18770 as a slow IV bolus (approximately 1 milliliter per minute) at the maximum tolerated dose on days 1, 8, and 15 of every 28-day cycle. Participants who complete or discontinue study drug treatment and whose disease has not progressed will have study visits every 7-9 weeks during follow-up until disease progression, death, or until they have been monitored for 1 year after the first administration of study drug, whichever occurs first.
The primary objective of the study is to determine the maximum tolerated dose (MTD) of CEP-18770 in combination with lenalidomide and dexamethasone in participants with relapsed or refractory multiple myeloma.