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In the lab and clinic, VCU Massey develops a new therapy for blood cancers
Date:6/2/2011

Richmond, Va. (June 2, 2011) Clinical researchers at VCU Massey Cancer Center have successfully completed a Phase I clinical trial evaluating a combination of the drugs Bortezomib and Alvocidib in patients with relapsed or refractory blood cancers, paving the way for a Phase II clinical trial to test the safety and effectiveness of the new therapy.

Reported in the journal Clinical Cancer Research, the study determined the maximum tolerated dose with acceptable side effects for this novel drug combination. The trial represented the first time a proteasome inhibitor such as Bortezomib was combined with a cell cycle inhibitor such as Alvocidib to treat patients with cancer.

Proteasome inhibitors work by blocking the action of proteasomes, which are large protein complexes that help destroy proteins that are no longer needed by the cell. Cell cycle inhibitors disrupt the sequence of events that allow cells to undergo cell division and duplication. They also have the ability to block gene transcription.

The trial included 16 patients who had either indolent (non-aggressive) non-Hodgkin's lymphoma, mantle cell lymphoma or multiple myeloma. After they received the treatments over a 21-day cycle, there were two complete responses, meaning that all detectable traces of the cancer were gone, and five partial responses.

"Therapeutic responses tend to be rare in Phase I trials, but 44 percent of our patient sample responded to the therapy. Interestingly, some patients who previously had no response to Bortezomib, or progressed after Bortezomib therapy, responded to the combination," says Beata Holkova, M.D., a hematologist-oncologist at VCU Massey and co-investigator on this clinical trial. "Because of the small patient sample size, we can't draw definitive conclusions about the effectiveness of the therapy, but we were quite encouraged by the results."

The patients received Bortezomib intravenously on days 1, 4, 8 and 11 an
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Contact: John Wallace
wallacej@vcu.edu
804-628-1550
Virginia Commonwealth University
Source:Eurekalert

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