February 20, 2007 (Bronx, NY) Researchers at the Albert Einstein College of Medicine of Yeshiva University have discovered a genetic signature identifying cases of lymphoma that are uniquely susceptible to a newly developed molecular targeted therapy. As a result, physicians organizing clinical trials of the new therapy will be able to enroll patients wholl be most likely to benefit from it.
The research was led by Dr. Ari Melnick, assistant professor of developmental & molecular biology and medicine at Einstein, who also developed the new lymphoma therapy. The study appears in the February 20 issue of the Proceedings of the National Academy of Sciences.
Each year more than 60,000 Americans are diagnosed with B cell lymphomastumors of cells of the immune system that include Hodgkins and non-Hodgkins lymphomas. B cells are the immune-system cells that make antibodies. Genetic aberrations can cause B cells to multiply uncontrollably, causing B cell lymphomas.
Dr. Melnicks study focused on a gene called BCL6. The protein it codes for is a transcriptional repressor, which means that it can shut off the functioning of genes in B cells and other cells of the immune system and prevent them from being expressed. The BCL6 protein is normally produced only during a specific stage of B cell development and is never made again. But deregulation of BCL6 can cause the protein to be produced when it shouldnt be. The unwelcome presence of the BCL6 protein blocks the expression of important genes that normally protect cells from becoming cancerous. As a result, malignant B-cell lymphomas occur.
Mutations or chromosomal rearrangements that deregulate BCL6 are responsible for many cases of diffuse large B cell lymphomaan aggressive cancer that accounts for up to 30 percent of newly diagnosed non-Hodgkins lymphoma cases. In a 2004 Nature Medicine article, Dr. Melnick and colleagues described a peptide, which they dubbed BPI, that showed pr
Contact: Karen Gardner
Albert Einstein College of Medicine