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Angiogenesis gene linked to biomarkers in breast cancer

Abstracts #29 & 2402
(Embargoed for Release Until Presentation at 3:25 p.m., ET, Monday, March 29, 2004)

Johns Hopkins Kimmel Cancer Center scientists have made what is believed to be the first link between a gene that controls blood vessel growth and increased activity in a panel of breast cancer biomarkers that regulate tumor cell growth.

The HOXB7 (or homeobox B7) gene is thought to drive tumor development by increasing the production of growth factors that affect blood vessel development. The team of Kimmel Cancer Center researchers, led by Saraswati Sukumar, Ph.D., professor of oncology, found increased production of messenger molecules directed by the HOXB7 gene in more than 60 percent of breast cancer cell lines and 90 percent of primary breast cancers. They also found that the gene is important in initiating cancer cells to move from their primary site to metastatic sites. Their microarray data has shown that HOXB7 gene expression is low or undetectable in normal breast tissue, and is expressed at five to seven times higher in primary tumors and up to 20 times higher in bone metastasis.

"We also found that turning on the HOXB7 gene causes overproduction of a family of breast cancer markers called receptor tyrosine kinases," says Sukumar. "So, we believe HOXB7 is important for the early development of breast cancer, and may be a good target for detection and therapeutic tools."

Presentation of Abstract 2402 will be in Room W230 and Abstract 29 will be in Hall B4-D, Orange County Convention Center.


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Contact: Vanessa Wasta
wastava@jhmi.edu
410-955-1287
Johns Hopkins Medical Institutions
29-Mar-2004


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