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Johns Hopkins scientists pair blood test and gene sequencing to detect cancer
Date:11/28/2012

needed to determine the best applications of this approach."

The investigators note that there may be less circulating DNA in early stage cancers, and, thus, these would be more challenging to detect without more extensive sequencing. As sequencing costs decrease, the investigators expect that detecting earlier-stage cancers may become more feasible.

Velculescu says that additional research will focus on determining how the new test could help doctors make decisions on treating patients. For example, the blood test could identify certain chromosomal changes that guide physicians to prescribe certain anti-cancer drugs or decide patient enrollment in clinical trials for drugs that target specific gene defects. Currently, physicians use cellular material biopsied from the original tumor to make these decisions, but tumor material can often be inaccessible or unavailable.

The Johns Hopkins study builds on the team's earlier work using genomic sequencing of DNA in the blood to find rearrangements of chromosomes. The previous work required samples of the original tumor and knowledge of DNA changes in that tumor to find those same changes in the blood. This new test has no need for original tumor samples and includes an analysis of changes in the copy number of chromosomes.

"It's an evolution of technologies we're developing for cancer diagnosis, and, by combining our knowledge, we can build better ways to detect disease," says Luis Diaz, M.D., an oncologist and director of the Swim Across America laboratory at Johns Hopkins.


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Contact: Vanessa Wasta
wasta@jhmi.edu
410-614-2916
Johns Hopkins Medicine
Source:Eurekalert

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