( Microscopic examination of tumor specim...)'Signature' of chromosome instability predicts cancer outcomes

Microscopic examination of tumor specimens cannot always predict a cancer's aggressiveness, leading to increased interest in molecular approaches to diagnosis. Now, researchers in the Children's Hospital Informatics Program (CHIP) at the Harvard-MIT Division of Health Sciences and Technology report that a genetic profile indicating chromosomal instability -- an increased tendency to develop chromosomal aberrations, critical in cancer development -- is predictive of clinical outcome in a broad range of cancer types.

Using data on gene expression (activity) from 18 previous studies of cancer, representing six cancer types, they found that this genetic profile, or signature, predicted poor clinical outcome in 12 of the populations studied. The study was published online by the journal Nature Genetics on August 20.

"Chromosomal instability is one of the key mechanisms that keeps malignant cell proliferation going," says Zoltan Szallasi, MD, a CHIP researcher and the study's senior investigator. "We have achieved a relatively easy way to measure the level of chromosomal instability in a given tumor sample."

The technique may help in the search for cancer drugs that reduce chromosomal instability -- an approach of increasing interest to researchers -- by making it possible to screen a large number of drugs for efficacy, Szallasi notes. With further development, the team's work could also form the basis of a diagnostic tool that could be used in the clinic.

The human genome is at constant risk for mutations due to environmental insults, errors in gene replication, and other factors that can cause chromosomes to break and bits of DNA to be lost, duplicated or reshuffled to the wrong chromosomes. Cells have repair mechanisms that constantly fix this damage, but when the repair process breaks down, chromosomes become unstable and cancers are more likely to develop.

Chromosomal instability leads to a condition known as aneuploidy,
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Source:Children's Hospital Boston

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