Kidney tumors have a mind of their own

New research has found there are several different ways that kidney tumours can achieve the same result – namely, grow.

Scientists have been trying to figure out how different people have kidney tumours with the same histology, or shape, although the genetic changes can vary among individual tumours.

Solving that puzzle could have implications for the diagnosis and treatment if kidney cancer, which has 35 per cent mortality rate and is becoming more common. Despite advances in early detection and treatment, the mortality rate hasn't changed in decades.

For the first time, researchers at St. Michael's Hospital have looked at multiple different levels of changes at the same time. Dr. George Yousef, a laboratory pathologist, said researchers have looked at three different ways cancer cells can grow and survive:

• the tumour can amplify (or replicate) its chromosomes, the packages of DNA and proteins found in cells

• the tumour can alter a process that controls the on-off switch for genes needed for cell growth and differentiation, known as methylation

• or the tumour can drive gene activation through another gene

Dr. Yousef said they found that looking at all these changes in the same setting simultaneously can provide a much better understanding of tumour behaviour and how the apparently different changes can produce the same results.

His research appears in the journal Cancer Research, one of the leading journals of in the field of cancer.

Using a high resolution microarray there were also able to identify very specific regions of the chromosomes where genetic alterations happen in kidney cancer to a much higher resolution than before. Combining information from chromosomal changes, methylation and gene expression provided a much clearer understanding of the mechanism of kidney cancer development.

"Now we look at the mechanism rather than the individual change," Dr. Yousef said. "Regardless of the apparent differences of the tumour, the outcome will be the same. Eventually, we may be able to target treatment based on the 'mechanism' that is affected rather than the individual genes that are changed."

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About St. Michael's Hospital

St. Michael's Hospital provides compassionate care to all who enter its doors. The hospital also provides outstanding medical education to future health care professionals in more than 23 academic disciplines. Critical care and trauma, heart disease, neurosurgery, diabetes, cancer care, and care of the homeless are among the Hospital's recognized areas of expertise. Through the Keenan Research Centre and the Li Ka Shing International Healthcare Education Center, which make up the Li Ka Shing Knowledge Institute, research and education at St. Michael's Hospital are recognized and make an impact around the world. Founded in 1892, the hospital is fully affiliated with the University of Toronto.