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 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 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 happen in kidney cancer to a much higher resolution than before. Combining information from chromosomal changes, methylation and provided a much clearer understanding of the mechanism of 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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