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Genetic testing is available to a small number of families at the highest risk of having an inherited predisposition to cancer. Generally, it is necessary to test a person who has had cancer first to identify the genetic change causing cancer in the family. If a genetic change is found, it confirms that the cancers in that family are due to an inherited predisposition to cancer.Blood relatives who have no signs of cancer can then choose to have testing to find out if they have inherited the altered gene that has been identified and could increase their risk of developing specific types of cancer. If they have inherited a predisposition to cancer, the Familial Cancer Centre will develop a personal program designed to manage their risk.If a genetic change cannot be found in a person affected by cancer, it remains possible that there is still a genetic predisposition to cancer in the family. Unfortunately not all genetic changes can be detected. The Familial Cancer Centre would advise family members about the chance of developing cancer and what they can do to reduce the risk.Genetic testing is arranged by the Familial Cancer Centre and is offered only with counselling both before and after the test to discuss its limitations as well as potential benefits.