On the other hand, genetic or environmental factors may play a role.

Genetic and environmental factors are thought to play a part.

Genetic factors or health problems the child had before the cancer.

More than half of these cases are caused by genetic factors.

All risk information is based only on discovered genetic factors.

There is good evidence that in some women genetic factors are important.

The results of this study found that the only significant genetic factor was the person's blood type.

It could be that in 30 to 80 percent of cases there is an important genetic factor.

They can also use the blood samples to look for genetic factors.

The weight of a person is also determined by genetic factors.