Unfortunately, cancer is common, and in the majority of cases is not inherited. As many as 1 in 2 people will develop cancer in their lifetime. That is 50% of the world’s population.
Most cancers are not inherited and occur out sporadically or ‘out of the blue’.
Lynch syndrome makes certain (not all) cancer types more likely to develop. This is due having less protection from the cancer mismatch repair genes. This doesn’t mean that you will definitely develop cancer, but having less protection makes it more likely.
The way Lynch syndrome behaves in you and your family can be very different as the affected Lynch syndrome genes interact with other genes as well. Family history should be taken into consideration, but each family member will be affected differently.
Lynch Syndrome Ireland 