Most people with HNPCC inherit the condition from a parent. However, due to incomplete penetrance, variable age of cancer diagnosis, cancer risk reduction, or early death, not all people with an HNPCC gene mutation have a parent who had cancer. Some people develop HNPCC de-novo in a new generation, without inheriting the gene. These people are often only identified after developing an early-life colon cancer. Parents with HNPCC have a 50% chance of passing the genetic mutation on to each child. It is also important to note, that deleterious mutation in one of MMR genes alone is not sufficient to cause cancer, but that rather further mutations in other tumour suppressor genes need to occur.