The most common type and the one we usually talk about is sporadic cancer:
- It appears as individual cases, is unpredictable and, even when it affects more than one person in a family, is not hereditary.
Environment + genetics
Sporadic cancer tends to appear later in life, usually around the age of 60-70, and results from a buildup of mutations throughout the years.
It is caused by exposure to environmental risk factors, but also by the person’s genetic blueprint, which can increase his/her vulnerability to the risk factors.
An example of an environmental risk factor, in this case for lung cancer, is smoking.