About cancer, everyone knows that this disease is about mutant cells and its spread through all body. However, there is an old research believes that there is another source can lead to cancer. It was called the epigenetic alteration. The study showed that "epigenetic changes – which don’t change the DNA sequence but how it is ‘read'." This issue does not change or mutate any gene in the DNA sequence, but it acts like a switch off to inactivate any particular gene; the gene is turned off can affect to the function of other companies.