According to Wikipedia:
Cancer epigenetics is the study of epigenetic modifications to the genome of cancer cells that do not involve a change in the nucleotide sequence. Epigenetic alterations are as important as genetic mutations in a cell’s transformation to cancer.[1] Mechanisms of epigenetic silencing of tumor suppressor genes and activation of oncogenes include: alteration in CpG island methylation patterns, histone modifications, and dysregulation of DNA binding proteins. Understanding epigenetic mechanisms holds great promise for cancer prevention, detection, and therapy.
If this explanation was too complicated for you, as it was for me (Science, biology and all related fields were never my strong point),  I have another definition by the person who discovered epigenetics. Author Dr. Bruce H. Lipton, a former medical school professor and research scientist breaks it down in simpler terms, “Genes and DNA do not control our biology. DNA is controlled by signals from outside the cell, including the energetic…
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