What are genetic materials that cause cancer?

Abnormalities of the genetic materials are the only known cause of cancer. Errors in DNA replication and heritability of the genetic diseases are the cause of cancer during birth stage. Excessive ultraviolet radiation, any harmful infectious agents, tobacco smokes or chemicals are responsible for the abnormalities of genetic materials. Genes which promote cancer are called oncogenes. They are activated in cancer Cells. Tumor suppressive genes are not activated in the cancer Cells. For that reason programmed cell death and hyper active division and growth of Cells cannot be prevented. Inaccurate DNA replication, irregular Cell cycle, damaging the immune system are the major symptoms of cancer.