What are proto-oncogenes, tumor suppressor genes, DNA repair genes, and genes regulating apoptosis? What is their role in the development of neoplasms? How does the body defend itself against abnormal...

What are proto-oncogenes, tumor suppressor genes, DNA repair genes, and genes regulating apoptosis? What is their role in the development of neoplasms?

How does the body defend itself against abnormal cells that arise spontaneously in the course of cell division? What is the consequence of failure of these defense mechanisms?