Yes. Cancer is actually just damaged cells. Damage occurs from something as simple as blunt force trauma to ionizing radiation (EM wavelengths at or above UV light). The benign damaged cells divide and produce normal healthy daughter cells, whereas damaged cells that produce the same damage when they divide is sometimes malignant IF they lose contact inhibition and lose their telomere chain. Your immune cells will tag these damaged cells and macrophages envelop and breakdown the damaged cells before they can multiply. If your immune system is healthy and the number of defective cells are not too numerous, your body destroys the cancer cells in the normal course of business. If your immune system suffers a weakening or the number of damaged cells outnumber your ability to dispose of them faster than they can divide, cancerous cells can go from being under control to overwhelming your body and causing sickness and death. The keys to avoiding cancer are to minimize damage to cells, {especially ionizing radiation, toxic chemical exposure (especially over long periods of time)} , and a healthy immune system.