Every moment your body is undergoing an active process of regeneration, based as it is on the ceaseless flux of cell life and death -- not unlike the dissipative structure of a flame.
Consider the fact that every three days the enterocytes lining the villus of your intestines are completely replaced, and that within 7-10 years, almost every atom and molecule within your body has been excreted, breathed out, or sloughed off, only to be replaced by new ones from the food you ate, the water you drank and the air you breathed in, in the interim.
Truth be told, beneath even the appearance of our solid physio-chemical form, are waves of energy, patterns of vibration (not unlike sound), condensed forms of light, vast voids of inter-atomic space, and subtending that reality from 'below,' an infinite field of possibility, described with awe and elegance by quantum physicists and mystics, alike, albeit with different languages.
Underscoring this amazing interplay of being and non-being, without which life would not be possible, cancer cells are only deadly because they are no longer capable of dying in a well-timed and orderly fashion -- a process of programmed cell death (self-disassembly) known as apoptosis, and shared only by cells healthy enough to die.
The intentional and relatively traceless self-disassembly of the cell, which is associated with apoptosis, exemplifies how the individual cell makes itself holy -- which is the etymology of the word sacrifice ('to make holy') -- by giving itself (one) up selflessly to the whole (many). The word holy, of course, shares etymological kinship with the words 'health' and 'whole,' forming a trinity of meanings which have long ago been forgotten or removed from popular consciousness.
In other words, in order to be whole, healthy and holy, the body and soul can not be treated as separate processes or substances. In cancer, the individual cell breaks its sacred bond with the whole community of cells, i.e. the rest of the body, and proliferates wildly, selfishly on its own; cloning itself tirelessly, in a sort of narcissism which runs against the cellular diversity and cooperative interdependence necessary for their to be ONE, whole functioning healthy being on the macroscopic level.
This "selfish" behavior is to be expected of a cell that has been starved of basic essential nutrients, exposed to a continuous onslaught of synthetic chemicals and manmade electromagnetic fields, given semi-synthetic 'nutrients' and 'vitamins' which no longer share resemblance with anything found in food, and enveloped in an electromagnetically-mediated cocoon of negative emotions, throughout the duration of its life cycle. These cells, like the example of children who suffer profound depravations and abuse earlier in life, learn to grow up with 'body armor,' express 'acting out behavior,' 'selfishness,' and otherwise unhealthy and antisocial characteristics that could be described in an oncologist's histopathological report as the cellular phenotype of cancer.
The ability to survive the constant onslaught of life-denying chemicals and energies has resulted in the down-regulation of genes associated with apoptosis, and the up-regulation of those associated with the tireless metabolic activity and proliferation of cancer. This has lead to the cellular equivalent of the desire for immortality, which is highly unsustainable, and like a virus too deadly to escape the fate of its host, eventually brings down itself in the process, as well.