The modern theory of cancer
The List Of Diseases / / August 12, 2017
Currently, there is a belief that the vast majority of cancer diseases are unequivocal, though not always well-known reasons: the different types of radiation, the body contact with certain chemicals, certain viral infections, repeated mechanical irritation.
It is believed that the appearance of cancer - a two-step process.The impact of adverse external factors leading to the so-called initiation or occurrence of "sleeping" transformed, the actual cancer cells in the body, the effect of which, however, should not occur immediately.This "sleeping" the changed cell (or group of cells) can exist in the body for a long time (ten, fifteen or more years) without symptoms of the disease.But some other impulse, external or internal (mental stress, certain viral diseases, receipt of any chemicals in the body, endocrine balance, such as puberty, reduced resistance of the organism, in particular as a result of malnutrition, weakening of the immune responseand so on. n.) can cause expression when "sleeping" transfo
Today, the occurrence of cancer is considered as a multi-component disease;it is necessary for the manifestation of the interaction of a number of factors, sometimes improbable.As we consider the chemical carcinogenesis, t. E. The occurrence of cancer by chemicals, the focus is mainly on them, even when we can talk about the interaction of a wide variety of external and internal factors (radiation, disease, genetic influences, food, changes in the immunereaction of the body, and many others).Rarely chemicals affect the body in isolation.In most cases we are talking about a complex action of a number of substances, such as entering the body from the outside (along with food, water, medicines) and formed in him (hormones, various enzymes, salons, components of immune defense).In principle, the effect of two different carcinogenic substances may be additive, antagonistic, when it is mutually weakened or sinergeticheskim, t. E. As a result of intensifying interaction.
Similarly, the effect of any foreign, but non-cancer agents to the occurrence of cancer caused by chemical, may occur in the body in three ways: either the substance does not interfere in the action of a carcinogen or inhibits (inhibitor) or increases it (promoter, carcinogen).Of these groups deserve special attention inhibitors.It is believed that these substances reception people exposed to cancer factors could be, at least to a certain extent and before the commencement of some substances to protect them from disease.In this regard worldwide intensively studied the action of a number of vitamins (vitamin A and its derivatives, retinoids, vitamin C in very large doses) or minerals (magnesium, selenium).From the standpoint of preventing cancer finding effective inhibitors would have, of course, of great importance.