The neoplasia is the result of an alteration in the multiplication or abnormal proliferation in a specific tissue, this differentiation ends in the form of a mass or tumor; In other words, a neoplasm consists of the formation of a totally dysfunctional mass that does not belong to the tissue where it is found, which is why it is classified as abnormal and is a product of poor replication in a certain type of cells. The multiplication of tumor-forming cells is totally uncoordinated and disorganized, it does not comply with the basic principles given by the organisms that control cell replication in all tissues.
These tumors, after they have been created or originated, will continue to grow progressively even if the need for the factor that stimulated them from the beginning, this occurs because cells that replicate abnormally do not occur with the apoptosis process (programmed cell death) does not cease to exist, one cell layer continues to grow and proliferate over the other, which is responsible for the enlargement of the aforementioned mass. Neoplasms are popularly referred to as "cancer", this is thanks to the scientist Ambroise Paré, who for the first time gave a conceptualization of cancer in the following way: tumor with a lot of hardness, irregular appearance, with a spherical shape lacking uniformity, which does not have mobility, generally presents a gray or ash color and is surrounded or encapsulated by numerous blood lines totally loaded with blood, for which these lines have a grotesque appearance (like the feet of a crab).