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By the degree of invasion, a cancer can be classified as in situ when malignant cells are present as a tumor but have not metastasized, or invaded beyond the layer or tissue type where it arose. For example, a cancer of epithelial origin with such features is called carcinoma in situ, and is defined as not having invaded beyond the basement ...
Warburg regarded the fundamental difference between normal and cancerous cells to be the ratio of glycolysis to respiration; this observation is also known as the Warburg effect. In the somatic mutation theory of cancer, malignant proliferation is caused by mutations and altered gene expression, in a process called malignant transformation ...
The following is a list of cancer types. Cancer is a group of diseases that involve abnormal increases in the number of cells , with the potential to invade or spread to other parts of the body. [ 1 ]
Symptoms of cancer metastasis depend on the location of the tumor. When cancer begins, it produces no symptoms. Signs and symptoms appear as the mass grows or ulcerates. The findings that result depend on cancer's type and location. Few symptoms are specific. Many frequently occur in individuals who have other conditions.
The process that occurs to form or produce a neoplasm is called neoplasia. The growth of a neoplasm is uncoordinated with that of the normal surrounding tissue, and persists in growing abnormally, even if the original trigger is removed. [3] [4] [5] This abnormal growth usually forms a mass, which may be called a tumour or tumor. [6]
Another way to tell the difference is color. Sunspots will get darker in the summer, as they are exposed to more sun, and will lighten in the winter. Sunspots will never be black, however ...
Cancer cells are created when the genes responsible for regulating cell division are damaged. Carcinogenesis is caused by mutation and epimutation of the genetic material of normal cells, which upsets the normal balance between proliferation and cell death. This results in uncontrolled cell division in the body.
Symptomatology (also called semiology) is a branch of medicine dealing with the signs and symptoms of a disease. [ 54 ] [ 55 ] [ 56 ] This study also includes the indications of a disease . [ 57 ] It was first described as semiotics by Henry Stubbe in 1670 a term now used for the study of sign communication .