Cancer is a category of diseases characterized by out-of-control cell growth. There are various types of cancer, and each is classify by the type of cell that is primarily affected. Cancer is a circumstance which arises while a cell starts disobeying the check mechanisms, which control the rate of cell proliferation and starts dividing in an uncontrolled manner. This leads to the formation of a neoplastic tumor, which is normally benign at this stage, but becomes malignant, when it starts metastasizing, i.e. starts spreading to other tissues.
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