- Most colorectal tumors (95%) are adenocarcinomas, which originate as a benign, adenomatous polyp in the rectum or colon.
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- Cancer of the cervix, predominantly squamous cell carcinoma (90% of cases). The remaining 10% are adenocarcinomas and are thought to be related to in utero exposure to diethylstilbestrol.
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- A cellular malignancy in which the affected cell displays unregulated growth and division and lack of differentiation as it invades adjacent tissues and proliferates. The altered cells, which form solid or diffuse tumors, are classified by the tissue from which they arise and are described according to a histogenetic system.
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- Ductal carcinomas account for 75% of all breast cancer; lobular and nipple carcinomas account for most of the remaining 25%.
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- An expanding, intracranial lesion that may be either benign or malignant. However, since both types can be lethal if inaccessible or left untreated, and since malignant tumors rarely metastasize beyond the central nervous system, the distinction serves mainly to describe the rate of growth and invasiveness. Tumors are divided into six classes, according to their origin: (1) skull, (2) meninges, (3) cranial nerves, (4) neuroglia, (5) pituitary/pineal body, and (6) congenital.
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