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tissue composed of cells that grow in an abnormal way. Normal tissue is growth-limited, i.e., cell reproduction is equal to cell death. Feedback controls limit cell division after a certain number of cells have developed, allowing for tissue repair but not expansion. Tumor cells are less responsive to these restraints and can proliferate to the point where they disrupt tissue architecture, distort the flow of nutrients, and otherwise do damage.

Tumors may be benign or malignant. Benign tumors remain localized as a discrete mass. They may differ appreciably from normal tissue in structure and excessive growth of cells, but are rarely fatal. However, even benign tumors may grow large enough to interfere with normal function. Some benign uterine tumors, which can weigh as much as 50 lb (22.7 kg), displace adjacent organs, causing digestive and reproductive disorders. Benign tumors are usually treated by complete surgical removal. Cells of malignant tumors, i.e., cancerscancer,
in medicine, common term for neoplasms, or tumors, that are malignant. Like benign tumors, malignant tumors do not respond to body mechanisms that limit cell growth.
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, have characteristics that differ from normal cells in other ways beside cell proliferation. For example, they may be deficient in some specialized functions of the tissues where they originate. Malignant cells are invasive, i.e., they infiltrate surrounding normal tissue; later, malignant cells metastasize, i.e., spread via blood and the lymph system to other sites.

Both benign and malignant tumors are classified according to the type of tissue in which they are found. For example, fibromas are neoplasms of fibrous connective tissue, and melanomas are abnormal growths of pigment (melanin) cells. Malignant tumors originating from epithelial tissue, e.g., in skin, bronchi, and stomach, are termed carcinomas. Malignancies of epithelial glandular tissue such as are found in the breast, prostate, and colon, are known as adenocarcinomas. Malignant growths of connective tissue, e.g., muscle, cartilage, lymph tissue, and bone, are called sarcomas. Lymphomas and leukemiasleukemia
, cancerous disorder of the blood-forming tissues (bone marrow, lymphatics, liver, spleen) characterized by excessive production of immature or mature leukocytes (white blood cells; see blood) and consequently a crowding-out of red blood cells and platelets.
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 are malignancies arising among the white blood cells. A system has been devised to classify malignant tissue according to the degree of malignancy, from grade 1, barely malignant, to grade 4, highly malignant. In practice it is not always possible to determine the degree of malignancy, and it may be difficult even to determine whether particular tumor tissue is benign or malignant.


An aberrant new growth of abnormal cells or tissues; a tumor.
References in periodicals archive ?
Basyle Boz Tchividjian founder of GRACE said, GRACE is so excited to begin working with New Growth Press in developing and publishing resources that will transform our faith communities into the safest places for children and those who have suffered from abuse.
The operation of pruning not only modifies the shape and character of a plant but it also stimulates new growth if weather conditions are favorable.
Among the changes are the appointment of a new chief operating officer and the realignment of two of the company's growth platforms into two new growth platforms--Technology and Business Process Outsourcing.
We hope that the new growth charts will encourage mothers to initiate and continue breastfeeding.
RE-SHAPE hedges to promote new growth and to encourage plants to shoot from the bottom.
Living in the Pacific Northwest, having come three years ago from the level Midwest, I see what great damage a fire can do--and what new growth can come from such a blaze
Even with the knowledge of this new growth factor, Alexander Ball of McMaster University in Hamilton, Ontario, notes that completely regenerating damaged axons to their preinjury state is a "tall order.
In addition, strong profit growth was recorded in the two remaining segments - Other and The Americas - which we view as new growth areas for the future.
Frost & Sullivan, London, Great Britain, growth consultants, released information showing that, due to demand associated with the accession of eight states from Central and Eastern Europe (CEE-8) to the European Union (EU), new growth opportunities await suppliers of water treatment chemicals.
In the frozen human heart, the silent seeds of confidence are prepared for amazing new growth.
NORDIC BUSINESS REPORT-26 August 2004-Axfood AB sets new growth targets for 2004-2008(C)1994-2004 M2 COMMUNICATIONS LTD http://www.
Apply a high potash liquid feed to dahlias and tie in new growth to stakes.