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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.

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An aberrant new growth of abnormal cells or tissues; a tumor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
If the new growth at the tips of your pine's branches has turned brown, a disease called Diplodia tip blight may be the problem.
The post KSA's Raza launches operations in Kingdom in line with new growth strategy appeared first on Middle East Construction News .
Remove dead, diseased or spindly growth in late winter/ early spring before new growth has started.
You'll need to remove any dead, diseased or spindly growth in late winter or early spring to produce a well-spaced framework, before new growth has started.
A committee will be created and tasked with establishing guidelines for determining which industries will be designated as new growth engines and which companies will be eligible for financial support, while financial regulators will monitor the implementation of support programs and assess the performance of the companies that receive support.
Before new growth begins, the dead matter needs to be trimmed.
This new growth model would help the CEE countries distance themselves from a growth strategy highly dependent on consumption and foreign investment, and move toward a model based on investment, productivity and trade.
As follows from the chart above, the index is presently developing wave 3* of the new growth impulse.
dollars) by 2020 into 5 new growth businesses, including medical equipment, biomedicine, solar cell, vehicle battery and light-emitting diode (LED).
A trial to determine the quality of tea harvested at various phenological stages (namely new growth, older growth and whole plants) from wild and cultivated bush tea was conducted.
The manager said the town anticipates using the full fiscal 2012 excess levy capacity and Proposition 2-1/2, and contemplates $200,000 in new growth in the revaluation year, an increase of $100,000 from typical projections of new growth, which moderates the tax increase.