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See the article about cancer for the main article about malignant tumors. When normal cells are damaged or old they undergo apoptosis; cancer cells, however, avoid apoptosis. ...
Tumor (American English) or tumour (British English) originally means "swelling", and is sometimes still used with that meaning. Tumor meaning swelling is one of the five classical characteristics of inflammation. However, the term is now primarily used to denote abnormal growth of tissue. This growth can be either malignant or benign. American English or U.S. English is the diverse form of the English language used mostly in the United States of America. ...
Diagram showing the geographical locations of selected languages and dialects of the British Isles. ...
Inflammation is the first response of the immune system to infection or irritation and may be referred to as the innate cascade. ...
Biological tissue is a group of cells that perform a similar function. ...
In medicine, malignant is a clinical term that is used to describe a clinical course that progresses rapidly to death. ...
Benign is any condition which, untreated or with symptomatic therapy, will not become life-threatening. ...
Malignant tumors are called cancer. Cancer has the potential to invade and destroy neighboring tissues and create metastases. Benign tumors do not invade neighboring tissues and do not seed metastases, but may locally grow to great size. They usually do not return after surgical removal. When normal cells are damaged or old they undergo apoptosis; cancer cells, however, avoid apoptosis. ...
Metastasis (Greek: change of the state) is the spread of cancer from its primary site to other places in the body. ...
Depending on tissue of origin, tumors may be:
- Tumors of epithelial origin.
- Tumors of mesenchymal origin:
- connective tissue:
- muscle:
- endothelium:
- Tumors of blood cells:
- Tumors of germ cells:
- Teratoma (mature teratoma, immature teratoma)
An epithelial tumor is considered malignant if it penetrates the basal lamina and is considered benign if it does not. In zootomy, epithelium is a tissue composed of a layer of cells. ...
In medicine, squamous cell carcinoma is a form of carcinoma cancer that occurs in many different organs, including the skin, the esophagus, the lungs, and the cervix. ...
Basal cell carcinoma (BCC) is the most common skin cancer in humans. ...
Adenoma refers to a collection of growths (-oma) of glandular origin. ...
In medicine, carcinoma is any cancer that arises from epithelial cells. ...
Renal cell carcinoma, a form of kidney cancer that involves cancerous changes in the cells of the renal tubule, is the most common type of kidney cancer in adults. ...
Renal cell carcinoma, also known by the eponym Grawitz tumor, is the most common form of kidney cancer arising from the renal tubule. ...
Hepatocellular carcinoma (HCC, also called hepatoma) is a primary malignancy (cancer) of the liver. ...
A mole or melanocytic naevus is a small spot of darkened pigment on the skin, which forms where there is a high concentration of melanin. ...
Skin cancer, close-up of level IV melanoma Melanoma is a malignant tumour of melanocytes . ...
Fibromas are benign non-functioning tumours in the sex cord-stromal tumour group of ovarian neoplasms. ...
Fibrosarcoma - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ...
A myxoma is the most common primary tumor of the heart. ...
Chondroma is a benign cartilaginous tumor, encapsulated, with a lobular growing pattern. ...
A chondrosarcoma is a cancer of the cartilage. ...
Osteosarcoma is the most common primary malignant bone tumour, excluding myeloma and lymphoma. ...
A lipoma is a benign tumor composed of fatty tissue. ...
Liposarcoma is a malignant tumor that arises in fat cells in deep soft tissue, such as that inside the thigh. ...
A leiomyoma (plural is leiomyomata) is a benign smooth muscle neoplasm that is not premalignant. ...
A rhabdomyoma is a benign tumor of muscle. ...
A rhabdmyosarcoma is a form of cancer of the sarcoma subtype that shows differentiation or determination towards resembling skeletal muscle. ...
Hemangioma is a generally benign growth of blood vessels. ...
A glomus tumor is a rare neoplasm usually found in the skin of the extremities. ...
Hemangiosarcoma is a rapidly growing, highly invasive variety of cancer. ...
Leukemia (leukaemia in Commonwealth English) is a group of blood diseases characterized by malignancies (cancer) of the blood-forming tissues. ...
Non-Hodgkins lymphoma is a type of cancer. ...
Hodgkins disease is a type of lymphoma described by Thomas Hodgkin in 1832, and characterized by the presence of Reed-Sternberg cells. ...
A teratoma is a type of tumor that derives from pluripotent germ cells. ...
The basal lamina (previously called basement membrane) is a layer on which epithelium sits. ...
Tumors are caused by mutations in DNA of cells. An accumulation of mutations is needed for a tumor to emerge. Mutations that activate oncogenes or repress tumor supressor genes can eventually lead to tumors. Cells have mechanisms that repair DNA and other mechanisms that cause the cell to destroy itself by committing apoptosis if DNA damage gets too severe. Mutations that repress the genes for these mechanisms can also eventually lead to cancer. A mutation in one oncogen or one tumor repressor gen is usually not enough for a tumor to occur. A combination of a number of mutations is necessary. This article is about mutation in biology, for other meanings see: mutation (disambiguation). ...
Space-filling model of a section of DNA molecule Deoxyribose nucleic acid (DNA) is a nucleic acid that contains the genetic instructions specifying the biological development of all cellular forms of life (and many viruses). ...
Cell biology (also called cellular biology or cytology, from the Greek kytos, container) is an academic discipline which studies cells. ...
An oncogene is a gene that can cause a cell to develop into a tumor cell, possibly resulting in cancer. ...
A tumor suppressor gene is a gene that reduces the probability that a cell in a multicellular organism will turn into a tumor cell. ...
In biology, apoptosis (from the Greek words apo = from and ptosis = falling, pronounced ap-a-tow-sis[1]) is one of the main types of programmed cell death (PCD). ...
DNA microarrays can be used to determine if oncogens or tumor repressor gens have been mutated. Possibly in the future tumors can be treated better by using DNA microarrays to determine the exact characteristics of the tumor. Missing image A DNA microarray, the different colours indicate relative expression of different genes. ...
As people get older, they accumulate more mutations in their DNA. This means that the prevalence of tumors increases strongly with increasing age. It is also the case that the older a person with a tumor is, the higher the chances are that the tumor is malignant. For example, if a woman of 20 years old has a tumor in her breast it is very likely that the tumor is benign. However, if a woman of 70 has a tumor in her breast it is almost certain that it is malignant. The prevalence of a disease in a statistical population is defined as follows: Prevalence is useful because it is a measure of the commonality of disease. ...
See also
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