Ovarian cancer symptoms
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A cell that degenerates into a tumor cell does usually not acquire all these properties at once, but its daughter cells are selected to build them. This process is called cellular evolution. A first step in the development of a tumor cell is usually a small change in the DNA, often a point mutation, which leads, among other things, to a genetic instability of the cell. The instability increases to a point where the cell loses whole chromosomes, or has double ones. Also, the DNA methylation pattern of the cell changes, activating and deactivating genes more or less at random. Cells that divide at a high rate, such as stem cells, show a higher risk of becoming tumor cells than those which divide less or not at all, for example neurons. If the initial tumor cell (or group of tumor cells) is not removed by the immune system, it will develop into cancer.
In medicine, cancer is a general term for any of a number of different diseases where some of the body's own cells divide in an uncontrolled manner. The resulting new cells can form a malignant tumor (a neoplasm) or propagate throughout the body.
The term cancer is very broad and covers many different illnesses including:
- Carcinoma (arising from epithelial cells)
- Bladder carcinoma
- Breast cancer
- Cervical cancer
- Colorectal cancer (includes colon, rectum, anus, and appendix)
- Esophageal cancer
- Endometrial cancer (uterus)
- Hepatocellular carcinoma (liver)
- Laryngeal cancer
- Lung cancer
- Oral cancer
- Ovarian cancer
- Pancreatic cancer
- Prostate cancer
- Renal cell carcinoma (kidney)
- Skin cancer
- Stomach cancer
- Testicular cancer
- Thyroid cancer
- Sarcoma (arising from connective tissue and related)
- Gastrointestinal stromal cell tumor (GIST)
- Rhabdomyosarcoma (muscle)
- Osteosarcoma (bone)
- Hematological malignancies (blood and bone marrow)
- Leukemia
- Lymphomas
- Hodgkin's disease
- Non-Hodgkin's lymphoma
- Multiple myeloma
- Miscellaneous
- Brain tumor
- Melanoma, Moles and dysplastic nevi
- Teratoma
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Articles and links about cancer treatments. - Ladies Home Journal: Cancer
Links to articles about skin and breast tumors. - Untangling The Web
Provides access to disability resources including those needed for cancer care support. - Don't Say That Word
Provides an online forum on cancer, information, personal stories, poetry and remembrance pages. Graphics-intensive. - Hematology Oncology News & Issues
Headline news and articles for cancer professionals and patients.