News tagged with cancer cells

Related topics: cancer , breast cancer , cells , tumor cells , protein

New theory turns cancer on its head

A new theory of how cancer works could lead to the next generation of treatments of the disease. The theory suggests that cancer forms when recently evolved genes are damaged, and cells have to revert to ...

Jul 14, 2014
popularity 4.8 / 5 (18) | comments 1

Pepper and halt: Spicy chemical may inhibit gut tumors

Researchers at the University of California, San Diego School of Medicine report that dietary capsaicin – the active ingredient in chili peppers – produces chronic activation of a receptor on cells lining ...

Aug 01, 2014
popularity 4.9 / 5 (17) | comments 1

Longer telomeres linked to risk of brain cancer

New genomic research led by UC San Francisco (UCSF) scientists reveals that two common gene variants that lead to longer telomeres, the caps on chromosome ends thought by many scientists to confer health ...

Jun 08, 2014
popularity 4.1 / 5 (20) | comments 0

New therapy wipes out cervical cancer in two women

Aricca Wallace knew she was nearly out of time. For more than three years, she had suffered cramping and irregular bleeding, which her doctor thought was a side effect of her birth control implant, known ...

Jun 02, 2014
popularity 4.8 / 5 (17) | comments 0

A simpler way to treat cancer

(Medical Xpress)—Sometimes the best solutions are the simplest ones. This is the philosophy that Northeastern professor Vladimir Torchilin and his team took in new research carried out in collaboration ...

Jun 02, 2014
popularity 4.9 / 5 (14) | comments 1

US regulators fast-track novel leukemia therapy

US regulators on Monday put an experimental immunotherapy agent on the fast track to market approval, after 89 percent of leukemia patients in early trials saw their cancers disappear.

Jul 07, 2014
popularity 5 / 5 (9) | comments 1

Cancer

Cancer (medical term: malignant neoplasm) is a class of diseases in which a group of cells display uncontrolled growth (division beyond the normal limits), invasion (intrusion on and destruction of adjacent tissues), and sometimes metastasis (spread to other locations in the body via lymph or blood). These three malignant properties of cancers differentiate them from benign tumors, which are self-limited, and do not invade or metastasize. Most cancers form a tumor but some, like leukemia, do not. The branch of medicine concerned with the study, diagnosis, treatment, and prevention of cancer is oncology.

Cancer may affect people at all ages, even fetuses, but the risk for most varieties increases with age. Cancer causes about 13% of all human deaths. According to the American Cancer Society, 7.6 million people died from cancer in the world during 2007. Cancers can affect all animals.

Nearly all cancers are caused by abnormalities in the genetic material of the transformed cells. These abnormalities may be due to the effects of carcinogens, such as tobacco smoke, radiation, chemicals, or infectious agents. Other cancer-promoting genetic abnormalities may be randomly acquired through errors in DNA replication, or are inherited, and thus present in all cells from birth. The heritability of cancers are usually affected by complex interactions between carcinogens and the host's genome. New aspects of the genetics of cancer pathogenesis, such as DNA methylation, and microRNAs are increasingly recognized as important.

Genetic abnormalities found in cancer typically affect two general classes of genes. Cancer-promoting oncogenes are typically activated in cancer cells, giving those cells new properties, such as hyperactive growth and division, protection against programmed cell death, loss of respect for normal tissue boundaries, and the ability to become established in diverse tissue environments. Tumor suppressor genes are then inactivated in cancer cells, resulting in the loss of normal functions in those cells, such as accurate DNA replication, control over the cell cycle, orientation and adhesion within tissues, and interaction with protective cells of the immune system.

Diagnosis usually requires the histologic examination of a tissue biopsy specimen by a pathologist, although the initial indication of malignancy can be symptoms or radiographic imaging abnormalities. Most cancers can be treated and some cured, depending on the specific type, location, and stage. Once diagnosed, cancer is usually treated with a combination of surgery, chemotherapy and radiotherapy. As research develops, treatments are becoming more specific for different varieties of cancer. There has been significant progress in the development of targeted therapy drugs that act specifically on detectable molecular abnormalities in certain tumors, and which minimize damage to normal cells. The prognosis of cancer patients is most influenced by the type of cancer, as well as the stage, or extent of the disease. In addition, histologic grading and the presence of specific molecular markers can also be useful in establishing prognosis, as well as in determining individual treatments.

This text uses material from Wikipedia licensed under CC BY-SA