National cancer coalition

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Malignant tumors such as carcinoma or sarcoma, lymphoma or leukemia originate from a cell or a group of cells in a multicellular organism that has several distinct properties:

evading apoptosis
Unlimited Growth Potential
self-sufficiency of growth factors
insensitivity to anti-growth factors
increased cell division rate
altered differentiation (specialization) ability
no ability for contact inhibition
ability to invade neighbouring tissue
ability to build metastases
ability to promote blood vessel growth (angiogenesis)

In cellular model systems, cells are exposed to carcinogenic influences (chemicals, radiation). In these systems, the first signs of a cell developing into a tumor cell are:

Immortality. The usual number of cell divisions for a mammalian cell is 50-60 (cell senescence), then it ceases to divide. Tumor cells keep dividing forever.
Altered morphology.
Building of cellular clusters (Foci).
Loss of contact inhibition.
Low or no need for growth factors.

Items 2-4 (above) can sometimes be traced to mutations in genes that result in a disruption of cell adhesion. Some cell adhesion proteins are oncogenes.

Treatment of cancer typically involves surgery to remove tumors and nearby lymph nodes to which the cancer may have spread, combined with radiation therapy and/or chemotherapy. The latter two target cells in the body that are rapidly dividing. This includes the cancer cells but also certain healthy ones, which is the reason for the severe side effects of these treatments.

USnews.com: Best Cancer Hospitals
Ranking by the magazine of the fifty top cancer hospitals in the United States.
Conversations In Care
Explores the challenges surrounding physician and patient communications in cancer.
Cancer Leadership Council
A patient-centered forum of national advocacy organizations addressing public policy issues.
Cancer Options UK
Designed to help patients and families find appropriate treatment options and services. Provides access to a nurse specialist.
Cancer Matters
Contains information, treatment options, and resources on a range of cancers. Also includes links to general resources, and a directory of services and resources located in a number of US cities.

National cancer coalition