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Oct 21, 2023 · Cancer is a disease that occurs when cells become abnormal and grow out of control. Normal cells grow—and then die—when they are given signals to do so. Cancer cells ignore these signals and continue to multiply. Cancer cells also may form a tumor at the original site and then spread and form new tumors in other places.
May 16, 2018 · Cancer is a disease in which cells, almost anywhere in the body, begin to divide uncontrollably. Cancerous tumors can invade nearby tissues in the body, and as they grow, some cells may travel to other places in the body to form other, “secondary” tumors, which are also known as metastases.
A tumor (neoplasm) is a solid mass of tissue that forms when abnormal cells group together. They can form most anywhere in your body, including your bones, skin, tissue, organs and glands. Many tumors are benign, which means they’re not cancer. You may or may not need treatment for them. Cancerous, or malignant, tumors require cancer treatment.
Cancer cells are cells that divide continually, forming solid tumors or flooding the blood or lymph with abnormal cells. Cell division is a normal process used by the body for growth and repair. A parent cell divides to form two daughter cells, and these daughter cells are used to build new tissue or to replace cells that have died because of aging or damage.
The abnormal plasma cells, called myeloma cells, build up in the bone marrow and form tumors in bones all through the body. Multiple myeloma is also called plasma cell myeloma and Kahler disease. Our page on multiple myeloma and other plasma cell neoplasms has more information.
Often tumors are not cancerous; usually noncancerous tumors are not serious, even though the cells in them are abnormal. Cells that are abnormal but not cancerous are what doctors called “organized”—when the pathologist evaluates a biopsy of the tissue under a microscope, the cells look normal and are well-arranged.
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Such tissue-typing tests, when done on cancer cells, reveal that the tumor cells of a particular cancer patient are always of the same transplantation type as the cells of normal tissues located elsewhere in the person's body. Tumors, therefore, arise from one's own tissues, not from cells introduced into the body by infection from another person.
