Cancer is the catchall term applied to diseases caused by the uncontrolled growth of abnormal cells. Cancer isn't one disease. It is many different diseases, more than 100 and counting.
Each kind of cancer is usually named for the cell type in which it begins — cancer that starts in a lung is called lung cancer; cancer that starts in pigment cells in the skin, which are known as melanocytes, is called melanoma.
When detected and treated early, cancer can often be stopped. That said, cancer is a leading cause of death and disability around the world.
Older women have many options for breast cancer screening and treatment. They should make these decisions based on their health, life expectancy, and personal preferences. They can expect to do as well as younger women with the same type of breast cancer.
Several things can make a prostate biopsy more comfortable for men and reduce risks of complications. These include taking antibiotics before and after, getting proper anesthesia, and temporarily stopping blood thinners if advised. It is also important that the doctor obtains a sufficient number of samples and sorts them for examination according to the region of the prostate they came from, since this can affect decisions about further testing and possible treatment.
The Center for Medicare and Medicaid Services (CMS) covers lung cancer screening for people who meet certain criteria and seek the service at a qualified center. To be covered, a man would need to see his primary care doctor to be counseled on the pros and cons of screening and get referred to a qualified center for the testing. Screening is still available outside of Medicare but may not offer the same quality of follow-up for suspicious findings. Most findings don’t turn out to be cancer, but follow-up testing comes with potential complications, such as infection after needle biopsy of the lung.
Despite evidence that radiation therapy doesn't affect recurrence in women over 70 with early breast cancer, almost two-thirds of women continued to get radiation.
Some types of cancer begin in the bones. These true "bone cancers" include osteosarcoma, chondrosarcoma, Ewing tumor, and others. Most cancers that affect the bones, though, begin in some other organ or tissue and spread (metastasize) to the bones. This is called metastatic bone cancer. After the lungs and liver, the skeleton is the most common destination for cancers that arise in other parts of the body.
The growth of cancer cells in bones can cause pain or broken bones. Pain that occurs without physical activity is especially worrisome.
Basal cell carcinoma, also called epithelioma, is the uncontrolled growth of the skin's basal cells. These are the cells that line the deepest layer of the epidermis, the skin's outermost layer. This type of cancer rarely spreads to other parts of the body.
It is mainly caused by repeated long-term exposure to sunlight. Light-skinned people who spent a lot of time in the sun as children, or who spend time in tanning booths, are especially susceptible. X-ray treatments for acne and exposure to industrial pollutants such as arsenic and hydrocarbons also increase the risk of developing basal cell carcinoma.
Basal cell carcinoma is the most common skin cancer in the United States, with nearly 3 million cases diagnosed each year.
Squamous cell carcinoma is a life-threatening type of skin cancer. Squamous cells are small, flat cells in the outer layer of skin. When these cells become cancerous, they typically develop into rounded skin tumors that can be flat or raised. Sometimes the skin around the tumor gets red and swollen. Squamous cell carcinoma can also occur on the penis or vulva.
Squamous cell carcinoma sometimes develops from a precancerous skin growth called an actinic keratosis. The risk of developing this type of skin cancer is increased among fair-skinned and fair-haired people who have repeatedly been exposed to strong sunlight, individuals who had freckles as a child, and those with blue eyes. Other risk factors include taking immunosuppressants (drugs that weaken the immune system) and being exposed to industrial pollutants such as arsenic, tar, and industrial oils.
Having had genital warts in the past is a major risk factor for genital squamous cell carcinoma.
Melanoma is the deadliest form of skin cancer. It occurs when pigment-making cells in the skin, called melanocytes, begin to reproduce uncontrollably. Melanoma can form from an existing mole or develop on unblemished skin.
The most common type of melanoma spreads on the skin's surface. It is called superficial spreading melanoma. It may stay on the surface or grow down into deeper tissues. Other types of melanoma can start anywhere on or inside the body, including under fingernails or toenails and inside the eye.
Melanoma rarely occurs before age 18. However, the risk of melanoma rises rapidly in young adulthood, making it one of the most common life-threatening forms of cancer in people between the ages of 20 and 50. After age 50, the risk of melanoma rises more slowly with advancing age.
Multiple myeloma is a kind of bone marrow cancer. It is caused by the uncontrolled growth of a type of white blood cell known as plasma cells. Plasma cells make antibodies called immunoglobulins to fight infections.
In multiple myeloma, cancerous plasma cells multiply rapidly in the bone marrow. They eventually invade the outer layers of the bones. This can weaken bones so much that even a small injury can cause a bone to break.
The cancerous plasma cells also make a lot of immunoglobulins. This can cause the blood to become thick and sticky, and lead to the formation of blood clots. At the same time, blood levels of other antibodies drop, leaving the person open to infections.
Kaposi's sarcoma is a type of cancer caused by the human herpes virus 8. It appears as red or purple patches on the skin, mouth, lungs, liver, or digestive system.
Kaposi's sarcoma was a rare and relatively harmless disease until the AIDS epidemic began. An aggressive form of the disease, AIDS-related Kaposi's sarcoma, occurs in people with severely weakened immune systems. It is now the most common type of Kaposi's sarcoma.
There are four main types of Kaposi's sarcoma: