Key Facts

Cancer is a leading cause of death worldwide: it accounted for 7.9 million deaths (around 13% of all deaths) in 2007.
Lung, stomach, liver, colon and breast cancer cause the most cancer deaths each year.
The most frequent types of cancer differ between men and women.
About 30% of cancer deaths can be prevented.
Tobacco use is the single most important risk factor for cancer.
Cancer arises from a change in one single cell. The change may be started by external agents and inherited genetic factors.

Cancer is a generic term for a large group of diseases that can affect any part of the body. Other terms used are malignant tumours and neoplasms. One defining feature of cancer is the rapid creation of abnormal cells that grow beyond their usual boundaries, and which can then invade adjoining parts of the body and spread to other organs. This process is referred to as metastasis. Metastases are the major cause of death from cancer.

Global burden of cancer

Cancer is a leading cause of death worldwide. The disease accounted for 7.9 million deaths (or around 13% of all deaths worldwide) in 2007. The main types of cancer leading to overall cancer mortality each year are:

lung (1.4 million deaths/year);
stomach (866,000 deaths)
liver (653,000 deaths)
colon (677,000 deaths)
breast (548,000 deaths).
About 80% of all cancer deaths in 2007 occurred in low- and middle-income countries. Deaths from cancer worldwide are projected to continue rising, with an estimated 12 million deaths in 2030.

The most frequent types of cancer worldwide (in order of the number of global deaths) are:

Among men - lung, stomach, liver, colorectal, oesophagus and prostate
Among women - breast, lung, stomach, colorectal and cervical.


What causes cancer?

Cancer arises from one single cell. The transformation from a normal cell into a tumour cell is a multistage process, typically a progression from a pre-cancerous lesion to malignant tumours. These changes are the result of the interaction between a person's genetic factors and three categories of external agents, including:

physical carcinogens, such as ultraviolet and ionizing radiation
chemical carcinogens, such as asbestos, components of tobacco smoke, aflatoxin (a food contaminant) and arsenic (a drinking water contaminant)
biological carcinogens, such as infections from certain viruses, bacteria or parasites.
Some examples of infections associated with certain cancers:

Viruses: hepatitis B and liver cancer, Human Papilloma Virus (HPV) and cervical cancer, and human immunodeficiency virus (HIV) and Kaposi sarcoma.
Bacteria: Helicobater pylori and gastric cancer.
Parasites: schistosomiasis and bladder cancer.
Ageing is another fundamental factor for the development of cancer. The incidence of cancer rises dramatically with age, most likely due to a buildup of risks for specific cancers that increase with age. The overall risk accumulation is combined with the tendency for cellular repair mechanisms to be less effective as a person grows older.

Tobacco use, alcohol use, low fruit and vegetable intake, and infections from hepatitis B, hepatitis C and the human papilloma viruses are leading risk factors for cancer in low- and middle-income countries. Cervical cancer, which is caused by HPV, is a leading cause of cancer death among women in low-income countries.

In high-income countries, tobacco use, alcohol use, and being overweight or obese are primary causes of cancer.


How can the burden of cancer be reduced?

Knowledge about the causes of cancer, and interventions to prevent and manage the disease is extensive. Cancer can be reduced and controlled by implementing evidence-based strategies for cancer prevention, early detection of cancer and management of patients with cancer.

About 30% of cancer could be prevented by modifying or avoiding key risk factors, according to a 2005 study by international cancer collaborators.

Risk factors for cancer:

being overweight or obese
low fruit and vegetable intake
physical inactivity
tobacco use
alcohol use
unsafe sex
urban air pollution
indoor smoke from household use of solid fuels
hepatitis B virus- or hepatitis C virus- contaminated injections in health-care settings

Prevention strategies:

increase avoidance of the risk factors listed above
vaccinate against human papilloma virus (HPV) and hepatitis B virus (HBV) infection
control occupational hazards
reduce exposure to sunlight
Early detection:

About one-third of the cancer burden could be decreased if cases were detected and treated early. Early detection of cancer is based on the observation that treatment is more effective when cancer is detected earlier. The aim is to detect the cancer when it is localized (before metastasis). There are two components of early detection efforts:

Education to help people recognize early signs of cancer and seek prompt medical attention for symptoms, which might include: lumps, sores, persistent indigestion, persistent coughing, and bleeding from the body's orifices.
Screening programmes to identify early cancer or pre-cancer before signs are recognizable, including mammography for breast cancer, and cytology (a "pap smear") for cervical cancer.
Treatment and care:

Treatment aims to cure, prolong life and improve quality of life for patients. Some of the most common cancer types, such as breast cancer, cervical cancer and colorectal cancer, have high cure rates when detected early and treated according to best practice. Principal treatment methods are surgery, radiotherapy and chemotherapy. Fundamental for adequate treatment is an accurate diagnosis through imaging technology (ultrasound, endoscopy or radiography) and laboratory (pathology) investigations.
Relief from pain and other problems can be achieved in over 90% of cancer patients through palliative care. Effective ways exist to provide palliative care for patients and their families in low resource settings.