The main reason that cancer is so serious is its ability to spread in the body. Cancer cells can spread locally by moving into nearby normal tissue. Cancer can also spread regionally, to nearby lymph nodes, tissues, or organs. And it can spread to distant parts of the body. When this happens, it is called metastatic cancer1. For many types of cancer, it is also called stage IV (four) cancer. The process by which cancer cells spread to other parts of the body is called metastasis. Jay Harold wrote this post, “9 Cancer Stats to Know & What Is Metastatic Cancer?” to provide very important information to deal with an often misunderstood Cancer term.
When observed under a microscope and tested in other ways, metastatic cancer cells have features like that of the primary cancer and not like the cells in the place where the cancer is found. This is how doctors can tell that it is cancer that has spread from another part of the body.
Metastatic cancer has the same name as the primary cancer. For example, breast cancer that spreads to the lung is called metastatic breast cancer, not lung cancer. It is treated as stage IV breast cancer, not as lung cancer.
Sometimes when people are diagnosed with metastatic cancer, doctors cannot tell where it started. This type of cancer is called cancer of unknown primary origin, or CUP. See the Carcinoma of Unknown Primary page for more information.
When a new primary cancer occurs in a person with a history of cancer, it is known as a second primary cancer. Second primary cancers are rare. Most of the time, when someone who has had cancer has cancer again, it means the first primary cancer has returned.
Statistics at a Glance: The Burden of Cancer in the United States2
- In 2018, an estimated 1,735,350 new cases of cancer will be diagnosed in the United States and 609,640 people will die from the disease.
- The most common cancers (listed in descending order according to estimated new cases in 2018) are breast cancer, lung and bronchus cancer, prostate cancer, colon and rectum cancer, melanoma of the skin, bladder cancer, non-Hodgkin lymphoma, kidney and renal pelvis cancer, endometrial cancer, leukemia, pancreatic cancer, thyroid cancer, and liver cancer.
- The number of new cases of cancer (cancer incidence) is 439.2 per 100,000 men and women per year (based on 2011–2015 cases).
- The number of cancer deaths (cancer mortality) is 163.5 per 100,000 men and women per year (based on 2011–2015 deaths).
- Cancer mortality is higher among men than women (196.8 per 100,000 men and 139.6 per 100,000 women). When comparing groups based on race/ethnicity and sex, cancer mortality is highest in African American men (239.9 per 100,000) and lowest in Asian/Pacific Islander women (88.3 per 100,000).
- In 2016, there were an estimated 15.5 million cancer survivors in the United States. The number of cancer survivors is expected to increase to 20.3 million by 2026.
- Approximately 38.4% of men and women will be diagnosed with cancer at some point during their lifetimes (based on 2013–2015 data).
- In 2017, an estimated 15,270 children and adolescents ages 0 to 19 were diagnosed with cancer, and 1,790 died of the disease.
- Estimated national expenditures for cancer care in the United States in 2017 were $147.3 billion. In future years, costs are likely to increase as the population ages and cancer prevalence increases. Costs are also likely to increase as new, and often more expensive, treatments are adopted as standards of care.
How Cancer Spreads
Cancer cells spread through the body in a series of steps. These steps include:
- Growing into, or invading, nearby normal tissue
- Moving through the walls of nearby lymph nodes or blood vessels
- Traveling through the lymphatic system and bloodstream to other parts of the body
- Stopping in small blood vessels at a distant location, invading the blood vessel walls, and moving into the surrounding tissue
- Growing in this tissue until a tiny tumor forms
- Causing new blood vessels to grow, which creates a blood supply that allows the tumor to continue growing
Most of the time, spreading cancer cells die at some point in this process. But, as long as conditions are favorable for the cancer cells at every step, some of them are able to form new tumors in other parts of the body. Metastatic cancer cells can also remain inactive at a distant site for many years before they begin to grow again, if at all.
Where Cancer Spreads
Cancer can spread to most any part of the body, although different types of cancer are more likely to spread to certain areas than others. The most common sites where cancer spreads are the bone, liver, and lung. The following list shows the most common sites of metastasis, not including the lymph nodes, for some common cancers:
| Cancer Type | Main Sites of Metastasis |
|---|---|
| Bladder | Bone, liver, lung |
| Breast | Bone, brain, liver, lung |
| Colon | Liver, lung, peritoneum |
| Kidney | Adrenal gland, bone, brain, liver, lung |
| Lung | Adrenal gland, bone, brain, liver, other lung |
| Melanoma | Bone, brain, liver, lung, skin, muscle |
| Ovary | Liver, lung, peritoneum |
| Pancreas | Liver, lung, peritoneum |
| Prostate | Adrenal gland, bone, liver, lung |
| Rectal | Liver, lung, peritoneum |
| Stomach | Liver, lung, peritoneum |
| Thyroid | Bone, liver, lung |
| Uterus | Bone, liver, lung, peritoneum, vagina |
Symptoms of Metastatic Cancer
Metastatic cancer does not always cause symptoms. When symptoms do occur, their nature and frequency will depend on the size and location of the metastatic tumors. Some common signs of metastatic cancer include:
- Pain and fractures, when cancer has spread to the bone
- A headache, seizures, or dizziness, when cancer has spread to the brain
- Shortness of breath, when cancer has spread to the lung
- Jaundice or swelling in the belly, when cancer has spread to the liver.
Treatment for Metastatic Cancer
Once cancer spreads, it can be hard to control. Although some types of metastatic cancer can be cured with current treatments, most cannot. Even so, there are treatments for all patients with metastatic cancer. The goal of these treatments is to stop or slow the growth of the cancer or to relieve symptoms caused by it. In some cases, treatments for metastatic cancer may help prolong life.
The treatment that you may have depends on your type of primary cancer, where it has spread, treatments you’ve had in the past, and your general health. To learn about treatment options, including clinical trials, find your type of cancer among the PDQ® Cancer Information Summaries for Adult Treatment and Pediatric Treatment.
When Metastatic Cancer Can No Longer Be Controlled
If you have been told you have metastatic cancer that can no longer be controlled, you and your loved ones may want to discuss end-of-life care. Even if you choose to continue receiving treatment to try to shrink the cancer or control its growth, you can always receive palliative care to control the symptoms of cancer and the side effects of treatment. Information on coping with and planning for end-of-life care is available in the Advanced Cancer section.
Ongoing Research
Researchers are studying new ways to kill or stop the growth of primary and metastatic cancer cells. This research includes finding ways to help your immune system fight cancer.
