Malignant Melanoma Stage IV
Stage IV melanoma is the most advanced form of this skin cancer, where the disease has spread beyond its original location to distant parts of the body such as the lungs, liver, brain, or other organs. While this diagnosis is serious, major advances in treatment over the past decade have dramatically improved outcomes for many patients.
Table of contents
- What is Stage IV Melanoma?
- Understanding the Staging System
- Survival Rates and Outlook
- Treatment Options
- Clinical Trials
What is Stage IV Melanoma?
Stage IV melanoma, also called metastatic melanoma or advanced melanoma, occurs when the cancer has traveled beyond the original tumor site and beyond nearby lymph nodes (small organs that are part of the body’s defense system) to more distant areas of the body[1][2]. This means cancer cells have spread through the blood or the lymphatic system to reach other organs.
The most common places where stage IV melanoma spreads include the lungs, liver, brain, bones, and the gastrointestinal tract (the digestive system from the stomach to the intestines)[1][2]. The cancer may also spread to distant points in the skin, soft tissue (including muscles, nerves, fat, and blood vessels), or to lymph nodes far away from where the melanoma first started[2][3].
When melanoma spreads to other parts of the body, these new locations are called secondary cancers or metastases[2]. Stage IV melanoma is considered an advanced disease that requires comprehensive treatment.
Understanding the Staging System
Melanoma staging is based on the American Joint Committee on Cancer staging system. This system uses a method called TNM staging, which stands for Tumor, Node, and Metastasis[1][2]. The T describes the size and characteristics of the original tumor, the N describes whether cancer has spread to nearby lymph nodes, and the M describes whether the cancer has spread to distant parts of the body.
In the TNM system, stage IV melanoma is defined as any T (any tumor), any N (any lymph node involvement), and M1 (presence of distant spread)[2]. This means that regardless of the size of the original tumor or whether nearby lymph nodes are involved, the presence of distant spread automatically classifies the melanoma as stage IV.
The staging system helps doctors understand the extent of the disease and predict how melanomas of the same stage might behave. This information is crucial for determining the best treatment approach for each patient[1].
Survival Rates and Outlook
According to the American Cancer Society, the 5-year survival rate for stage IV melanoma is 35 percent. This means that an estimated 35 out of 100 people with stage IV melanoma will be alive 5 years after diagnosis[6]. However, newer treatment options have improved these numbers significantly.
The Memorial Sloan Kettering Cancer Center suggests that the survival rate has increased to 50 percent due to newer treatment options that have become available in recent years[6]. These newer treatments can control advanced melanoma for years and, in some cases, even cure it[6].
It is important to understand that survival rates are estimates based on data from large groups of people. Many individual factors influence a person’s chance of survival, including their age, overall health, how well they respond to treatment, and the availability of new treatment options[6]. The place in the body where the melanoma has spread also affects survival. People with melanoma that has spread to the skin, lymph nodes, or digestive tract tend to have better outcomes than those with cancer in the liver, brain, or bones[10].
Treatment for stage IV melanoma aims to control the cancer and help relieve symptoms[2]. While the diagnosis is serious, advances in immunotherapy and targeted therapy have dramatically changed the outlook for patients with advanced melanoma.
Treatment Options
Treatment options for stage IV melanoma have expanded greatly over the past 10 years[1][7]. The choice of treatment depends on several factors, including where the melanoma has spread, your general health and fitness level, and specific characteristics of the cancer cells.
Immunotherapy
Immunotherapy helps strengthen or restore the immune system’s ability to fight cancer[13]. This type of treatment is now commonly used for stage IV melanoma to help shrink and control the growth of the cancer. Several immunotherapy drugs are available, including nivolumab, pembrolizumab, and ipilimumab[13]. These drugs are given through a needle into a vein.
Checkpoint inhibitors, a type of immunotherapy, offer the best chances of curing advanced melanoma according to recent research[6]. These medications work by helping the immune system recognize and attack cancer cells more effectively.
Targeted Therapy
Targeted therapy uses drugs to target specific molecules on or inside cancer cells to stop their growth and spread[13]. This treatment is usually offered for melanoma with certain gene changes, including mutations in the BRAF gene. Common targeted therapy drugs include dabrafenib combined with trametinib, and vemurafenib combined with cobimetinib[13]. These drugs are taken as pills by mouth daily.
Surgery
Surgery is rarely used as the main treatment for metastatic melanoma but may be considered if the cancer is found in only one or a few small areas[13]. Treatment for stage IV melanoma frequently combines surgery with immunotherapy or targeted therapy[1][7].
Radiation Therapy
Radiation therapy uses high-energy rays to destroy cancer cells. It may be used to treat melanoma that has spread to specific areas such as the bone or brain, and can help relieve symptoms[2][13].
Other Treatment Approaches
Additional treatment options may include injecting drugs directly into the melanoma (called intralesional therapy), specialized chemotherapy delivered to a specific limb, or chemotherapy combined with an electric current[2]. Traditional chemotherapy into the bloodstream is usually only considered if targeted cancer drugs or immunotherapy are not suitable options[2].
Clinical Trials
Clinical trials offer patients access to treatment approaches that may prove more beneficial than those currently approved[1][7]. These research studies also drive our understanding of melanoma forward, improving future treatment options for all patients.
Given the very rapid development of new agents and combinations, patients and their physicians are encouraged highly to consider treatment in a clinical trial for initial treatment and at the time of disease progression[1][7]. Your doctor can help you understand if a clinical trial might be a good option for your specific situation[2].
Clinical trials not only provide access to cutting-edge treatments but also contribute to the advancement of medical knowledge that benefits future patients with melanoma.
