Definition of Stage IV Breast Cancer

Patients diagnosed with Stage IV or metastatic breast cancers have disease that has spread from the affected breast to one or more distant sites in the body. Historically, metastatic breast cancer has been considered incurable; the goal of treatment has been to provide relief from symptoms and prolong the duration and quality of life. However, there have been some important advances resulting in the addition of many more treatment options for managing this disease. These include the now widespread use of taxane chemotherapy, the development of targeted therapies, and the development of more active hormonal therapy drugs.

By 1997, these patients had been observed over 10 years and the original 14% remain alive without a relapse of their cancer and appear cured of their disease. It is important to understand that because over 50% of patients with stage IV breast cancer relapse, it is not useful to compare the response rate to chemotherapy, the average duration of survival or time to relapse. When evaluating treatment strategies in stage IV breast cancer, patients should compare the percent of patients alive with or without relapse 3-5 years from treatment to determine whether a treatment is truly superior.

In general, women who have advanced breast cancer at the time of diagnosis live approximately 18 months after diagnosis (median survival rate). Those who are still alive five years after their diagnosis of advanced breast cancer can live an additional 3.5 years (median survival rate) according to the American Cancer Society.

Since this is the most deadly category of breast cancer, it is important to work closely with all the health care providers. New treatments are being developed all the time, and second, or even third opinions may give the patient more information about newly discovered successful solutions.

Early detection is clearly the most important factor in breast cancer survival rates. Breast cancer detected at Stage 1 while it is still localized to the breast has a survival rate of 98%-100%, while metastasized breast cancer first detected at Stage 4 drops down to 16%-20%.

Early detection procedures must include monthly self-examinations done at the same time each month. From age 20-40, healthy women should have clinical breast exams performed by their health care providers every three years. After age 40, the breast exams should be annually and should include a mammogram or similar procedure.

North American white women have the highest rates of breast cancer in the world, but the 5-year survival rate for all stages (Stage 1, Stage 2, Stage 3, and Stage 4) combined is 88% for the U.S. A recent study found European countries have lower 5-year breast cancer survival rates, with England at 77.8% and Ireland at 76.2% (Lancet Oncology).

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