Younger women generally do not consider themselves to be at risk for breast cancer. Only 5 percent of all breast cancer cases occur in women under 40 years old. However, breast cancer can strike at any age, and all women should be aware of their personal risk factors for breast cancer. (A risk factor is a condition or behavior that puts a person at risk for developing a disease.)
There are several factors that put a woman at high risk for developing breast cancer, including:
Risk factors include:
- A personal history of breast cancer or non-cancerous breast disease
- A family history of breast cancer, particularly in a mother, daughter or sister
- History of radiation therapy Evidence of a specific genetic defect (BRCA1/BRCA2 mutation). Women who carry defects on either of these genes are at greater risk for developing breast cancer.
- A Gail Index score of at least 1.7% (The Gail Index uses risk factors such as age, family history of breast cancer, age of first menstrual period and first pregnancy, and number of breast biopsies to calculate a woman's risk of developing breast cancer within the next five years.)
An extended use of oral contraceptives (the Pill) later in life is also sometimes considered a factor for developing breast cancer. However, this is still subject to much debate in the medical community.
What Is Different About Breast Cancer in Younger Women?
Diagnosing breast cancer in younger women (under 40 years old) is more difficult because their breast tissue is generally more dense than the breast tissue in older women. By the time a lump in a younger woman's breast can be felt, the cancer often is advanced.
In addition, breast cancer in younger women may be aggressive and less likely to respond to treatment . Women who are diagnosed with breast cancer at a younger age are more likely to have a mutated (altered) BRCA1 or BRCA2 gene.
Delays in diagnosing breast cancer also are a problem. Many younger women who have breast cancer ignore the warning signs -- such as a breast lump or unusual discharge -- because they believe they are too young to get breast cancer.
Many women assume they are too young to get breast cancer and tend to assume a lump is a harmless cyst or other growth. Some health care providers also dismiss breast lumps in young women as cysts and adopt a "wait and see" approach.
Can Breast Cancer in Younger Women Be Prevented?
Although breast cancer may not be prevented, early detection and prompt treatment can significantly improve a woman's chances of surviving breast cancer. More than 90% of women whose breast cancer is found in an early stage will survive.
When women learn at a young age about the risks and benefits of detecting breast cancer early, they are more likely to following the recommendations regarding clinical exams and mammograms . Young women also need to understand their risk factors and be able to discuss breast health with their health care providers.
Should Women Under Age 40 Get Mammograms?
In general, regular mammograms are not recommended for women under 40 years old, in part, because breast tissue tends to be more dense in young women, making mammograms less effective as a screening tool. In addition, most experts believe the low risk of developing breast cancer at a young age does not justify the radiation exposure or the cost of mammography. However, screening mammograms may be recommended for younger women with a family history of breast cancer and other risk factors.
What's the Best Way for Younger Women to Screen for Breast Cancer?
The American Cancer Society (ACS) recommends that all women 20 years of age or older should perform monthly breast self-examinations . The best time to perform BSE is the day after your monthly period ends. Becoming familiar with the look and feel of their breasts offers the best chance for a young woman to notice and change.
In addition to monthly BSE, annual clinical breast exams performed by your doctor are recommended for all women beginning at age 20. Annual screening mammograms also are recommended at age 40. Women younger than 40 who have a family history or other risk factors for breast cancer should discuss their risk and an appropriate screening schedule with their health care providers.
How Is Breast Cancer Treated in Younger Women?
The course of treatment for breast cancer at any age is based on the extent of the person's disease (whether or not it has spread beyond the breast), as well as the woman's general health and personal circumstances.
Radiation therapy is generally used following a lumpectomy, and chemotherapy and/or hormone therapy often are recommended after surgery to help destroy any remaining cancer cells and prevent recurrence.
Reviewed by the doctors at The Cleveland Clinic Taussig Cancer Center.
Edited by Charlotte E. Grayson, MD, WebMD, February 2004.
Portions of this page © The Cleveland Clinic 2000-2005
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