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Finding breast cancer early and getting state-of-the-art cancer treatment are two of the most important ways to prevent deaths from breast cancer.

If breast cancer is found early, when it’s small and has not spread, it is easier to treat successfully. Getting regular screening tests is the most reliable way to find breast cancer early.

The American Cancer Society has screening guidelines for women at average risk for breast cancer and for those at high risk for breast cancer.

What are screening tests?

S?creening refers to tests and exams used to find a disease in people who don’t have any symptoms. The goal of screening tests for breast cancer is to find it early, before it causes symptoms (like a lump in the breast that can be felt). Early detection means finding and diagnosing a disease earlier than if you’d waited for symptoms to start.

Breast cancers found during screening exams are more likely to be smaller and less likely to have spread outside the breast. The size of a breast cancer and how far it has spread are some of the most important factors in predicting the prognosis (outlook) of a woman with this disease.

American Cancer Society screening recommendations for women at average breast cancer risk

These guidelines are for women at average risk for breast cancer. For screening purposes, a woman is considered to be at average risk if she doesn’t have a personal history of breast cancer, a strong family history of breast cancer, or a genetic mutation known to increase risk of breast cancer (such as in a BRCA gene), and has not had chest radiation therapy before the age of 30. (See below for guidelines for women at high risk.)

• Women between 40 and 44 have the option to start screening with a mammogram every year.
• Women 45 to 54 should get mammograms every year.
• Women 55 and older can switch to a mammogram every other year, or they can choose to continue yearly mammograms. Screening should continue as long as a woman is in good health and is expected to live at least 10 more years.
• All women should understand what to expect when getting a mammogram for breast cancer screening – what the test can and cannot do.

Clinical breast exams are not recommended for breast cancer screening among average-risk women at any age.

Mammograms

Mammograms are low-dose x-rays of the breast. Regular mammograms can help find breast cancer at an early stage, when treatment is most likely to be successful. A mammogram can often find breast changes that could be cancer years before physical symptoms develop. Results from many decades of research clearly show that women who have regular mammograms are more likely to have breast cancer found earlier, are less likely to need aggressive treatments like surgery to remove the entire breast (mastectomy) and chemotherapy, and are more likely to be cured.

Mammograms are not perfect. They miss some breast cancers. And if something is found on a screening mammogram, a woman will likely need other tests (such as more mammograms or a breast ultrasound) to find out if it is cancer. There’s also a small chance of being diagnosed with a cancer that never would have caused any problems had it not been found during screening. (This is called overdiagnosis.) It's important that women getting mammograms know what to expect and understand the benefits and limitations of screening.

2D vs. 3D mammograms

In recent years, a newer type of mammogram called digital breast tomosynthesis (commonly known as three-dimensional [3D] mammography) has become much more common, although it’s not available in all breast imaging centers.

Many studies have found that 3D mammography appears to lower the chance of being called back after screening for follow-up testing. It also appears to find more breast cancers, and several studies have shown it can be helpful in women with more dense breasts. A large study is now in progress to better compare outcomes between 3D mammograms and standard (2D) mammograms.

It should be noted that 3D mammograms often cost more than 2D mammograms, and this added cost may not be covered by insurance.

The American Cancer Society (快猫短视频) breast cancer screening guidelines consider having had either a 2D or 3D mammogram as being in line with current screening recommendations. The 快猫短视频 also believes that women should be able to choose between 2D and 3D mammography if they or their doctor believes one would be more appropriate, and that out-of-pocket costs should not be a barrier to having either one.

Clinical breast exam (CBE) and breast self-exam (BSE)

Research has not shown a clear benefit of regular physical breast exams done by either a health professional (clinical breast exams) or by women themselves (breast self-exams). There is very little evidence that these tests help find breast cancer early when women also get screening mammograms. Most often when breast cancer is detected because of symptoms (such as a lump in the breast), a woman discovers the symptom during usual activities such as bathing or dressing. Women should be familiar with how their breasts normally look and feel and should report any changes to a health care provider right away.

While the American Cancer Society does not recommend regular clinical breast exams or breast self-exams as part of a routine breast cancer screening schedule, this does not mean that these exams should never be done. In some situations, particularly for women at higher-than-average risk, for example, health care providers may still offer clinical breast exams, along with providing counseling about risk and early detection. And some women might still be more comfortable doing regular self-exams as a way to keep track of how their breasts look and feel. But it’s important to understand that there is very little evidence that doing these exams routinely is helpful for women at average risk of breast cancer.

American Cancer Society screening recommendations for women at high risk

Women who are at high risk for breast cancer based on certain factors should get a breast MRI and a mammogram every year, typically starting at age 30. This includes women who:

• Have a lifetime risk of breast cancer of about 20% to 25% or greater, according to risk assessment tools that are based mainly on family history (see below)
• Have a known BRCA1 or BRCA2 gene mutation (based on having had genetic testing)
• Have a first-degree relative (parent, brother, sister, or child) with a BRCA1 or BRCA2 gene mutation, and have not had genetic testing themselves
• Had radiation therapy to the chest before they were 30 years old
• Have Li-Fraumeni syndrome, Cowden syndrome, or Bannayan-Riley-Ruvalcaba syndrome, or have first-degree relatives with one of these syndromes

The American Cancer Society recommends against MRI screening for women whose lifetime risk of breast cancer is less than 15%.

There’s not enough evidence to make a recommendation for or against yearly MRI screening for women who have a higher lifetime risk based on certain factors, such as:

• Having a personal history of breast cancer, ductal carcinoma in situ (DCIS), lobular carcinoma in situ (LCIS), atypical ductal hyperplasia (ADH), or atypical lobular hyperplasia (ALH)
• Having “extremely” or “heterogeneously” dense breasts as seen on a mammogram

If MRI is used, it should be in addition to, not instead of, a screening mammogram. This is because although an MRI is more likely to find cancer than a mammogram, it may still miss some cancers that a mammogram would find.

Most women at high risk should begin screening with MRI and mammograms when they are 30 and continue for as long as they are in good health. But this is a decision that should be made with a woman's health care providers, taking into account her personal circumstances and preferences.

Tools used to assess breast cancer risk

Several risk assessment tools can help health professionals estimate a woman’s breast cancer risk. These tools give rough estimates of breast cancer risk, based on different combinations of risk factors and different data sets.

Because each of these tools uses different factors to estimate risk, they might give different risk estimates for the same woman. A woman's risk estimates can also change over time.

Risk assessment tools that include family history in first-degree relatives (parents, siblings, and children) and second-degree relatives (such as aunts and grandparents) on both sides of the family should be used with the 快猫短视频 guidelines to decide if a woman should have MRI screening. The use of any of the risk assessment tools and its results should be discussed by a woman with her health care provider.