Breast Cancer Screening

A Simple Guide Every Woman Should Know

Key Statistics

Breast cancer is the most common cancer among women worldwide.

In 2022, approximately 2.3 million women were diagnosed, and about 670,000 deaths were reported globally.

Although it primarily affects women, breast cancer can also occur in men, accounting for approximately 0.5–1% of cases.

Importantly, around 80% of breast cancer cases occur in women without clear risk factors, other than age and gender.

🔹 Introduction to Breast Cancer Screening

Breast cancer is a common but highly treatable disease when detected early. Understanding the basics—symptoms, risk factors, screening, and treatment—can help you make informed and confident decisions.

🔹 What is Breast Cancer?

Breast cancer occurs when abnormal cells in the breast grow uncontrollably and form a tumor.

These cells often begin in the milk ducts or lobules. Early-stage disease may remain confined to the breast, but over time it can spread to nearby lymph nodes or distant organs such as the lungs, liver, bones, or brain.

🔹 Who is at Risk?

Being female is the strongest risk factor. Other factors include:

• Increasing age

• Obesity

• Alcohol use

• Family history

• Hormonal and reproductive factors

• 
  

However, many women diagnosed with breast cancer have no known family history.

🔹 Symptoms to Watch For

Breast cancer may not cause symptoms early on. When symptoms occur, they may include:

• A lump in the breast or underarm

• Changes in breast size or shape

• Skin dimpling or redness

• Nipple changes or discharge

• Persistent breast discomfort

• 
  

Any new breast change should be evaluated by a doctor.

🔹 Types of Breast Cancer

Breast cancer includes several subtypes:

• Hormone receptor–positive

• HER2-positive

• Triple-negative

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Each behaves differently and requires a specific treatment strategy.

🔹 Stages of Breast Cancer

• Stage 0–I: Early-stage

• Stage II–III: Locally advanced

• Stage IV: Metastatic

Stage strongly influences treatment and prognosis.

🟣 🔹 Breast Cancer Screening

Breast cancer screening means checking the breasts for cancer before symptoms appear.

Screening does not prevent cancer, but it helps detect it early—when treatment is more effective and less aggressive.

🔸 What is screening decision-making?

Choosing when and how to be screened should be based on an informed discussion between you and your doctor.

This is called informed and shared decision-making—understanding benefits and risks, and deciding what is right for you.

🔸 Screening Recommendations

For women at average risk:

• Age 40–74 years → mammography every 2 years

Women should discuss:

• Benefits of early detection

• Possible risks of screening

• Personal risk factors

• 
  

Women at higher risk may need earlier or more frequent screening.

🔸 Types of Screening Tests

1. Mammography (Main test)

A mammogram is an X-ray of the breast and is the most effective screening tool.

• Detects cancer before symptoms

• Improves survival

• Reduces mortality

2. Breast MRI

• Used for high-risk women

• Usually combined with mammography

• Not recommended for average-risk women due to false positives

3. Clinical Breast Exam

• Performed by a healthcare professional

• Can detect lumps or changes

4. Breast Self-Awareness

• Knowing how your breasts normally look and feel

• Helps detect early changes

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However, self-exams alone have not been shown to reduce mortality.

🔸 Benefits of Screening

• Detects cancer early

• Improves treatment success

• Reduces risk of death

🔸 Risks of Screening

Screening also has potential downsides:

• False positives → unnecessary tests and anxiety

• Overdiagnosis → detecting cancers that may never cause harm

• Overtreatment → unnecessary treatments

• Radiation exposure (low but cumulative)

• False negatives → missed cancers

  
  

🔸 Key Takeaways

• Breast cancer screening should start at age 40 for most women  

• Early detection significantly improves treatment outcomes

• High-risk individuals may require earlier and more intensive screening

• Mammography remains the primary screening tool

🔸 Key Message

Screening is important—but it is not one-size-fits-all. Decisions should be individualized based on risk and patient preferences.

📚 References

1. World Health Organization. Breast Cancer Fact Sheet.

2. International Agency for Research on Cancer (GLOBOCAN 2022).

3. National Cancer Institute. Breast Cancer Screening & Treatment.

4. Centers for Disease Control and Prevention. Breast Cancer Screening Guidelines.

5. US Preventive Services Task Force. Breast Cancer Screening Recommendations.

6. American Cancer Society. Breast Cancer Facts & Figures.

Reviewed by: Dr. Omid Modiramani, MD  

Medical Oncologist & Hematologist  

Founder, ICON – International Cancer Opinion Network  

If you or a loved one has been diagnosed with cancer and would like a professional, independent review: Directly talk with Medical oncologist via whatsApp

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