Topics covered in this post
What breast cancer is
Most common types of the disease
Symptoms and warning signs
Known risk factors
Diagnosis and tests used
Staging: what cancer stages mean
Treatment: main therapeutic approaches
Prognosis and the importance of early detection
Prevention and screening
Myths and facts
Quick FAQ
Important notice (health disclaimer)
References and recommended reading
What is breast cancer
Breast cancer occurs when cells in breast tissue undergo genetic changes that cause them to multiply uncontrollably. Over time, these cells can form a tumor that may invade nearby tissues and, in some cases, spread to other parts of the body.
It is one of the most common cancers worldwide and also one of the most extensively studied. When diagnosed early, treatment success rates are significantly higher.
Although it is far more common in women, men can also develop breast cancer, though this represents a small percentage of cases.
Most common types of the disease
There are several types of breast cancer, classified according to where the tumor originates.
The most common include:
Invasive ductal carcinoma
The most frequent type. It begins in the milk ducts and invades surrounding tissues.
Invasive lobular carcinoma
Originates in the lobules responsible for milk production.
Ductal carcinoma in situ (DCIS)
An early form in which abnormal cells remain confined to the ducts without invading nearby tissue.
Triple-negative breast cancer
A more aggressive subtype that lacks hormone receptors and HER2 expression.
HER2-positive breast cancer
Characterized by increased expression of the HER2 protein, which stimulates tumor growth.
Each subtype has distinct characteristics and may require different treatment strategies.
Symptoms and warning signs
Breast cancer does not always cause symptoms in early stages, which makes screening essential.
Common signs include:
A lump or mass in the breast or armpit
Changes in breast size or shape
Skin dimpling or nipple retraction
Redness or thickening of the skin
Abnormal nipple discharge
Persistent pain in a specific area of the breast
Not every breast lump is cancer, but any persistent change should be evaluated by a healthcare professional.
Known risk factors
Some factors increase the likelihood of developing the disease:
Age over 50
Family history of breast or ovarian cancer
Genetic mutations (BRCA1 or BRCA2)
Early menarche or late menopause
Obesity and sedentary lifestyle
Frequent alcohol consumption
Long-term hormone therapy
Having risk factors does not mean a person will develop cancer, but it may justify closer monitoring.
Diagnosis and tests used
Diagnosis usually involves several steps.
Mammography
The main screening test and capable of detecting tumors before symptoms appear.
Breast ultrasound
Helps differentiate solid masses from cysts and complements mammography.
Breast MRI
Used in specific situations, such as patients at high risk.
Biopsy
Confirms the diagnosis by analyzing cells from suspicious tissue.
Staging: what cancer stages mean
After diagnosis, breast cancer is classified into stages that indicate how far the disease has progressed.
Stage 0
Localized tumor without invasion.
Stages I and II
Small to moderate tumors, often with a good chance of cure.
Stage III
Locally advanced disease.
Stage IV
When metastasis is present, meaning the cancer has spread to other organs.
Staging helps guide the most appropriate treatment strategy.
Treatment: main therapeutic approaches
Treatment depends on tumor type, stage of disease, and patient characteristics.
Common approaches include:
Surgery
May involve removing the tumor (lumpectomy) or the entire breast (mastectomy).
Radiotherapy
Used to destroy remaining cancer cells after surgery.
Chemotherapy
Medications that act against cancer cells throughout the body.
Hormone therapy
Used for tumors that are hormone-receptor positive.
Targeted therapies
Specific treatments for tumors with particular molecular characteristics, such as HER2-positive cancers.
Prognosis and the importance of early detection
When detected early, breast cancer has high survival rates.
Early diagnosis allows for less aggressive treatments and significantly increases the chances of cure.
For this reason, screening programs using periodic mammography are widely recommended in many countries.
Prevention and screening
Some measures can help reduce risk or facilitate early detection:
Maintaining a healthy weight
Exercising regularly
Limiting alcohol consumption
Avoiding smoking
Having mammograms according to medical recommendations
Breast self-examination can help individuals become familiar with their bodies, but it does not replace screening tests.
Myths and facts
“Only women with a family history develop breast cancer.”
Myth. Most cases occur in people without a family history.
“Every breast lump is cancer.”
Myth. Many lumps are benign, such as cysts or fibroadenomas.
“Mammography can cause cancer.”
Myth. The radiation dose is very low, and the benefits far outweigh the risks.
Quick FAQ
Can men get breast cancer?
Yes, although it is rare.
Does breast cancer always form a lump?
No. Some tumors are detected only through imaging tests.
At what age should mammography begin?
Recommendations vary, but screening often starts between ages 40 and 50 depending on guidelines and individual risk.
Important notice (health disclaimer)
This content is educational and does not replace medical evaluation. Breast changes, persistent lumps, or nipple discharge should be assessed by a healthcare professional.
References and recommended reading
National Cancer Institute (INCA). Breast cancer: early detection and treatment.
World Health Organization (WHO). Breast cancer global statistics and prevention strategies.
American Cancer Society. Breast Cancer Facts & Figures.
National Comprehensive Cancer Network (NCCN). Breast Cancer Clinical Practice Guidelines.
