HER2-positive breast cancers occur because of a protein that promotes the overgrowth of cancer cells and the formation of abnormal tumours. Symptoms can include a lump in the breast, changes in breast shape or size, skin dimpling, nipple discharge, and swollen lymph nodes. Treatment options have advanced, with targeted therapies like trastuzumab (Herceptin) effectively attacking HER2-positive cells, often combined with chemotherapy, radiation, surgery, and hormone therapy based on the cancer's stage.

If left untreated, HER2-positive breast cancer can rapidly progress, causing severe health issues. Cancer can metastasize to other body parts, including bones, liver, brain, and lungs, leading to life-threatening complications and significantly reduced survival rates. Early detection with appropriate treatment is essential for managing the disease and improving overall health.

What is HER2-positive breast cancer?

HER2-positive breast cancer is a type of breast cancer that overexpresses a protein called human epidermal growth factor receptor 2 (HER2). This overexpression can promote the growth of cancer cells, leading to aggressive tumour behaviour.

Symptoms of HER2-Positive Breast Cancer

Let's explore some signs and symptoms of HER2-positive breast cancer:

Swelling or lump in the breast or armpit
Changes in the size, shape, or appearance of the breast
Skin changes on the breast, such as dimpling or redness
Nipple changes, including inversion or discharge

Causes of HER2-Positive Breast Cancer

The exact cause of HER2-positive breast cancer is not fully understood. However, certain risk factors can increase the likelihood of developing this subtype of breast cancer, including:

Genetic factors (BRCA gene mutations)
Hormonal factors
Age (increased risk with advancing age)
Family history of breast cancer

How is HER2-positive breast cancer diagnosed?

HER2-positive breast cancer is typically diagnosed through a combination of tests and procedures. Here is an overview of the common methods used for diagnosis:

Breast biopsy: A biopsy is performed to take a sample of the breast tissue for examination under a microscope. This can help determine if the cancer cells are HER2-positive.
HER2 testing: Once breast cancer is diagnosed, HER2 status is determined through HER2 testing. This test looks for the presence of the HER2 protein on the surface of cancer cells. The two main tests used are immunohistochemistry (IHC) and fluorescence in situ hybridization (FISH).
Imaging tests: Imaging tests such as mammograms, ultrasounds, or MRIs may be done to check the extent of cancer and whether it has spread to other parts of the body.
Blood tests: Blood tests can help assess various factors like hormone receptor status and overall health, which can influence treatment decisions.

Patients need to discuss all diagnostic options with their healthcare provider for a tailored approach to diagnosis and treatment.

Treatment Options for HER2-Positive Breast Cancer

Treatment options for HER2-positive breast cancer typically involve a combination of targeted therapies and other conventional treatments. Here are some common approaches:

Targeted therapy: Targeted therapy is a cornerstone of treatment for HER2-positive breast cancer. Drugs such as trastuzumab (Herceptin), pertuzumab (Perjeta), and ado-trastuzumab emtansine (Kadcyla) specifically target the HER2 protein, inhibiting cancer cell growth.
Chemotherapy: Chemotherapy may be used in combination with targeted therapy to eliminate cancer cells more aggressively.
Surgery: Surgery is a common treatment for HER2-positive breast cancer and may involve lumpectomy (removal of the tumour and surrounding tissue) or mastectomy (removal of the entire breast).
Radiation therapy: Radiation therapy uses high-energy rays to target and kill cancer cells left behind after surgery.

Conclusion

HER2-positive breast cancer poses unique challenges due to its aggressive nature, but advancements in targeted therapies have significantly improved treatment outcomes. Recognising the symptoms, understanding the causes, and exploring the various treatment options available are crucial in managing this subtype of breast cancer effectively.

Frequently Asked Questions About HER2 Breast Cancer

Q. What are the symptoms of HER2-positive breast cancer?
A. The symptoms of HER2-positive breast cancer are like those of other types of breast cancer and may include:

A lump or mass in the breast
Swelling of part or all the breast
Skin irritation or dimpling
Breast or nipple pain
Nipple retraction (turning inward)
Redness, scaliness, or thickening of the nipple or breast skin
Nipple discharge other than breast milk

Q. What causes HER2-positive breast cancer?
A. The main cause of HER2-positive breast cancer is not fully understood. However, it involves a genetic mutation that leads to an overexpression of the HER2 protein on the surface of breast cells, which promotes the growth of cancer cells. Risk factors may include family history, genetic mutations, and environmental factors.

Q. How is HER2-positive breast cancer diagnosed?
A. HER2-positive breast cancer is diagnosed through a combination of tests, including:

Biopsy
Immunohistochemistry (IHC) measures the amount of HER2 protein on the surface of cells.
Fluorescence in situ hybridization (FISH)

Q. What are the treatment options for HER2-positive breast cancer?
A. Treatment options for HER2-positive breast cancer include:

Targeted therapy
Chemotherapy
Surgery
Radiation therapy
Hormone therapy

Q. Are there any lifestyle changes that can help manage HER2-positive breast cancer?
A. While lifestyle changes cannot cure HER2-positive breast cancer, they can help manage symptoms and improve overall health. Recommended changes include:

Maintaining a healthy diet rich in fruits, vegetables, and whole grains
Regular physical activity
Avoiding smoking and limiting alcohol consumption
Managing stress through activities such as yoga, meditation, or counselling
Regular follow-ups and adherence to the treatment plan

References

https://www.mayoclinic.org/diseases-conditions/breast-cancer/expert-answers/breast-cancer/faq-20058066
https://my.clevelandclinic.org/health/diseases/25213-her2-positive-breast-cancer