Er Positive Breast Cancer

Overview

ER-positive breast cancer is a type of breast cancer. The cancer cells have tiny docking sites called estrogen receptors. Estrogen, a hormone in your body, can attach to these sites and help the cancer grow. Doctors test the cancer tissue to see if it is ER-positive. This helps plan treatment.

ER-positive breast cancer is common. It is the most common subtype of breast cancer. About 7 in 10 breast cancers are hormone receptor-positive.

It can affect anyone with breast tissue. It is much more common in women, especially after menopause. Men can get breast cancer too, but it is rare.

Symptoms

Common symptoms

• A lump or thickening in the breast or armpit
• A change in the size or shape of the breast
• Skin dimpling, redness, or puckering
• A nipple that turns inward or changes shape
• Nipple discharge, especially if it is bloody
• Swelling, warmth, or pain in the breast
• A rash or scaly skin on the nipple

Symptoms in children

• Breast cancer is very rare in children and teenagers.
• Any breast lump or change in a child should be checked by a doctor.
• Most breast lumps in children are not cancer.

Symptoms in older adults

• Older adults may have the same breast changes.
• They may also feel very tired, lose weight without trying, or have general aches.
• These can have many causes. See your doctor if you notice changes.

Causes

Main causes

• ER-positive breast cancer happens when cells in the breast develop changes in their DNA over time.
• These changes let the cells grow out of control.
• The cancer cells have estrogen receptors, which are docking sites that let estrogen fuel their growth.
• This is not caused by something you did or by a personal failing.

Risk factors

• Being female
• Getting older
• Family history of breast or ovarian cancer
• Inherited gene changes such as BRCA1 or BRCA2
• Starting periods early or menopause late
• Never having a full-term pregnancy or having a first child after age 30
• Taking combined hormone replacement therapy for menopause for several years
• Drinking alcohol
• Being overweight or obese, especially after menopause
• Not being physically active
• Past radiation treatment to the chest

When to see a doctor

See a doctor urgently if:

• You notice a new lump or thickening in your breast or armpit
• You have nipple discharge, especially if it is bloody
• A nipple turns inward or changes shape
• Skin on the breast looks dimpled, red, or like orange peel
• You have persistent breast pain or swelling

Book a routine appointment if:

• You are due for breast screening
• You have a family history of breast or ovarian cancer
• You want to discuss breast cancer risk
• You have any breast change that worries you

Diagnosis

Doctors use a triple assessment: a breast exam, imaging scans, and a biopsy. A biopsy takes a small sample of tissue to check under a microscope. Lab tests on the biopsy show whether the cancer is ER-positive and what other features it has.

Tests that may be done

• Clinical breast exam
• Mammogram (X-ray of the breast)
• Breast ultrasound
• MRI if needed
• Core needle biopsy
• Lab tests for estrogen receptor (ER), progesterone receptor (PR), and HER2 status
• Grade and stage tests, such as scans

What to expect at your appointment

You may need several visits. Results can take a week or more. A specialist team will explain the results and treatment options. It can help to bring someone with you and write down questions.

Treatment

Treatment is planned for you. It depends on the stage, the size of the cancer, whether it is ER-positive, your age, and your general health. The aim may be to remove the cancer, lower the chance of it coming back, and help you feel well.

Self-care at home

• Eat regular meals and drink enough fluids
• Move gently and build up activity as you feel able
• Rest when tired
• Care for your skin during radiation as your team advises
• Ask for help with side effects
• Keep a list of questions for your care team

Medical treatments

Treatment may include surgery to remove the cancer and nearby lymph nodes, radiation therapy, hormone therapy for ER-positive cancer, chemotherapy, targeted therapy, or a combination. Hormone therapy blocks estrogen or lowers estrogen levels to help stop cancer cells from growing. Your team will explain the benefits and risks. No treatment is started without your consent.

When is surgery considered?

Surgery is often the first treatment. It may be a lumpectomy (removing the lump and some nearby tissue) or a mastectomy (removing the whole breast). Some people have chemotherapy before surgery to shrink the cancer. Lymph nodes under the arm may also be checked or removed.

Living with this condition

You will have regular follow-up visits. These may include breast exams, mammograms, and blood tests. Keep track of side effects and tell your team. Ask about bone health, since some hormone treatments can affect bones. If lymph nodes were removed, protect that arm from cuts, burns, and heavy strain.

Lifestyle tips

• Stay smoke-free
• Limit alcohol
• Be active most days
• Keep a healthy weight
• Get enough sleep
• Manage stress in ways that work for you

Diet and exercise

Eat a variety of foods, including vegetables, fruits, whole grains, and protein. Choose water. Aim for at least 150 minutes of moderate activity a week if you can, such as brisk walking. Build strength exercise twice a week. Start slowly and ask your team what is safe for you.

Mental health and emotional wellbeing

It is normal to feel worried, sad, or angry. Some people have anxiety or depression. Talking helps. If you have thoughts of harming yourself, call your local emergency number or a crisis line right away. Ask your team about counselling.

Prevention

You cannot fully prevent breast cancer. Some healthy habits may lower your risk. If you have a strong family history, ask your doctor about extra screening or other options.

Vaccines

There is no vaccine that prevents breast cancer.

Screening programmes

Breast screening can find cancer early, when treatment often works best. In the UK, the NHS breast screening programme invites women aged 50 to 71 for a mammogram every 3 years. Ask your local health service about screening where you live. If you have symptoms, do not wait for screening—see a doctor.

Complications

If left untreated

• The cancer can grow larger and spread to lymph nodes under the arm
• It can spread to other parts of the body, such as bones, lungs, liver, or brain
• Spread can cause pain, breathing problems, tiredness, or other symptoms
• Untreated cancer can become harder to treat

Long-term outlook

ER-positive breast cancer often responds well to treatment. Hormone therapy can lower the chance of the cancer coming back. Many people live for many years after treatment. Your outlook depends on the stage and other features, so ask your team about your situation. There is support for you at every step.

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