Breast cancer is classified into stages based on details about your tumor. In general, stage 2 breast cancer is considered early-stage cancer. The tumor is larger than in stage 1, has spread to nearby lymph nodes, or both.

As part of a breast cancer diagnosis, doctors use the cancer stage to help decide which treatment options to recommend and to estimate prognosis (outlook).

In this article, we’ll look at what stage 2 breast cancer means, common stage 2 breast cancer treatment options, and factors that affect prognosis.

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How Is Breast Cancer Stage Determined?

Breast cancer staging starts with the TNM staging system. TNM stands for tumor, node, metastasis. Your doctor may order imaging, such as a mammogram, and other testing to assess the following:

• Tumor — How large is the primary tumor?
• Node — Are there cancer cells in nearby lymph nodes?
• Metastasis — Has the cancer spread to other parts of the body?

Based on how far the cancer has spread, the stages of breast cancer range from 0 to 4. A higher number means more advanced cancer. For example, stage 3 breast cancer is more advanced than stage 2.

Determining the best treatment options also requires information such as:

• Hormone receptor status — Do cancer cells contain a type of protein known as an estrogen receptor (ER) or a progesterone receptor (PR)?
• Tumor grade — How do the abnormal cancer cells look compared to normal cells?
• HER2 status — Do cancer cells have high or low levels of the growth protein called HER2?

Your oncologist may also use the Oncotype DX test for some hormone receptor-positive, HER2-negative early-stage breast cancers. This type of gene test helps show the risk of the cancer coming back and whether chemotherapy is likely to help.

Stage 2 Breast Cancer Treatment Options

Stage 2 breast cancer treatment usually includes surgery. Many people also receive systemic therapy — medicines that travel through the body. Systemic therapies include chemotherapy, hormone therapy, targeted therapy, or immunotherapy.

Systemic therapy may be given before surgery, after surgery, or both. Systemic treatment before surgery is often recommended for people with:

• Larger tumors
• Triple-negative breast cancer (TNBC)
• HER2-positive breast cancer

Surgery

Treatment for stage 2 breast cancer usually includes either breast-conserving surgery or mastectomy. In breast-conserving surgery, also called a lumpectomy or partial mastectomy, a surgeon removes the breast tumor and some of the surrounding normal tissue to help make sure no cancer cells are left at the edges of the removed tissue.

A mastectomy involves removing all of the breast tissue. This procedure may be recommended when larger breast tumors can’t be easily removed or when the tumor is large compared with the size of the breast. Some people may choose to have breast reconstruction surgery after a mastectomy.

Nearby lymph nodes are also checked with a sentinel lymph node biopsy or an axillary lymph node dissection. The sentinel lymph node is the first lymph node that tumor cells are likely to reach. If no cancer is found in the sentinel lymph nodes, other lymph nodes usually don’t need to be removed. If a sentinel lymph node biopsy shows cancer, some people may need more lymph nodes removed in a procedure called an axillary lymph node dissection.

Radiation

For people who have breast-conserving surgery, radiation therapy (also called radiotherapy) is commonly used after surgery. After a mastectomy, radiation is used more selectively, such as when cancer is found in the lymph nodes or when the cancer care team believes radiation may be helpful. In selected cases, radiation therapy can also be given during surgery, a procedure called intraoperative radiation therapy.

Chemotherapy

Chemotherapy may be given before surgery, after surgery, or both. Treatment before surgery can shrink larger tumors, which may make breast-conserving surgery possible instead of mastectomy.

Before-surgery chemotherapy is often preferred for HER2-positive or TNBC stage 2 disease.

For hormone receptor-positive and HER2-negative stage 2 breast cancer, certain gene panel tests may help determine whether chemotherapy is likely to be useful.

Hormonal Therapy

Some breast cancers have hormone receptors, such as estrogen receptor (ER) or progesterone receptor (PR). Hormones can attach to these receptors and help cancer cells grow. Hormone therapy may be recommended for hormone receptor-positive breast cancer. However, hormone therapy doesn’t help treat hormone receptor-negative tumors.

Hormone therapy may include tamoxifen or an aromatase inhibitor. These medications work in different ways to block or lower the hormones that can help some breast cancers grow. Tamoxifen can be used before or after menopause. Aromatase inhibitors are mainly used after menopause but may also be used before menopause along with treatment that stops the ovaries from making estrogen.

Targeted Therapy and Immunotherapy

Targeted therapy drugs work by focusing on specific features of cancer cells. For example, some targeted drugs are used for high-risk hormone receptor-positive, HER2-negative cancer, while HER2-targeted drugs are used for HER2-positive disease.

Depending on the type of breast cancer and other factors, targeted therapy and immunotherapy options for stage 2 breast cancer may include:

• Abemaciclib (Verzenio)
• Ado-trastuzumab emtansine (Kadcyla)
• Fam-trastuzumab deruxtecan-nxki (Enhertu)
• Neratinib (Nerlynx)
• Olaparib (Lynparza)
• Pertuzumab (Perjeta)
• Pembrolizumab (Keytruda)
• Ribociclib (Kisqali)
• Trastuzumab (Herceptin and its biosimilars)

Clinical Trials

People with stage 2 breast cancer may also consider participating in clinical trials. For those with early-stage breast cancer such as stage 2, clinical trials may be focused on finding more effective treatments or reducing side effects. Joining a clinical study is also a way to help further cancer research.

Treating Triple-Negative Breast Cancer

If breast cancer cells are negative for ER, PR, and HER2, the cancer is called triple-negative breast cancer. TNBC cells don’t have estrogen or progesterone receptors and don’t have high levels of HER2. TNBC doesn’t respond to hormone therapy or HER2-targeted drugs, and it can be more challenging to treat than some other breast cancer types because fewer targeted therapies are available.

For stage 2 TNBC, pembrolizumab is typically used with chemotherapy before surgery and then continued after surgery. If cancer is still found after treatment before surgery, some people may also be offered capecitabine. For people with a BRCA gene mutation, olaparib may be another option.

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