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February 10, 2012

Breast Cancer (cont.)

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Should I start chemotherapy before surgery?

The classical concept of breast-cancer treatment has been a sequence of tumor-removing surgery followed by chemotherapy and/or radiation therapy. The goal of surgery and radiation therapy is to destroy or remove the primary cancer. Follow-up chemotherapy is designed to eliminate any cancer cells, as yet undetectable, at remote sites.

Recently, there have been new findings suggesting a potential benefit in some patients when chemotherapy is started before surgery. However, initial chemotherapy (neoadjuvant chemotherapy) should be considered primarily in patients with larger tumors and those with strong evidence of lymph-node involvement at the time of initial diagnosis.

If you are enrolled in a clinical trial, the advantages and disadvantages of all protocols should have been explained to you, giving you the opportunity to make an informed decision.

If I am advised to have a mastectomy, what are the risks and benefits of immediate breast reconstruction?

If a mastectomy is necessary, immediate reconstruction offers a great psychological benefit to most women. However, as is often the case in medicine, there are trade-off risks which must be considered. If the reconstruction is done during the same surgery as the mastectomy (immediate reconstruction), the final results of the pathology tests on the removed tumor and tissue is not yet known and will not be known for at least a day or two.

There are sometimes findings on the final pathology report which make chest-wall radiation advisable in order to reduce the risk of local recurrence. If a prosthesis for the breast has been implanted, the radiation treatment will still work, but the radiation may significantly compromise the cosmetic appearance of the prosthesis. There may also be healing problems which delay chemotherapy, potentially increasing the risk of breast-cancer recurrence. These and other factors should be discussed and carefully considered before committing to immediate breast reconstruction.

Should my lymph nodes be removed?

Lymph nodes are small glandular structures that filter tissue fluids. They filter out and ultimately try to provide an immune response to particles and proteins which appear foreign to them. There are thousands of these nodes scattered in groups throughout the body. Each cluster is more or less responsible for the drainage of a particular region of the body.

The lymph nodes under the arm (axillary nodes) are the dominant drainage recipients from the breast. When cancer cells break free from a breast cancer, they may travel through the lymph tubes (vessels) to the lymph nodes. There, the cancer cells may establish a secondary growth site. The presence of cancer cells in the lymph nodes proves that cancer cells have traveled away from the primary breast tumor. Therefore, the presence or absence of cancer cells in these regional nodes is an important indicator of the future risk of recurrence. This information is often important in making decisions about whether to use chemotherapy and what type of chemotherapy should be employed.

Unfortunately, removal of the lymph nodes also carries a potential risk of lymphedema, a condition that may cause the arm to swell. Lymphedema can occur early after surgery or many years later. It can be a difficult and disabling condition. Here again, there are trade-offs in risk. When more lymph nodes are removed, more accurate the information about tumor spread is obtained and the chance for tumor recurrence is less. But there is a greater incidence of lymphedema.

There are alternatives to standard lymph-node removal (called axillary node dissection). These alternatives should be considered in each patient's situation. They include

  1. replacing standard axillary-node removal with sentinel node biopsy (explained below);


  2. not doing lymph-node removal in patients who will receive chemotherapy anyway based on other information; and


  3. not doing lymph-node removal in patients with very small or "favorable" tumors.

Again, these alternatives must be selectively applied with the benefits and risks carefully evaluated.


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