The Three ‘Tools’ for Treating Breast Cancer
There are three categories of treatment for breast cancer: surgery, radiation therapy, and drug therapy. Each of these tools has a different role.
The choice of treatment is based on many factors. Aggressive cancers may be treated with surgery, radiation therapy and several types of drug therapy. Less aggressive cancers may be treated with surgery only.
Different types of operations that may be used for breast cancer are listed below. A given patient will have some but not all of these surgeries.
Lumpectomy: removal of the cancerous lump only, also known as partial mastectomy
Mastectomy: complete removal of the breast
Sentinel lymph node surgery: removal of one or a few lymph nodes from the armpit area
Axillary dissection: removal of many lymph nodes from the armpit area
Sentinel lymph node surgery: removal of one Breast reconstruction: plastic surgery to re-create a breast after mastectomy
Radiation therapy is a type of focused energy.
Radiation therapy is useful because cancers are much more vulnerable to radiation than healthy tissues.
Radiation is safest when given in many small treatments over one or more weeks.
Radiation is extremely effective in eliminating small amounts of breast cancer left behind after surgery or chemotherapy. Radiation may be given to the breast or chest area, and sometimes to the lymph node areas. Generally, the cure rate is higher when radiation is added to surgery for breast cancer. Some patients cannot be cured without radiation therapy.
There are two main categories of radiation therapy used for breast cancer.
- External Beam Radiation Therapy is administered with specially shaped ‘beams’ of focused energy from a machine called a linear accelerator. It is very effective in treating larger areas of the body such the whole breast or the surrounding lymph node areas.
- Brachytherapy (internal radiation) is administered by temporarily placing a tiny radioactive source inside the breast after lumpectomy. It allows for very ‘targeted’ treatment of the area at-risk for containing residual cancer, with less radiation scatter to the nearby healthy tissues. One or more flexible tubes called catheters are temporarily placed within the breast to guide and contain the radiation source. Treatments are 5-10 minutes each and are usually given twice daily for 5 days.
Most radiation therapy treatments for breast cancer fall into one of four categories:
- External Beam Radiation Therapy to the intact breast after lumpectomy as part of breast conservation. Breast conservation is treating the cancer while preserving the breast.
- Breast Brachytherapy delivered to the breast after lumpectomy as part of breast conservation. Breast Brachytherapy is faster (one week) than External Beam Radiation Therapy (six weeks) and may be an option for some patients with early breast cancer.
- External Beam Radiation Therapy delivered to the chest and lymph node areas after surgery for more advanced breast cancers. This might include patients with large cancers or those with many involved lymph nodes.
- Palliative Radiation Therapy for treatment of symptoms from cancer that has spread to another organ, such as a cancer spot in a bone causing pain.
Drug Therapy for Breast Cancer
Drug Therapy is our term for drugs used to eliminate cancer from the body. Drugs travel throughout the body and eliminate cancer not reachable with surgery and radiation. More importantly, these drugs can attack and eliminate cancer cells that are too small to see on any scan. Some patients cannot be cured without drug therapy.
These drugs can be effective against breast cancers that are stimulated by estrogen, a female hormone. Cancers stimulated by estrogen are described as ‘estrogen-receptor positive,’ usually abbreviated as ‘ER positive.’ Estrogen-blocking drugs are usually given for many years. Most are taken as a pill. Commonly used examples are tamoxifen and anastrazole.
These are powerful drugs. Many are synthetic versions of plant and animal toxins. They can be very effective but may cause more side effects. These side effects are generally tolerable and temporary. Chemotherapy is given for several months, and the drugs may be given by vein or in pill form. Some chemotherapy drugs include cyclophosphamide, taxotere, doxorubicin, and carboplatin. Usually two or three are used in combination. A combination is abbreviated using the first letter of each drug. For example, taxotere and carboplatin used together is referred to as TC.
Targeted or Biologic Therapy.
These drugs attack specific proteins present in some (but not all) breast cancers. The concept is like having the right key for a certain lock. The Targeted Therapy drug is the ‘key.’ Some breast cancers have the ‘lock’ but others do not. These drugs may be given with chemotherapy or as stand-alone treatment. Examples include trastuzumab and lapatinib.
When and How Are These Drugs Used.
Some patients do not receive drug therapy, because there is little or no concern that invisibly small amounts of cancer are left behind after surgery or radiation. Other patients may be offered an estrogen-blocking drug alone, chemotherapy alone, or some combination of two (or all three) types of drug therapy. Many things factor into the doctor’s decision to recommend one drug or another.
What is Early Stage Breast Cancer?
Early stage breast cancer is a small or medium-sized breast cancer with no or limited lymph node involvement. Early stage breast cancers include Stage I and Stage II breast cancers.
Early stage breast cancer is very curable. Surgery has a central role. Radiation therapy and/or drug therapy is usually recommended following surgery. Basic information about surgery, radiation therapy, and drug therapy can be found in the section titled Highlights of Breast Cancer Treatment.
Breast Conservation or Mastectomy
Our physicians were early strong advocates for breast conservation therapy. In St. Louis, Dr. Kuske was a leader in elevating the breast conservation rates from a mere 15% to over 50% during his 7-year tenure at Washington University and Barnes Hospital.
What Your Surgeon is Telling You
Surgery is a key part of any curative treatment for breast cancer. There are three types of surgery a woman with breast cancer might undergo as part of the treatment for the cancer. These are mastectomy (with or without breast reconstruction), lumpectomy, and surgery to examine the lymph nodes in the armpit area.
The most modern method of examining these lymph nodes is called sentinel lymph node surgery. Sentinel lymph node surgery is a special way of finding and removing only the one or two lymph nodes that filter the cancer. This is a very accurate way to determine if the cancer has spread to the axillary lymph nodes. The risks of sentinel lymph node surgery are lower than the older (but still useful) method of axillary dissection.
The traditional surgery for examining the lymph nodes removes a great many of the axillary lymph nodes. This is called an axillary dissection. In an axillary dissection, ten or more lymph nodes might be removed. Axillary dissections have a higher risk of side effects compared to sentinel node surgery. The main risk of axillary dissection is long term arm swelling called lymphedema. This is uncommon with axillary dissection and quite rare with sentinel lymph node surgery. Other side effects of these surgeries include arm pain and stiffness (usually temporary) and numbness on the inside of the upper arm.
If there are many lymph nodes with cancer left in the axilla, they can grow and form a mass, which can damage the nerves to the arm and cause arm swelling. Such an axillary recurrence can cause great pain and misery and is best prevented. For this reason, patients with proven cancer in the lymph nodes are often treated with removal of those lymph nodes by a full axillary dissection, rather than just a sentinel lymph node surgery which might leave cancer-containing lymph nodes behind. If doctors know beforehand that there is cancer in the axillary lymph nodes, a sentinel lymph node surgery may not be done at all; instead, an axillary dissection is performed. Usually, this is not the case because very few women have obvious cancer in their lymph nodes, and if there is cancer in the lymph nodes, it is invisibly small and only found after examination under a microscope.
But almost all doctors now agree that patients without cancer in the sentinel lymph nodes do not need axillary dissection. This is because such patients almost never have axillary recurrence, and even when it does occur it can be controlled with surgery later.
Almost all women with breast cancer will have at least one of these three types of surgeries – mastectomy, lumpectomy, and/or removal of axillary nodes either by sentinel node surgery or axillary dissection. For most patients the surgery will involve either lumpectomy and sentinel lymph node surgery, or mastectomy and sentinel lymph node surgery. If the sentinel lymph nodes surgery shows that the nodes have cancer within them, a full axillary dissection is often recommended. After surgery other treatments with radiation therapy or drug therapy may follow.
Treating Breast Cancer with TrueBeam
At our Gilbert Office, Arizona Breast Cancer Specialists is proud to be the first center in the Southwest to offer patients the TrueBeam STx, an advanced radiosurgery system from Varian Medical Systems. It was engineered from its inception to perform noninvasive, image-guided procedures with pinpoint accuracy and precision. It works by choreographing highly sophisticated imaging, treatment delivery and motion management technologies making it possible to deliver treatments more quickly while compensating for tumor motion. This opens the door to new possibilities for the treatment of challenging cancers throughout the body including those in the breast.
How does radiosurgery with TrueBeam work?
Our physicians may prescribe treatment with TrueBeam STx for many reasons. It can deliver treatments up to 50 percent faster with a dose delivery rate of up to 2400 monitor units per minute, double the maximum output of earlier, industry-leading systems. This makes it possible to offer greater patient comfort by shortening treatments and to improve precision by leaving less time for tumor motion during dose delivery.
The treatment beam is generated by a machine called a medical linear accelerator. This machine shapes beams of energy with varying intensities generated by the machine.
The treatment beam can be aimed at a tumor from multiple angles to hit the target in a complete three-dimensional manner. In fact, TrueBeam STx's treatment beam can be delivered with submillimeter accuracy and varying intensity. The idea is to deliver the lowest dose possible to the surrounding healthy tissue, while still delivering the maximum dose to the tumor.
If you are being treated at the Gilbert ABCS Office, be sure to ask your physician if TrueBeam STx is right for you.