Usually often tells breast cancer patients with to tell you about large-segment and large-segment. So, I believe many people are confused about what large-segment is. Large segmentation is a professional term for radiotherapy. First of all, we need to understand what segmentation means. For example, a piece of 8-inch cake is divided into 4 pieces and divided into 8 pieces. The size of each piece is different. Each piece divided into four pieces must be large. We can call it large segmentation. So is it a small segmentation that is divided into 8 pieces? No! In radiotherapy, it is called routine segmentation.
Conventional segmentation means that the dose of radiotherapy is 2Gy (Gy is the dosage unit), so the dose of radiotherapy is greater than 2Gy, which is called a large segmentation. The commonly used dose of radiotherapy in breast cancer is 2.67Gy.
Then the question arises again, why use large segmentation? First of all, for the same patient, the total dose of radiotherapy is constant. If the dose of each radiotherapy increases (using large segmentation), the total number of radiotherapy will be reduced, which greatly reduces the number of times the patient goes back and forth, and the cost will also be reduced. But the premise is that using large segmentation radiotherapy should be as safe as conventional segmentation! efficient!
So for breast cancer, is the big segmentation effective and safe? The answer is yes! Otherwise, a large division would not have come into being.
1. Breast cancer post-birth conservation radiotherapy
For breast cancer patients, large-segment radiotherapy was first applied to breast conservation patients. Before large-segment, radiotherapy after breast conservation was generally 25 times for the entire breast radiotherapy, and 5 more times for the local tumor bed, a total of 30 times, a total of 35 days. It has been too long. Later, after long-term research, it was found that a single dose of 2.67Gy, a total of 15 radiotherapy sessions, followed by local additions (2Gy each) can achieve the same effect (2.9Gy once, 15 times, followed by 2.9 times, 3 times; or 2.66 times, 16 times, followed by dosage, overall similarity) Both the efficacy and side effects are similar to conventional segmented radiotherapy. At the same time, large segmented radiotherapy can also reduce the dose of radiation in normal tissues, so large segmented radiotherapy has gradually become the mainstream of radiotherapy after breast conservation surgery.
2. Radical (full incision) radiotherapy after surgery
Since large-segment radiotherapy after breast conservation is safe and effective, is large-segment radiotherapy suitable for radiotherapy after total incision? Radical breast cancer surgery was routinely radiotherapy 25 times, including the clavicle area and the inner mammary lymph node drainage area, depending on the condition. The current major segmentation of radiotherapy after radical breast cancer is 2.9Gy once, a total of 15 times. Studies have shown that its safety and effectiveness are comparable to conventional segmentation. However, there are relatively few units that use large-segment radiotherapy after radical surgery. The first is because the research time is late, and the second is that some doctors think that the research is insufficient, and routine segmentation is safer and more effective. In short, as the research deepens, its application will become more and more common.
