Chemotherapy at this grade may not always be necessary and radiation alone may be of the most benefit with a low-grade cancer. I would strongly consider having the lymph nodes sampled to know if there is any concern of spread, before making the decision of chemotherapy. There are options. Hormonal therapy such as tamoxifen, which you should discuss with your physician. And if you have not at this point, I would also recommend consultation with a medical oncologist to discuss treatment options of chemotherapy versus hormonal therapy prior to making your final decision.
Radiation actually is set to target breast tissue alone.
There are instances when lymph nodes are radiated but usually that is only done when it has proven to be spread to the lymph nodes. We'll first discuss treating the in situ carcinoma. That is when the cancerous cells are maintained within the walls of the ducts and have not spread out to the rest of the breast tissue. In situ carcinoma is treated most often with lumpectomy followed by radiation. Therefore, lymph node biopsies are usually not required.