Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Breast Cancer ?
    ### Response:
    There are two types of breast-conserving surgery -- lumpectomy and partial mastectomy. - Lumpectomy is the removal of the tumor and a small amount of normal tissue around it. A woman who has a lumpectomy almost always has radiation therapy as well. Most surgeons also take out some of the lymph nodes under the arm.
    