From the paper:
?A doctor should be seen if changes in the breasts are noticed. The doctor may suggest a mammogram. A mammogram is a special x-ray of the breast that may find tumors that are too small to feel. If a lump in the breast is found, the doctor may need to cut out a small piece of the lump and look at it under the microscope to see if there are any cancer cells. This procedure is called a biopsy. If the biopsy shows that there is cancer, it is important that certain tests (called estrogen and progesterone receptor tests) be done on the cancer cells. Estrogen and progesterone receptor tests may tell whether hormones affect the way the cancer grows.
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