A patient with breast cancer has a lumpectomy with sentinel lymph node dissection that is positive for cancer. You explain that, of the other tests done to determine the risk for cancer recurrence or spread, the results that support the more favorable prognosis are (select all that apply)
a. well-differentiated tumor.
b. estrogen receptor–positive tumor.
c. overexpression of HER-2 cell marker.
d. involvement of two to four axillary nodes.
e. aneuploidy status from cell proliferation studies.
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