This randomized research trial studies how well serum tumor marker directed disease
monitoring works in monitoring patients with hormone receptor positive Her2 negative breast
cancer that has spread to other places in the body. Using markers to prompt when scans should
be ordered may be as good as the usual approach to monitoring disease.
Anatomic Stage IV Breast Cancer AJCC v8, Estrogen Receptor Positive, HER2/Neu Negative, Progesterone Receptor Positive, Prognostic Stage IV Breast Cancer AJCC v8, Elevated CA15-3 or CEA or CA27-29