Progesterone Receptor Assay
(PR Assay)

Alternate Names

  • PRA
  • PgR

A small sample of cancer tissue will be taken from either a surgically removed breast tumor or a tissue biopsy, then examined with a microscope to determine the presence of specialized hormone receptors on the cell wall. This test is used to determine the best treatment for breast cancer. When progesterone receptors are present on cell walls, endocrine (hormone) therapy can be used as a treatment, along with removal of ovaries and/or adrenal glands. People who are PR positive have a better prognosis than those with PR negative breast cancer, and the prognosis is even better if estrogen receptors are also present. Test results take approximately one week to return from the lab.

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