ER/PR +

ER+ means there are estrogen receptors on your tumor cells and the estrogen feeds/fuels the cell growth and division. This is considered a good thing because there are hormone blockers and inhibitors that can work to help reduce recurrence risk by starving the cells of its fuel. The higher the percentage given, the more dependent on the estrogen the cells are. PR+ Means there are progesterone receptors on the cancer cells. It's often assumed that this has the same meaning as estrogen+ but just a different hormone fueling the tumor. However, Its just the opposite. When the PR your body makes interacts with the receptors it actually interrupts the DNA signaling in the cancer cells and slows its growth. Bio-identical PR seems to have the same effect and is often used as treatment for stage IV ER/PR+ BC. Synthetic PR often found in prescription/nonprescription pills (like birth control pills) and creams is different than the PR our body makes and can increase risk of recurrence and is not recommended. Here’s a good visual on how all this works:

When you're PR+ anti-hormonal therapy will be recommended. They will only test your hormones to see if you're pre or post menopausal as those results dictate which anti-hormonals you can take. Unless you're post menopausal, routine hormone testing is useless as estrogen will still be present at significant levels in the blood stream-it just won't be able to interact properly with the receptors on the cells. The receptors being +/- have nothing to do with how much hormone you have circulating in your body.

Hope this helps!