Whats it mean to be steroid hormone receptor-positive?

ER/PR. The two steroid receptors checked on breast cancers are the estrogen (er) and Progesterone (pr) receptors. If present, the tumor is considered hormone sensitive/dependent/responsive and generally is less aggressive than receptor negative tumors. This also allows the use of hormonal therapy (tam, ais) as systemic therapy instead of or in addition to chemotherapy.
Breast cancer ? In the context of breast cancer, it is a good thing. It means there are markers on teh cell surface for the estrogen or prgesterone receptors. This means you can be treated with specific medicine and potends a better overall prognosis.