What is a key function of the hormone therapy prescribed for estrogen receptor-positive tumors?

In the context of estrogen receptor-positive tumors, the primary function of hormone therapy is to block estrogen receptor sites. This approach is critical because estrogen can promote the growth and proliferation of these specific types of tumors. By blocking the receptors, the therapy prevents estrogen from binding and activating the cancer cells, thus reducing the likelihood of tumor growth and progression.

The effectiveness of this treatment lies in its ability to starve the tumor of the hormones it relies on for continued growth. This targeted therapy is a cornerstone in the management of breast cancers that are dependent on estrogen for their growth. As a result, patients receiving this form of treatment can experience a decrease in tumor size or stabilization of the disease, which is essential for improving outcomes in those with estrogen receptor-positive cancer.