Study for the Medical Council of Canada Qualifying Examination (MCCQE) I. Engage with flashcards and multiple-choice questions with detailed feedback. Prepare confidently!

Multiple Choice

Estrogen receptor positivity in breast cancer is generally associated with a which prognosis?

Estrogen receptor positivity signals that the tumor’s growth is driven by estrogen, which makes it more responsive to hormonal therapies such as tamoxifen or aromatase inhibitors. This responsiveness to endocrine treatment tends to reduce recurrence and improve survival, and ER-positive cancers are often better differentiated and slower-growing than ER-negative ones. While prognosis also depends on other factors like tumor size, nodal status, and HER2, the presence of estrogen receptors generally confers a better outlook due to the effective targeted therapy available.

Estrogen receptor positivity signals that the tumor’s growth is driven by estrogen, which makes it more responsive to hormonal therapies such as tamoxifen or aromatase inhibitors. This responsiveness to endocrine treatment tends to reduce recurrence and improve survival, and ER-positive cancers are often better differentiated and slower-growing than ER-negative ones. While prognosis also depends on other factors like tumor size, nodal status, and HER2, the presence of estrogen receptors generally confers a better outlook due to the effective targeted therapy available.