Which type of breast cancer is associated with estrogen receptor positivity?

• A. Triple-negative breast cancer
• B. Estrogen receptor-negative breast cancer
• C. HER2-positive breast cancer
• D. Estrogen receptor-positive breast cancer

Answer: (D)

Estrogen receptor-positive breast cancer is characterized by the presence of estrogen receptors on the surface of the cancer cells. This means that the cancer can use estrogen, a key hormone in the body, to promote growth and proliferation. The identification of estrogen receptor positivity is crucial because it influences treatment options; for example, patients with this type of breast cancer often benefit from hormone therapies, such as aromatase inhibitors or selective estrogen receptor modulators, which can block the effects of estrogen and help control cancer growth.

In contrast, other types of breast cancer mentioned, such as triple-negative breast cancer, lack estrogen receptors, progesterone receptors, and HER2 protein overexpression. Estrogen receptor-negative breast cancer inherently does not express the estrogen receptors at all, making it unresponsive to hormone therapies targeting estrogen. Although HER2-positive breast cancer can coexist with estrogen receptor positivity, the specific mention of estrogen receptor positivity directly points to the correct answer. Hence, the focus on estrogen receptor positivity rightly identifies the corresponding breast cancer type.