1. Antiestrogens are commonly used in the treatment of hormone receptor-positive breast cancers.

抗雌激素常用于治疗荷尔蒙受体阳性的乳腺癌。

2. Tamoxifen is a well-known antiestrogen medication used to prevent the recurrence of breast cancer.

他莫氧芬是一种广为人知的抗雌激素药物，用于预防乳腺癌的复发。