Final answer:
Hormone therapy decreases recurrence and contralateral breast cancer by 40% for estrogen-positive tumors.
Step-by-step explanation:
Hormone therapy, specifically the use of synthetic estrogens and progestins, decreases the recurrence and contralateral breast cancer by 40% for estrogen-positive tumors. This therapy involves medication that increases estrogen and progestin levels, and it can alleviate symptoms of menopause. However, there is ongoing debate and study regarding the benefits and risks of hormone replacement therapy, and it is generally only used when individuals first start showing signs of menopausal changes. It is recommended that people on hormone therapy have regular pelvic and breast exams.