Testosterone and breast cancer prevention

Area of Science:

• Endocrinology
• Oncology
• Women's Health

Background:

• Testosterone (T) is a key hormone in women, influencing breast tissue proliferation via androgen receptors (AR).
• T can convert to estradiol (E2), potentially increasing breast cancer (BCA) risk, while androgens generally offer protection.
• An imbalance favoring estrogens over androgens disrupts breast homeostasis and may elevate BCA risk.

Purpose of the Study:

• To evaluate the role of testosterone (T) in breast cancer (BCA) prevention and treatment.
• To assess the efficacy of T, alone or with anastrozole (A), in managing hormone deficiency symptoms and BCA.
• To investigate the direct impact of T on BCA tumor size.

Main Methods:

• Clinical data analysis of women treated with pharmacological doses of T, with or without anastrozole (A), via subcutaneous implants.
• Evaluation of BCA incidence in women receiving T-based therapy.
• Assessment of T+A implants placed in breast tissue surrounding tumors to measure tumor size reduction.

Main Results:

• Women treated with T (alone or with A) showed a reduced incidence of BCA.
• T combined with A effectively managed hormone deficiency symptoms in BCA survivors without increasing recurrence risk.
• Subcutaneous implants of T+A in breast tissue significantly reduced BCA tumor size, demonstrating a direct therapeutic effect.

Conclusions:

• Testosterone (T) demonstrates a direct antiproliferative, protective, and therapeutic effect against breast cancer (BCA).
• T-based therapies, particularly in combination with anastrozole (A), show promise for BCA prevention and treatment.
• Hormonal balance, with adequate androgen levels, is crucial for maintaining breast health and potentially preventing or treating BCA.