Endoxifen Z-isomer is primarily utilized in medical research and therapeutic applications, particularly in the treatment of hormone receptor-positive breast cancer. It is an active metabolite of tamoxifen and exhibits potent anti-estrogenic properties, making it effective in inhibiting the growth of estrogen-dependent cancer cells. The Z-isomer is specifically studied for its enhanced bioavailability and stability compared to other forms, which contributes to its efficacy in clinical settings. It is often investigated for its potential to improve treatment outcomes and reduce side effects in patients undergoing hormone therapy. Additionally, its role in personalized medicine is being explored, as it may help tailor treatments based on individual metabolic profiles.