New SERM Shows Promise in Advanced Breast Cancer

Excerpt:

“In women with estrogen receptor-positive, hormone-refractory metastatic breast cancer, oral Z-endoxifen hydrochloride, the potent metabolite of tamoxifen, provided substantial drug exposure regardless of CYP2D6 genotype, acceptable toxicity, and promising antitumor activity, researchers reported.

“Results from a phase I study in 38 patients with metastatic breast cancer demonstrated a clinical benefit rate (stable disease ≥ 6 months) of 26.3%. including a partial response by RECIST criteria in three patients who experienced progression during prior tamoxifen therapy, according to Matthew P. Goetz, MD, of the Mayo Clinic in Rochester, Minnesota, and colleagues.”

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Z-Endoxifen Shows Promise as New Treatment for Common Breast Cancer Type

Excerpt:

“Z-endoxifen, a potent derivative of the drug tamoxifen, could itself be a new treatment for the most common form of breast cancer in women with metastatic disease. This finding was reported from a clinical trial conducted by researchers at Mayo Clinic and the National Cancer Institute, and published in the Journal of Clinical Oncology.

“The final results of a first-in-human phase I study of Z-endoxifen in women with estrogen receptor positive  showed that the treatment was safe and resulted in tumor shrinkage in women whose tumors had progressed on standard anti-estrogen therapies, including tamoxifen.”

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