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A Randomized Phase 2 Non-inferiority Trial of (Z)-Endoxifen + Goserelin Versus Exemestane + Goserelin as Neoadjuvant Treatment for Premenopausal Women With ER+, HER2-, Ki-67>10% Breast Cancer and a Single Arm Phase 2 Study of (Z)-Endoxifen as Neoadjuvant Treatment for Premenopausal Women With ER+, HER2-, Ki-67 ≤ 10% Breast Cancer

  • Protocol Number: 202212154
  • Principal Investigator: Bagegni, Nusayba
  • Cancer Types: Breast

Learn more about this study at: clinicaltrials.gov

For more information on this trial, contact us here:

Phone
800-600-3606
Email
[email protected]

Brief Summary

This open-label research study is studying (Z)-endoxifen as a possible treatment for pre-menopausal women with ER+/HER2- breast cancer. (Z)-endoxifen belongs to a group of drugs called selective estrogen receptor modulators or SERM, which help block estrogen from attaching to cancer cells. This study has two parts: a pharmacokinetic part and a treatment part.

The PK part (how the body processes the drug) will enroll about 18 participants. All participants will take (Z)-endoxifen capsules daily. Twelve participants will be randomly assigned (50/50 chance) to take (Z)-endoxifen alone or (Z)-endoxifen with a monthly injection of goserelin a drug that temporarily stops the ovaries from making estrogen. This part will help determine the best dose of (Z)-endoxifen by measuring the drug levels in the blood and how long the body takes to remove it.

The treatment part has two parts:

* Part 2a will enroll 162 participants whose tumors have a high level of cell proliferation as indicated by the presence of a biomarker called Ki-67 (greater than 10%). Participants will be randomly assigned to one of two groups (50/50 chance):

1. a group receiving (Z)-endoxifen daily with a monthly injection of goserelin
2. a group receiving the current standard treatment of exemestane (an aromatase inhibitor that lowers estrogen) with a monthly injection of goserelin.
* The Part 2b will enroll about 30 participants whose tumors have low Ki-67 levels (10% or less). These participants will take daily (Z)-endoxifen alone without goserelin.

A key goal of the study is to see if (Z)-endoxifen can slow down or stop tumor growth as measured by a reduction in Ki-67 levels. Tumor tissue samples will be taken by breast biopsy after about 4 weeks of treatment to check levels of this biomarker. If the tumor shows signs of response, participants can continue treatment for up to 24 weeks or until they have surgery.

Study participation is up to 6 months (24 weeks of treatment) followed by surgery and a one-month follow up visit.

Protocol Interventions

Drug: (Z)-endoxifen