Skip to main content
x
Norris Cotton Cancer Center
In This Section
 
Phase II study of OsciLLation of ER activitY levels through sequential estradiol/anti-estrogen therapies in ER+/HER2- metastatic or advanced breast cancer (POLLY)
Principal Investigator (?)
Study Number
D14122
Summary
Before anti-estrogens such as tamoxifen were developed to treat estrogen receptor (ER)-positive breast cancer, high-dose estrogen therapies were used. This seems counterintuitive since anti-estrogens block ER function, while estrogens increase ER function, but these therapies are effective to similar extents for the treatment of metastatic ER+ breast cancer. Estrogen therapies are most effective against cancers that develop resistance to anti-estrogens, likely because such cancers have adapted to grow without ER function, and restoring ER function (with estrogen) is damaging to the cancer cells. In some patients with ER+ breast cancer that becomes resistant to anti-estrogens, treatment with the estrogen 17B-estradiol induces tumor response. Furthermore, when 17B-estradiol-sensitive tumors eventually become resistant to 17B-estradiol, switching back to anti-estrogen therapy is often effective. These observations suggest that cancers can alternate between anti-estrogen-sensitive and 17B-estradiol-sensitive states. The investigators hypothesize that treatment with alternating 17B-estradiol / anti-estrogen therapies on a defined 8-week / 16-week schedule will more effectively prevent cancer growth than continuous treatment with either type of therapy in patients with metastatic anti-estrogen-resistant ER+ breast cancer. 
Phase (?)
Phase III
Sponsor (?)
Available at the following location(s)

Lebanon

View more details from ClinicalTrials.gov.

Contact Information

For more information about a clinical trial, clinical trial eligibility, or informed consent, contact our research nurses by phone or email:

Please Note: Any eligibility criteria noted are subject to change. Our research nurses can provide you with the most current eligibility and exclusion criteria. Any study involvement to be undertaken must ultimately be determined on an individual basis.

0