Preoperative Testing of the Anti-Progesterone Mifepristone in Early Stage Breast Cancer

• ClinicalTrials.gov Identifier: NCT01138553
• Recruitment Status: Terminated
• First Posted: June 7, 2010
• Last Update Posted: July 8, 2019
• Sponsor: University of California, San Diego
• Information provided by (Responsible Party): Richard Schwab, University of California, San Diego

Tracking Information

• First Submitted Date: June 4, 2010
• First Posted Date: June 7, 2010
• Last Update Posted Date: July 8, 2019
• Actual Study Start Date: June 2010
• Actual Primary Completion Date: June 2014 (Final data collection date for primary outcome measure)
• Current Primary Outcome Measures (submitted: June 4, 2010): Change in proliferation by Ki-67 immunohistochemistry. [ Time Frame: 5-30 days ]
• Original Primary Outcome Measures: Same as current

Current Secondary Outcome Measures (submitted: June 28, 2010)

• Tumor size [ Time Frame: 5-30 days ]
• Expression of related targets following mifepristone exposure [ Time Frame: 5-28 days ]
  RNA-seq will be used to evaluate expression of steroid receptor isoform expression following drug exposure. These data will be compared with response as measured by proliferation change and tumor size.

Original Secondary Outcome Measures (submitted: June 4, 2010)

• Tumor size [ Time Frame: 5-30 days ]
• Safety/Tolerability [ Time Frame: 6-60 days ]
• Expression of related targets following mifepristone exposure [ Time Frame: 5-28 days ]
  RNA-seq will be used to evaluate expression of steroid receptor isoform expression following drug exposure. These data will be compared with response as measured by proliferation change and tumor size.

• Current Other Pre-specified Outcome Measures: Not Provided
• Original Other Pre-specified Outcome Measures: Not Provided

Descriptive Information

• Brief Title: Preoperative Testing of the Anti-Progesterone Mifepristone in Early Stage Breast Cancer
• Official Title: A Biomarker Study of Mifepristone in Early Stage Breast Cancer
• Brief Summary: The primary objective of this study is to identify the group of women with early stage breast cancer most likely to benefit from treatment with the selective progesterone receptor modulator (SPRM) mifepristone. This will be done by treating women briefly prior to planned surgery and examining the decrease in growth rate (measured by Ki-67 immunohistochemistry) in tumor samples taken before and after exposure to mifepristone.

Detailed Description

Secondary objectives of this study include; (1) Measuring objective response in tumor size with treatment, (2) Establishing the safety and tolerability of short term mifepristone exposure in early stage breast cancer patients, and (3) Performing exploratory studies of expression of related targets following drug exposure.

Anti-estrogen therapy has been a mainstay of breast cancer treatment for over three decades. It is highly effective and has modest toxicity, certainly in comparison to chemotherapy. The selective estrogen receptor modulator tamoxifen has the longest history but a number of aromatase inhibitors and the anti-estrogen fulvestrant are also in widespread use along with ovarian ablation for pre-menopausal women. Given the success of this approach, and the highly analogous parallel progesterone signal, it is unfortunate that anti-progesterone therapy has not been similarly pursued. Additionally, data from the Woman's Health Initiative trial reveal a potentially significant role for progesterone in breast cancer development and growth. Healthy postmenopausal women treated with the combination of estrogen and progesterone over a 5 year period were 24% more likely to develop invasive breast cancer and had larger tumors at diagnosis. Notably this effect was not seen in post-hysterectomy women treated with estrogen alone over nearly 7 years. In fact a non-statistically significant reduction in breast cancer incidence was observed with estrogen alone.

The anti-progesterone mifepristone has been found to reduce proliferation in normal breast tissue. Even a low dose of mifepristone (50mg every other day for 3 months) demonstrated a statistically significant reduction in breast cell proliferation (measured by Ki-67 immunohistochemistry).

Higher doses of mifepristone, 200mg daily, have been used in patients with metastatic breast cancer for durations of almost 2 years without serious toxicity. Response rates were only 11% but no grade 4 or 5 toxicities occurred. Some grade 3 toxicities occurred, including lethargy, nausea, vomiting, and skin rash. These rashes resolved with temporary discontinuation of drug and did not recur when drug was resumed.

As a whole these data strongly support research into anti-progesterone therapy for early stage breast cancer. To our knowledge this is the first such study.

• Study Type: Interventional
• Study Phase: Early Phase 1
• Study Design: Allocation: N/A; Intervention Model: Single Group Assignment; Masking: None (Open Label); Primary Purpose: Treatment

Condition

• Invasive Breast Cancer
• Ductal Carcinoma in Situ

Intervention

Drug: Mifepristone

200mg capsules daily for 5-28 days

Study Arms

Experimental: Mifepristone

Intervention: Drug: Mifepristone

• Publications *: Chlebowski RT, Hendrix SL, Langer RD, Stefanick ML, Gass M, Lane D, Rodabough RJ, Gilligan MA, Cyr MG, Thomson CA, Khandekar J, Petrovitch H, McTiernan A; WHI Investigators. Influence of estrogen plus progestin on breast cancer and mammography in healthy postmenopausal women: the Women's Health Initiative Randomized Trial. JAMA. 2003 Jun 25;289(24):3243-53. doi: 10.1001/jama.289.24.3243.

Recruitment Information

• Recruitment Status: Terminated
• Actual Enrollment (submitted: January 29, 2014): 4
• Original Estimated Enrollment (submitted: June 4, 2010): 66
• Actual Study Completion Date: October 2015
• Actual Primary Completion Date: June 2014 (Final data collection date for primary outcome measure)

Eligibility Criteria

Inclusion Criteria:

• Female identified as a candidate for primary resection of breast cancer (invasive or ductal carcinoma in situ) by a UCSD Breast Care Unit surgical oncologist
• Subjects must agree to contact the study coordinator prior to starting any new medications, vitamins or herbals during, or for 2 weeks following, mifepristone use
• Subjects must agree to abstain from alcohol use while on mifepristone
• Age ≥18
• ECOG performance status 0-1
• Prior to starting mifepristone subjects must have a negative urine (βHCG combo with on-board control) or blood pregnancy test and must be using one of the following acceptable means of birth control prior to starting study drug; Barrier methods or surgically sterile (tubal ligation, hysterectomy or partner with confirmed vasectomy). Alternatively the subject must be one year post-menopausal defined as greater than 12 months without a menstrual cycle
• Prior to starting mifepristone subjects must meet the following laboratory criteria; Granulocytes > 1.5E9/l (grade ≤ 1); Platelets ≥ 100E9/l; Hemoglobin > 10 g/dl (grade ≤ 1); Creatinine < 1.5x normal reference range (grade ≤ 1); SGOT, SGPT, alk phos ≤ 1x normal reference range; Total bilirubin < 1x normal reference range; Calcium < 11.5 mg/dl (grade ≤ 1); HBsAg = Negative; HCV Ab = Negative; INR < 1.5;
• Subjects must provide written informed consent

Exclusion Criteria:

• Not scheduled for surgery within 5 days of enrollment
• Subjects must not be on any therapy to treat breast cancer prior to surgical resection, specifically medications or recent (within 1 month of diagnostic biopsy) withdrawal of estrogen containing medication (eg. hormone replacement therapy)
• Subjects must not be on any medications, vitamins or herbals that are; potent inhibitors of cytochrome P450 CYP3A4, or sensitive substrates for cytochrome P450 CYP3A4
• Subjects may not have any history of significant cardiovascular, renal or hepatic disease requiring ongoing medical therapy or clinical intervention
• Subjects may not have a history of thrombophlebitis, thromboembolic disorder, or cerebral vascular disease.
• Subjects may not have any known hypersensitivity to mifepristone
• Subjects may not have a BMI > 39
• Subjects may not have an IUD (Intrauterine contraceptive device), chronic adrenal failure, concurrent long term steroid therapy, history of allergy to mifepristone, hemorrhagic disorders or concurrent anticoagulant therapy, or inherited porphyrias

Sex/Gender

• Sexes Eligible for Study: Female

• Ages: 18 Years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Contacts: Contact information is only displayed when the study is recruiting subjects
• Listed Location Countries: United States

Administrative Information

• NCT Number: NCT01138553
• Other Study ID Numbers: UCSD#100231
• Has Data Monitoring Committee: Yes
• U.S. FDA-regulated Product: Not Provided
• IPD Sharing Statement: Not Provided
• Current Responsible Party: Richard Schwab, University of California, San Diego
• Original Responsible Party: Richard Schwab/Assistant Clinical Professor of Medicine, Moores UCSD Cancer Center
• Current Study Sponsor: University of California, San Diego
• Original Study Sponsor: Same as current
• Collaborators: Not Provided

Investigators

• Principal Investigator: Richard B Schwab, MD; University of California, San Diego

• PRS Account: University of California, San Diego
• Verification Date: July 2019