A Phase 2 interventional study of Tamoxifen and Tamoxifen (Nolvadex) in High Risk for Invasive Breast Cancer, sponsored by Rutgers, The State University of New Jersey. Active, not recruiting at 1 site in United States. Open to participants aged 30 Years and older. Per ClinicalTrials.gov, last updated 2026-09-08.
Sponsored by Rutgers, The State University of New Jersey · Phase 2, Interventional, and Treatment
The purpose of this study is to learn whether a shorter-duration, low-dose tamoxifen regimen can reduce the risk of developing breast cancer or breast cancer recurrence in post-menopausal women who are at increased risk for breast cancer.
The patients to be entered in this protocol will be post-menopausal women diagnosed with ductal carcinoma in situ (DCIS), lobular carcinoma in situ (LCIS), atypical ductal hyperplasia, and atypical lobular hyperplasia (ALH) OR post-menopausal women with an elevated 5-year Gail model risk (> 1.66%) but with no prior history of breast intraepithelial or invasive cancers
Potential subjects will be recruited by the treating investigator and approached to participate in the study during consultation for the treatment and management of their disease as an alternative treatment option.
Subjects from all racial/ethnic groups are eligible for this study if they meet the eligibility criteria
14,825 studies on the registry are indexed under Breast Neoplasms; 3,319 are open to participants now.
This study's planned enrollment of 250 is above the median of 72 across 10,896 interventional studies indexed under Breast Neoplasms.
Browse Breast Neoplasms studies →Rutgers, The State University of New Jersey is the lead sponsor of 506 studies on the registry; 131 are open to participants now.
Of its 39 completed or terminated interventional studies of FDA-regulated products, 31 (79%) have results posted.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
A. women diagnosed with ductal carcinoma in situ (DCIS), Lobular carcinoma in situ (LCIS), atypical ductal hyperplasia (ADH), and atypical lobular hyperplasia (ALH) who meet the following criteria:
DCIS/LCIS
B. Patients at increased risk of breast cancer based on Gail model criteria (5- year risk ≥1.66%) without prior history of DCIS, LCIS, atypical hyperplasia, or invasive breast cancer.
2. No history of pathogenic germline mutations that increase the lifetime risk of breast cancer. If genetic testing was not done, then patients must have no more than two first-degree relatives diagnosed with breast cancer.
3. Should have received radiation for DCIS, if recommended by the radiation oncologist.
4. No prior history of invasive carcinoma, DCIS, LCIS, ADH, and/or ALH in bilateral breasts.
5. performance status ≤ 2 6. No use of hormone replacement therapy for at least 5 years.
Exclusion Criteria:
Prior treatment with tamoxifen or an aromatase inhibitor.
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Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Postmenopausal
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Adjuvant and neoadjuvant
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECOG performance status
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Life expectancy
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Drug: Tamoxifen · Drug: Tamoxifen (Nolvadex)
Low-dose tamoxifen will be administered at 10 mg orally every other day for 18 months.
Low dose Tamoxifen for 18 months.
Low Dose Tamoxifen
To evaluate the efficacy of a de-escalated, 18-month regimen of low-dose tamoxifen (10 mg every other day) in reducing the risk of disease recurrence or invasive breast cancer in post-menopausal women with breast intraepithelial neoplasia or an elevated 5-year Gail model risk.
Time frame: 18 Months
Evaluation of Tamoxifen Tolerability
Incidence of endometrial cancer or thromembolic events.
Time frame: 18 months
To evaluate the Incidence of other invasive events
Incidence of LCIS or atypical hyperplasia in ipsilateral or contralateral breast.
Time frame: 18 months
Plan to share: No
No publications or documents are linked to this record.
Started Sep 2026 (actual). Primary completion is estimated for Jul 2028, 22 months after the start.
Of 1,070 non-industry phase 2 interventional studies under Breast Neoplasms, half reached primary completion within 56 months of starting (the median), counting those still running; a quarter within 34 and three quarters within 87. This study's planned 22 months is below that.
Counting every sponsor, half of 1,302 studies reached it within 51 months; a quarter within 30 and three quarters within 82.
How these figures are worked out, and which studies are left out of them.
This study is active, not recruiting, as verified in Sep 2026. You cannot join it, but the record below documents what was studied.
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Studies of the drug tested here: Tamoxifen
Rutgers, The State University of New Jersey →