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Why do some breast cancer patients quit hormone therapy? new study aims to find out

NCT ID NCT07180914

Knowledge-focused Sponsor: Zhejiang Cancer Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 26, 2026 · Updated 1 time

Summary

This observational study will follow 300 premenopausal women with HR-positive early breast cancer who are already receiving ovarian function suppression (OFS) therapy as part of their routine care. Researchers want to see how many patients stop OFS within two years and why, and whether the length of treatment affects cancer outcomes. The goal is to improve long-term treatment adherence and prognosis.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Ovarian Function Suppression (OFS) therapy
What this could lead to
If successful, this study could help doctors understand why some patients stop OFS therapy and how treatment duration affects breast cancer recurrence, leading to better support strategies.
What could go wrong
This is an observational study, not a controlled trial, so it cannot prove cause and effect. Results may be influenced by patient differences and real-world factors.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 300 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Oct 2025

An estimate. Start dates often move.

Expected to finish

Dec 2029

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

1. Female breast cancer patients who were premenopausal at the time of surgery. 2. Newly diagnosed patients with invasive breast cancer, TNM stage I-III. 3. HR-positive (defined as ER ≥ 10% and/or PR ≥ 10%). 4. Patients who have undergone radical mastectomy and are planning to receive OFS treatment. 5. Have received (neo)adjuvant chemotherapy and radiotherapy. 6. ECOG PS score of 0-1. 7. Complete medical records. 8. Willing to accept long-term follow-up. 9. Any adverse events that occurred during adjuvant chemotherapy (if applicable) have recovered or decreased to grade 1 (according to CTCAE v5.0) at the start of OFS treatment.

Ages

Children (under 18), adults (18 to 64) and older adults (65 and over)

Sex

Female participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Female breast cancer patients who were premenopausal at the time of surgery. 2. Newly diagnosed patients with invasive breast cancer, tumor node metastasis(TNM) stage I-III. 3. HR-positive (defined as ER ≥ 10% and/or progesterone receptor(PR) ≥ 10%). 4. Patients who have undergone radical mastectomy and are planning to receive OFS treatment. 5. Have received (neo)adjuvant chemotherapy and radiotherapy. 6. Eastern Cooperative Oncology Group Performance Status(ECOG PS) score of 0-1. 7. Complete medical records. 8. Willing to accept long-term follow-up. 9. Any adverse events that occurred during adjuvant chemotherapy (if applicable) have recovered or decreased to grade 1 (according to CTCAE v5.0) at the start of OFS treatment. Exclusion Criteria: 1. Simultaneously participating in another blinded clinical study. 2. Presence of other active malignant tumors or multiple primary cancers. 3. Pregnant or lactating women. 4. Other conditions that the investigator deems unsuitable for inclusion in the study. 5. Planning to use systemic therapies not described in the study cohort during the endocrine therapy phase (such as, but not limited to, chemotherapy, Antibody-Drug Conjugates(ADCs), or immunotherapy).

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Conditions

The condition(s) this trial relates to.

breast neoplasm female breast carcinoma hormone receptor-positive breast cancer

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Breast cancer females

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  2. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

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