Clinical trials
Letrozole clinical trials
Below are recruiting letrozole clinical trials, each written for real people, not researchers. We’re tracking 103 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07174336RecruitingPhase 3
Testing Tersolisib with other treatments for advanced breast cancer
This trial tests a new study drug called Tersolisib combined with other anti-cancer treatments for people with advanced breast cancer that has a specific gene change (PIK3CA). The goal is to see if the combination can help shrink or slow the cancer.
Anchorage, AlaskaAges 18 years+ - NCT04985266RecruitingPhase 2
Watch blood DNA for early breast cancer return, then add palbociclib
This study checks for early signs that ER-positive, HER2-negative breast cancer may be coming back by testing your blood for cancer DNA. If signs are found, it tests whether adding palbociclib plus fulvestrant works better than standard hormone therapy alone to prevent recurrence.
AngersAges 18 years+ - NCT04282031RecruitingPhase 1/Phase 2
BPI-1178 for advanced breast cancer or solid tumors
This early-phase study tests BPI-1178 in people with advanced (stage 4 or hard-to-treat) solid tumors, including HR+/HER2- breast cancer. It looks at how well the treatment works and how safe it is, especially after standard treatments have stopped working or aren’t an option.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT06179303RecruitingPhase 2
Imaging to predict response to abemaciclib for advanced breast cancer
This trial tests if a special PET scan can predict how well the drug abemaciclib works for people with advanced hormone receptor-positive, HER2-negative breast cancer. If you qualify, you would receive abemaciclib and have imaging scans to see if your cancer responds.
St Louis, MissouriAges 18 years+ - NCT06072781RecruitingPhase 3
Study of Avutometinib + Defactinib for recurrent low-grade ovarian cancer
This trial tests a combination of two oral targeted drugs for people with recurrent low-grade serous ovarian cancer. It aims to see if this therapy works better than standard hormone therapy or chemotherapy options.
Phoenix, ArizonaAges 18 years+ - NCT05467891RecruitingPhase 2
Ribociclib plus hormone therapy for recurrent breast cancer
This trial tests whether adding ribociclib (a targeted pill) to hormone therapy can control breast cancer that has come back in the breast area or nearby lymph nodes/chest wall. It targets hormone-receptor–positive and HER2-negative tumors to help slow disease after local treatment.
Birmingham, AlabamaAges 18 years+ - NCT06953882RecruitingPhase 2
Skipping chemo after surgery for ER+ HER2- breast cancer
This study tests whether some people with a certain type of breast cancer (ER-positive, HER2-negative) can safely skip chemotherapy. After surgery, they receive a targeted pill (ribociclib) plus hormone therapy instead. The goal is to see if this approach works just as well with fewer side effects.
New Haven, ConnecticutAges 18 years+ - NCT06934785Recruiting
Comparing two fertility drugs for ovulation induction
This trial tests if combining two fertility medications (letrozole and clomiphene citrate) works better than using letrozole alone to help women with ovulation problems release an egg. The goal is to find a more effective treatment for women trying to conceive.
Ho Chi Minh City, Ho Chi Minh CityAges 18–40 - NCT07604571RecruitingPhase 1
Testing IEV407 for Advanced Hormone-Sensitive Breast Cancer
This study tests a new drug called IEV407, either alone or combined with existing hormone therapies, in people with advanced breast cancer that is hormone-receptor positive and HER2 negative. The trial aims to find the right dose and see if this combination helps people whose cancer has stopped responding to previous treatments.
Dallas, TexasAges 18–100 - NCT06380751RecruitingPhase 3
New targeted therapy for BRCA/PALB2-mutated HR+ breast cancer
This trial tests a new combination of targeted therapies (saruparib plus camizestrant or hormone therapy) against standard treatments for people with a specific type of advanced breast cancer. It may be a good option if you have a BRCA1, BRCA2, or PALB2 gene mutation and have not yet had treatment for your advanced disease.
Gilbert, ArizonaAges 18 years+ - NCT07288359RecruitingPhase 1/Phase 2
Study of GVV858 for HR+/HER2- breast cancer and other solid tumors
This trial is testing a new drug, GVV858, either alone or with hormone therapy, for people with HR+/HER2- advanced breast cancer or certain other advanced solid tumors. It may be an option if standard treatments are no longer working or available.
Atlanta, GeorgiaAges 18 years+ - NCT06075953RecruitingPhase 2
Testing Active Surveillance for Hormone-Positive DCIS After Surgery
This trial tests whether active surveillance (close monitoring) is a good option for certain patients with hormone-positive DCIS who have positive surgical margins after initial surgery. You would receive no immediate additional treatment—just regular imaging and check-ups.
Berkeley, CaliforniaAges 18 years+ - NCT05307705RecruitingPhase 1
Testing LOXO-783 for PIK3CA-mutated cancers
This trial tests an experimental drug (LOXO-783) for people with advanced breast cancer or other solid tumors that have a specific change in the PIK3CA gene. The goal is to see if the drug can shrink or slow the growth of the cancer.
Scottsdale, ArizonaAges 18 years+ - NCT04469764RecruitingPhase 2
Abemaciclib for certain recurrent ovarian or endometrial cancers
This Phase 2 study tests abemaciclib, a targeted pill treatment, for recurrent ovarian or endometrial cancer that shows specific tumor genetic patterns. It may help slow or control cancer growth in people whose tumor matches the required test results.
Los Angeles, CaliforniaAges Any age - NCT06979596RecruitingPhase 2
A study of MK-5684 for certain solid tumors
This trial tests an investigational drug called MK-5684 for people with specific types of breast, ovarian, or endometrial cancer. It aims to see if this treatment can help shrink or control the cancer when standard treatments have stopped working or are no longer effective.
Anchorage, AlaskaAges 18 years+ - NCT05827081RecruitingPhase 3
Ribociclib plus endocrine therapy for early breast cancer
This trial studies whether adding ribociclib to standard hormone (endocrine) therapy lowers the risk of breast cancer coming back in early-stage, hormone-receptor–positive cancer. It mainly looks at safety and how well the treatment controls cancer after surgery and (sometimes) prior hormone treatment.
Birmingham, AlabamaAges 18–100 - NCT03458221RecruitingPhase 2/Phase 3
Biology-guided test on recurrent ovarian cancer activity
This trial studies whether a targeted treatment, chosen based on tumor biology, can help people with recurrent ovarian cancer. You may be asked to give a tumor biopsy so researchers can analyze specific “signal” activity in your cancer.
Nijmegen, GelderlandAges 18 years+ - NCT04111978RecruitingPhase 3
Maintenance hormone therapy after ovarian cancer responds
This Phase 3 trial tests whether ongoing treatment with an aromatase inhibitor (a hormone-blocking medicine) after initial chemotherapy can help keep epithelial ovarian/fallopian tube/peritoneal cancer from coming back. It is only for certain tumor types that are hormone-receptor positive (ER+).
GrazAges 18 years+ - NCT04486352RecruitingPhase 1/Phase 2
Targeted therapy trial for recurrent or persistent endometrial cancer
This Phase 1/2 study tests targeted drug(s) for endometrial cancer that has come back or never fully went away after prior treatments. You may be eligible if your tumor can be tested for specific biomarkers and your health allows treatment safely.
Duarte, CaliforniaAges 18 years+ - NCT04563507RecruitingPhase 2
Immunotherapy plus hormone therapy for metastatic ER-positive breast cancer
This Phase 2 study tests a combination of immune-based treatments along with hormone (endocrine) therapy to slow or shrink advanced, hormone-receptor positive, HER2-negative breast cancer. You may be a candidate if your cancer has progressed after standard hormone-blocking medicines and you can start treatment with CDK4/6 medicine plus an aromatase inhibitor.
New York, New YorkAges 18–90 - NCT04606446RecruitingPhase 2
Study drug for ER-positive, HER2-negative cancers after treatment
This Phase 2 study tests a new Pfizer medicine (PF-07248144) for certain advanced or metastatic breast, prostate, or lung cancers that have not responded to standard treatment or no standard options exist. You may qualify if you have a specific tumor type and a limited number of prior cancer treatments, and if your body functions (blood, liver, kidneys) and heart rhythm meet safety limits.
Scottsdale, ArizonaAges 18 years+ - NCT04614194RecruitingPhase 2
Blood and tumor markers to test response to abemaciclib
This trial studies how the immune system and other body signals in blood and tumor tissue relate to how well abemaciclib works before breast cancer surgery. The goal is to learn who benefits most from this medicine and why.
Dallas, TexasAges 18 years+ - NCT04886531RecruitingPhase 2
Pre-surgery neratinib plus hormone therapy with trastuzumab
This study tests whether a pre-surgery treatment plan that adds neratinib to hormone therapy and trastuzumab can shrink HER2-positive, ER-positive breast cancer before surgery. It may help patients by improving how much cancer is eliminated at the time of surgery.
Chicago, IllinoisAges 18 years+ - NCT05035836RecruitingPhase 2
Test drug after early HER2-positive breast cancer surgery
This trial tests zanidatamab, a type of targeted antibody treatment, in people with early-stage HER2-positive breast cancer to see how well it works and how safe it is. Because it’s a single-arm pilot study, everyone in the study gets the drug, and you’ll likely be asked to undergo standard surgery if appropriate.
Houston, TexasAges 18 years+
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Common questions
- Are there clinical trials for letrozole?
- Yes. Clin2 currently lists 103 recruiting letrozole studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a letrozole trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a letrozole trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.