Clinical trials
Letrozole clinical trials
Below are recruiting letrozole clinical trials, each written for real people, not researchers. We’re tracking 99 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06507618RecruitingPhase 3
Pre-surgery hormone therapy to guide radiation decisions for breast cancer
This trial tests whether taking hormone therapy for 3 months before breast-conserving surgery can help doctors decide if radiation is right for you. It is for women aged 65 and older with a common type of breast cancer that is hormone receptor-positive and HER2-negative.
New Haven, ConnecticutAges 65 years+ - NCT06492616RecruitingPhase 3
Elacestrant versus standard hormone therapy for early breast cancer
This trial compares a new medicine, elacestrant, to the usual hormone therapy for people with early-stage breast cancer that is hormone receptor-positive and HER2-negative, and who have a high chance of it coming back. The goal is to see if elacestrant works better at preventing the cancer from returning.
Daphne, AlabamaAges 18 years+ - 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+ - NCT06348134RecruitingPhase 2
Anti-HER2 Therapy Before and After Surgery for HER2-Positive Breast Cancer
This trial tests a targeted therapy (anti-HER2) given before and after surgery for Nigerian women with HER2-positive breast cancer. It aims to see if this treatment helps shrink tumors and improve outcomes.
Ikeja, LagosAges 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+ - 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+ - NCT06120283RecruitingPhase 1
Study of BGB-43395 alone or with other drugs for advanced solid tumors
This study tests a new drug called BGB-43395 alone or with other treatments for advanced solid tumors, especially breast cancer. The goal is to find the best dose and see how well it works. It may be an option if your cancer has not responded to other treatments.
Denver, ColoradoAges 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+ - 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+ - NCT05997017RecruitingPhase 2
Nab-sirolimus plus letrozole for advanced endometrial cancer
This trial tests a combination of two drugs—nab-sirolimus and letrozole—for people with advanced or returning endometrioid endometrial cancer. The goal is to see if this combination can shrink tumors or slow cancer growth.
Little Rock, ArkansasAges 18 years+ - NCT05867251RecruitingPhase 1/Phase 2
AVZO-021 for advanced breast and ovarian cancers
This early-stage study tests AVZO-021, a new anti-cancer medicine, in people with advanced solid tumors like specific types of breast and ovarian (or related) cancers. It’s meant to find the safest dose and look for signs the medicine can shrink tumors, especially in cancers with certain gene changes.
New Haven, ConnecticutAges 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 - NCT05768139RecruitingPhase 1/Phase 2
Testing a new targeted drug for advanced solid tumors with PI3Kα mutation
This trial tests tersolisib, a new targeted medicine, in adults with advanced or hard-to-remove solid cancers. It focuses on tumors that have a specific genetic change (PI3Kα mutation) to see how well the treatment works and what side effects it causes.
Los Angeles, CaliforniaAges 18 years+ - NCT05774951RecruitingPhase 3
Camizestrant for hormone-positive, HER2-negative early breast cancer
This trial tests camizestrant, a medicine that blocks estrogen signaling, to help prevent hormone-positive, HER2-negative early breast cancer from coming back. You may be eligible if your cancer has higher- or intermediate-risk features and you already completed at least 2 years of hormone therapy.
Birmingham, AlabamaAges 18–130 - NCT05645536Enrolling by invitationPhase 3
Safety follow-up for hormone-positive, HER2-negative breast cancer
This trial studies the safety of continuing endocrine therapy with ovarian suppression (for women) after you finish the earlier OVELIA study. It may help doctors confirm that the treatment remains safe for longer-term use.
Greenbrae, CaliforniaAges 18–51 - NCT05582499RecruitingPhase 2
Neoadjuvant treatment study for certain breast cancers
This Phase 2 study tests a “precision platform” approach—treatment before surgery—based on specific test results from your breast tumor. It may help determine whether the treatment plan works better for people with particular breast cancer subtypes and healthy organ function.
Shanghai, Shanghai MunicipalityAges 18–70 - NCT05512364RecruitingPhase 3
Elacestrant for ER-positive, HER2-negative breast cancer with ctDNA relapse
This trial tests whether elacestrant can help stop or delay breast cancer coming back in people whose blood test shows “ctDNA relapse” after early breast cancer treatment. It’s meant for hormone receptor–positive, HER2-negative breast cancer patients who are already taking hormone (endocrine) therapy and have no visible spread on scans.
AnderlechtAges 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 - 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+ - NCT05472792RecruitingPhase 2
Testing breast radiation after lumpectomy with or without hormone pills
This Phase 2 trial compares different “after-surgery” treatment plans for certain older women with hormone-sensitive early breast cancer. It looks at whether a standard hormone-pills approach or a faster, smaller-area radiation approach (given after lumpectomy) works best to prevent cancer coming back.
Chapel Hill, North CarolinaAges 65 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+ - 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+ - 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+
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Common questions
- Are there clinical trials for letrozole?
- Yes. Clin2 currently lists 99 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.