Treatment
Letrozole clinical trials
We’re tracking 103 recruiting studies that include Letrozole, each written for real people, not researchers, below.
Recruiting studies
- 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+ - 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 - NCT05766410RecruitingPhase 2
Testing three CDK4/6 pills to change the immune response
This phase 2 trial compares ribociclib, palbociclib, and abemaciclib to see how each one affects your body’s immune response in estrogen- and/or progesterone-receptor–positive, HER2-negative early breast cancer. If you fit the stage and health requirements, joining could help doctors learn which treatment best “modulates” the immune system.
TaipeiAges 20 years+ - 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 - 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+ - NCT05891093RecruitingPhase 3
Fluzoparib plus hormone therapy after surgery for breast cancer
This Phase 3 trial tests whether fluzoparib added to standard hormone (endocrine) therapy after early breast cancer surgery can improve outcomes and safety. It may help patients whose tumors are ER-positive, HER2-negative, and a specific SNF3 subtype.
Beijing, Beijing MunicipalityAges 18–70 - NCT05900206RecruitingPhase 2
Trastuzumab deruxtecan vs standard chemotherapy before breast surgery
This Phase 2 study compares trastuzumab deruxtecan to standard chemotherapy given before surgery for HER2-positive breast cancer. It aims to see which treatment works better to shrink the tumor and spread before the operation.
MalmöAges 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+ - NCT06016738RecruitingPhase 3
Palazestrant vs standard therapy for advanced breast cancer
This trial compares a new oral drug, palazestrant (OP-1250), to standard hormone therapies for people with ER+/HER2- advanced breast cancer that has worsened after prior hormone therapy. It tests whether palazestrant can better control the cancer.
Tucson, ArizonaAges 18 years+ - NCT06041204Recruiting
Thyroid hormone plus letrozole for PCOS and mild hypothyroidism
This trial tests whether adding a low-dose thyroid hormone (levothyroxine) to the standard fertility treatment letrozole improves pregnancy rates in women with both PCOS and mild hypothyroidism. It may help if you have trouble getting pregnant and have these two conditions.
CairoAges 20–40 - NCT06120283RecruitingPhase 1
Testing a new drug for breast cancer and other solid tumors
This trial tests a new oral drug (BGB-43395) alone or with other treatments for people with advanced breast cancer or other solid tumors that depend on CDK4. It aims to find safe doses and see if the drug helps shrink tumors or slow growth.
Denver, ColoradoAges 18 years+ - NCT06276868RecruitingPhase 2
Darsilide plus hormone therapy and double antibody for breast cancer
This trial tests if adding a new drug (darsilide) to standard hormone therapy and two antibodies (trastuzumab and pertuzumab) before surgery can improve outcomes for women with HR-positive, HER2-positive breast cancer that hasn't spread.
Henan, HenanAges 18–70 - 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+ - NCT06366347RecruitingPhase 2
Maintenance letrozole and abemaciclib for advanced endometrial cancer
This trial tests whether taking two oral medications (letrozole and abemaciclib) after standard chemotherapy can help keep advanced or recurrent endometrial cancer from coming back. It is for people whose cancer is estrogen receptor-positive and has certain favorable genetic features.
Boston, MassachusettsAges 18 years+ - NCT06492616RecruitingPhase 3
Elacestrant vs standard hormone therapy for high-risk early breast cancer
This trial tests a new hormone therapy pill (elacestrant) against standard hormone therapy for people with a common type of early breast cancer (ER+, HER2-) that has a higher chance of returning. You may qualify if you've already been on hormone therapy for 2 to 5 years and want to see if a different pill works better.
Daphne, AlabamaAges 18 years+ - NCT06793904Recruiting
Comparing two ways to measure insulin resistance in PCOS
This study compares two methods (HOMA1-IR and HOMA2-IR) of measuring insulin resistance to see which one better predicts whether women with PCOS will ovulate after treatment. It aims to find a simple blood test that could help guide fertility treatment.
CairoAges 18–35 - NCT06905301Recruiting
Study on breast cancer medication with a mobile app
This study compares how well breast cancer patients take their medication (ribociclib) with or without using a mobile app. It aims to see if the app helps patients stick to their treatment plan.
Pskov, RussiaAges 18–90 - NCT06974929RecruitingPhase 1/Phase 2
Study of HRS-6209 combinations for breast cancer
This trial tests a new drug called HRS-6209 combined with other treatments for people with breast cancer that has worsened after previous therapy. It aims to find a more effective way to control the cancer.
Tianjin, Tianjin MunicipalityAges 18–75 - NCT07019363RecruitingPhase 3
CDK4/6 inhibitor plus hormone therapy for high-risk breast cancer
This trial tests whether adding a CDK4/6 inhibitor (a type of targeted pill) to standard hormone therapy after surgery can lower the risk of breast cancer coming back in women with high-risk, hormone-receptor-positive, HER2-positive early breast cancer.
ShanghaiAges 18–70 - NCT07024173RecruitingPhase 3
Study of HRS-8080 for advanced breast cancer
This trial tests a new drug, HRS-8080, against other standard treatments chosen by your doctor for advanced or metastatic breast cancer. It's for women who have already tried 1-2 hormone therapies and are in generally good health.
Guangzhou, GuangdongAges 18–75 - NCT07029399RecruitingPhase 1
Study of NKT5097 for advanced solid tumors
This trial tests an experimental oral drug (NKT5097) for people with advanced solid tumors that have not responded to other treatments. It may also be an option for people with a specific type of breast cancer (HR+/HER2-). The goal is to see if the drug is safe and effective.
Duarte, CaliforniaAges 18 years+ - NCT07054190RecruitingPhase 2
Testing Inavolisib in early-stage breast cancer with PIK3CA mutation
This trial is testing a drug called Inavolisib (a type of targeted therapy) given before surgery for people with early-stage, hormone receptor-positive, HER2-negative breast cancer that has a specific genetic change (PIK3CA mutation). The goal is to see if adding Inavolisib to standard endocrine therapy can shrink the tumor more effectively.
Los Angeles, CaliforniaAges 18 years+ - NCT07109947Recruiting
Using Letrozole and Misoprostol for Miscarriage Care
This trial tests whether taking an aromatase inhibitor (letrozole) before misoprostol helps complete a miscarriage more effectively. It may offer a treatment option for people with a missed or early pregnancy loss.
AswānAges 18–45
Common questions
- Are there clinical trials studying Letrozole?
- Yes. Clin2 currently lists 103 recruiting studies that include Letrozole, drawn from the U.S. registry and rewritten for real people so you can see what each is testing and who it's for.
- How do I know if I qualify for a Letrozole trial?
- Each study lists its own eligibility criteria — rules about condition, age, and prior treatments. On every Clin2 trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Is Letrozole an approved treatment?
- A drug being studied in a trial may be investigational (still being tested) or already approved and being studied for a new use. Each study page explains what phase it's in. Clin2 does not provide medical advice — talk with your doctor about whether Letrozole or a specific trial is right for you.
Related treatments
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. A drug appearing here is being studied in a trial and may be investigational. Talk with your doctor about whether a specific treatment or trial is right for you.