Treatment
Letrozole clinical trials
We’re tracking 99 recruiting studies that include Letrozole, each written for real people, not researchers, below.
Recruiting studies
- 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 - NCT07508657RecruitingPhase 4
Progesterone after letrozole for intrauterine insemination
This trial tests whether taking progesterone after a type of fertility treatment called IUI can improve success rates. The study focuses on people who are using a drug called letrozole to stimulate the ovaries.
CopenhagenAges 18–37 - 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 - NCT07425990Recruiting
Comparing natural cycle types for frozen embryo transfer
This study compares two types of natural cycle preparation for frozen embryo transfers to see which leads to more pregnancies. It may be a good fit if you are using your own eggs, have regular cycles, and are planning a frozen embryo transfer.
Novi SadAges 18–40 - NCT07349069RecruitingPhase 3
HRS-8080 vs. standard hormone therapy for early breast cancer
This trial tests a new oral drug (HRS-8080) against standard hormone therapy for women with intermediate- or high-risk early breast cancer who have already completed 2 to 5 years of hormone treatment. It aims to see if the new drug can reduce the risk of cancer coming back.
Nanjing, JiangsuAges 18–75 - NCT07319429RecruitingPhase 2/Phase 3
Fertility-sparing treatment for endometrial cancer based on molecular type
This trial tests a tailored approach to preserve fertility in women with early-stage endometrial cancer, using medications like hormones and immunotherapy based on the tumor's molecular subtype. It aims to avoid hysterectomy and keep the uterus intact.
Shanghai, Shanghai MunicipalityAges 18–45 - 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+ - NCT07190443RecruitingPhase 3
Abemaciclib after local recurrence in HR+ HER2- breast cancer
This trial tests whether adding a targeted drug (abemaciclib) to standard treatment helps prevent breast cancer from coming back again after a local recurrence in women with HR-positive, HER2-negative breast cancer.
Koto-ku, TokyoAges 18 years+ - 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+ - 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 - NCT07054190RecruitingPhase 2
Testing inavolisib for early-stage PIK3CA-mutated breast cancer
This study tests a new drug called inavolisib for people with early-stage breast cancer that has a specific genetic change (PIK3CA mutation). The goal is to see if adding this drug to standard hormone therapy is safe and effective before surgery.
Los Angeles, CaliforniaAges 18 years+ - 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+ - NCT07024173RecruitingPhase 3
HRS-8080 versus doctor's choice for advanced breast cancer
This trial tests a new medicine called HRS-8080 for locally advanced or metastatic breast cancer. It compares HRS-8080 with whatever treatment your doctor would normally choose for you.
Guangzhou, GuangdongAges 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 - NCT06998407RecruitingPhase 1/Phase 2
Study of AVZO-023 for advanced solid tumors
This trial tests a new drug, AVZO-023, alone or with other treatments, for people with advanced solid tumors that have not responded to standard therapy. The goal is to see if it can shrink tumors or slow their growth.
Los Angeles, CaliforniaAges 18 years+ - 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 - 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+ - 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 - NCT06930859Recruiting
Study of Ribociclib for HR+ HER2-negative breast cancer in Russia
This study looks at how well ribociclib works when given with hormone therapy after surgery for certain types of breast cancer. It aims to understand real-world benefits and safety for patients in Russia.
Sochi, Russian FederationAges 18–99 - 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 - NCT06650748Enrolling by invitationPhase 2
A study of hormone therapy with or without a targeted drug for breast cancer
This trial tests if adding a targeted drug (CDK4/6 inhibitor) to hormone therapy works better than hormone therapy alone for women with a certain type of breast cancer (HR+/HER2-). The study measures the activity of tumor cells (Ki-67) to help decide treatment.
BeijingAges 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+ - 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
Common questions
- Are there clinical trials studying Letrozole?
- Yes. Clin2 currently lists 99 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.