Advanced Breast Cancer

85

Review clinical trials related to Advanced Breast Cancer. Use filters to narrow results by trial status, phase, treatment, biological sex and sponsor.

Condition / disease
Location
Status: Recruiting

Decision Support Tool for Patients With Advanced Breast Cancer

The goal of this pilot study is to understand and improve the shared decision-making process between people with advanced breast cancer and their providers regarding their care and treatment. As part of this study, the researchers will evaluate a decision support tool called COAST that was designed to support patients and providers in having meaningful conversations. The main questions it aims to answer are: 1. Can the COAST tool improve the quality of communication between patients and their oncology providers? 2. Is the COAST tool acceptable, appropriate, and easy to use at NYP-Weill Cornell Medicine, NYP-Brooklyn Methodist Hospital and NYP-Queens? Participants will be asked to fill out two surveys: one before they use the COAST tool and another about 2 - 4 weeks later. Some patients will also be invited for an interview.

Participants needed: 100
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: Weill Medical College of Cornell UniversityUpdated: Aug 19, 2026Locations: 3
Eligibility criteria

Male or female 18 years and older [+2]

Early breast cancer [+1]

Status: Recruiting

Elacestrant + Everolimus in Patients ER+/HER2-, ESR1mut, Advanced Breast Cancer Progressing to ET and CDK4/6i.

This trial will study a type of advanced breast cancer (ABC) defined as endocrine receptor (ER)-positive/human epidermal growth factor receptor 2(HER2)-negative and estrogen receptor 1 (ESR1)-mutated. Patients will be treated with elacestrant, a compound that acts as a selective estrogen receptor degrader, and everolimus (or placebo), a kinase inhibitor indicated for the treatment of postmenopausal women with advanced hormone receptor-positive, HER2-negative breast cancer. The main purpose of the study is to analyze the efficacy (to find out how effective a treatment is) of elacestrant plus everolimus therapy in patients who have ER-positive/HER2-negative, ESR1-mutated, ABC progressing to endocrine therapy and cyclin-dependent kinase 4/6 (CDK4/6) inhibitor. The efficacy of elacestrant plus everolimus combination will be determined by assessing the period from elacestrant plus everolimus (or placebo) treatment initiation until to the first occurrence of disease progression, unacceptable toxicity, death, or discontinuation from the study treatment for any other reason, whichever occurs first, defined as progression free survival. Rigorous eligibility criteria based on specific co-morbidities and clinicopathologic features of their disease have been designed to minimize the risk of patients participating in this study. The anticipated favorable clinical benefits of elacestrant combined with everolimus are projected to outweigh the risks of this treatment. This study will be performed in full compliance with International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) and all applicable local Good Clinical Practice (GCP) and regulations.

Participants needed: 300
Trial details
Phase: Phase 3Age: 18+Biological sex: AllType: InterventionalSponsor: MedSIRUpdated: Aug 20, 2026Locations: 104
Eligibility criteria

Patient must be capable to understand the purpose of the study and have signed w... [+19]

Resolution of all acute toxic effects of prior anti-cancer therapy to grade ≤ 1... [+28]

Status: Recruiting

BGB-43395 Alone or as Part of Combination Therapies in Participants With Breast Cancer and Other Advanced Solid Tumors

This is a dose escalation and dose expansion study to compare how well BGB-43395, a selective cyclin-dependent kinase 4 (CDK4) inhibitor, works as monotherapy or in combination with fulvestrant, letrozole, or elacestrant in participants with hormone receptor positive (HR+) and human epidermal growth factor 2 negative (HER2-) breast cancer (BC) and other advanced solid tumors. The main purpose of this study is to explore the recommended dosing for BGB-43395.

Participants needed: 399
Trial details
Phase: Phase 1Age: 18+Biological sex: AllType: InterventionalSponsor: BeOne MedicinesUpdated: Aug 19, 2026Locations: 62
Eligibility criteria

Phase 1a (Dose Escalation): Participants with histologically or cytologically co... [+6]

Known leptomeningeal disease or uncontrolled, untreated brain metastases. [+6]

Status: Recruiting

Capecitabine and Cyclophosphamide (XC) as Maintenance Therapy for Advanced Breast Cancer

To compare the efficacy and safety of capecitabine and cyclophosphamide (XC) versus physician's choice as maintenance therapy for patients with advanced breast cancer who achieved disease control after salvage treatment.

Participants needed: 86
Trial details
Age: 18+Biological sex: FemaleType: InterventionalSponsor: Wenjin YinUpdated: Aug 19, 2026Locations: 1
Eligibility criteria

Female, age≥18 years old [+7]

during pregnancy and lactation [+1]

Status: Recruiting

Metarrestin (ML-246) in Subjects With Metastatic Solid Tumors

Background: Metastasis is the spread of cancer from one organ to a nonadjacent organ. It causes 90% of cancer deaths. No treatment specifically prevents or reduces metastasis. Researchers hope a new drug can help. It stops cancer cells from growing and spreading further and possibly shrink cancer lesions in distant organs. Objective: To find a safe dose of metarrestin and to see if this dose shrinks tumors. Eligibility: Adults age 18 and older with pancreatic cancer, breast cancer, or a solid tumor that has not been cured by standard therapies. Also, children age 12-17 with a solid tumor (other than a muscle tumor) with no standard therapy options. Design: Participants will be screened with: * blood tests * physical exam * documentation of disease confirmation or tumor biopsy * electrocardiogram to evaluate the heart * review of their medicines and their ability to do their normal activities Participants will take metarrestin by mouth until they cannot tolerate it or stop to benefit from it. They will keep a medicine diary. Participants will visit the Clinical Center. During the first month there are two brief hospital stays required with visits weekly or every other week thereafter. They will repeat some of the screening tests. They will fill out questionnaires. They will have tests of their cognitive function. They will have an electroencephalogram to record brain activity. They will have a computed tomography (CT) scan or magnetic resonance imaging (MRI). A CT is a series of X-rays of the body. An MRI uses magnets and radio waves to take pictures of the body. Adult participants may have tumor biopsies. Participants will have a follow-up visit 30 days after treatment ends. Then they will have follow-up phone calls or emails every 6 months for the rest of their life or until the study ends.

Participants needed: 116
Trial details
Phase: Phase 1Age: 12-120Biological sex: AllType: InterventionalSponsor: National Cancer Institute (NCI)Updated: Aug 18, 2026Locations: 2
Eligibility criteria

histologically or cytologically confirmed solid tumors (Phase IA). [+20]

minor surgical procedure (such as biliary stenting) within 14 days. Note: if liv... [+22]

Status: Not yet recruiting

Trastuzumab Rezetecan Followed by Pyrotinib, and Trastuzumab Combined With Capecitabine as First-line Treatment for Advanced HER2-positive Breast Cancer

This study is a single-arm, exploratory clinical trial, aiming to include patients with HER2-positive advanced breast cancer. It intends to explore the efficacy and safety of trastuzumab combined with pyrotinib, capecitabine ± endocrine therapy as a first-line maintenance treatment for HER2+ advanced breast cancer after induction therapy with rucaparib trastuzumab. After the subjects meet the screening criteria and are enrolled, they receive induction therapy with rucaparib trastuzumab. Among them, patients without disease progression enter the maintenance treatment period and receive trastuzumab combined with pyrotinib, capecitabine ± endocrine therapy (±OFS) for treatment. Until disease progression, or toxicity becomes intolerable, or withdrawal of informed consent, or the investigator determines that the medication must be discontinued. During the study period, imaging evaluations are conducted according to the RECIST 1.1 standard, and the center assessment results are the final results. During the study period, the efficacy indicators such as PFS, ORR, DOR, CBR, and safety indicators of the subjects are evaluated according to the established trial standards, and statistical descriptions are conducted.

Participants needed: 50
Trial details
Phase: Phase 2Age: 18-75Biological sex: FemaleType: InterventionalSponsor: Fujian Cancer HospitalUpdated: Aug 14, 2026Locations: 1
Eligibility criteria

Female participants aged 18 to 75 years (inclusive) [+7]

Patients with active central nervous system metastases who have not undergone su... [+13]

Status: Recruiting

Sequencing Antibody Drug Conjugates in ER+/HER2 LOW/ULTRA LOW MBC

The purpose of this research study is to see if the medication sacituzumab govitecan (SG) is effective at the currently approved dose and schedule in people who have previously received trastuzumab deruxtecan (T-DXd) for the treatment of metastatic, hormone receptor positive (HR+)/human epidermal growth factor 2 low (HER2 low) breast cancer. Although SG is approved to treat metastatic HR+/HER2 negative breast cancer, the aim of this study is to determine if SG is still effective specifically in people who have already received T-DXd.

Participants needed: 75
Trial details
Phase: Phase 2Age: 18+Biological sex: AllType: InterventionalSponsor: Reshma L. Mahtani, D.O.Updated: Aug 12, 2026Locations: 3
Eligibility criteria

Provision of signed and dated informed consent form. [+33]

Locally advanced MBC (stage IIIc) in individuals who are candidates for curative... [+7]

Status: Recruiting

Metronomic Oral Paclitaxel Monotherapy for Advanced HER2-Negative Breast Cancer: A Two-Stage Dose-Finding and Expansion Study

The goal of this clinical trial is to evaluate the safety, tolerability, and preliminary anti-tumor activity of metronomic oral paclitaxel solution in patients with advanced HER2-negative breast cancer who have previously received systemic anti-cancer treatments. The main questions this study aims to answer are: What doses of metronomic oral paclitaxel solution can be safely administered to patients with advanced HER2-negative breast cancer? How well does metronomic oral paclitaxel solution control tumor growth? What side effects and treatment-related medical problems occur during treatment? This study will include two stages. In the first stage, researchers will evaluate different dosing schedules of oral paclitaxel solution to identify a dose(OTD) with an acceptable balance between safety and potential anti-tumor activity. In the second stage, additional participants will receive the selected dose(OTD) to further evaluate its effectiveness and safety. Participants will: Receive metronomic oral paclitaxel solution according to the assigned dose schedule. Visit the study clinic regularly for physical examinations, laboratory tests, tumor imaging assessments, and safety evaluations. Complete assessments of treatment response, side effects, and quality of life during the study. Continue follow-up after treatment to collect information about disease status and survival.

Participants needed: 73
Trial details
Phase: Phase 2Age: 18+Biological sex: AllType: InterventionalSponsor: Zhejiang Cancer HospitalUpdated: Aug 11, 2026Locations: 1
Eligibility criteria

Line of therapy is defined as a systemic treatment regimen for recurrent or meta... [+12]

Patients with suspected major infectious diseases, neurological disorders, or in... [+17]

Status: Recruiting

Study to Evaluate the Safety and Tolerability of Camizestrant in Combination With Atirmociclib in Women With Advanced Breast Cancer

A study to investigate camizestrant in combination with atirmociclib in participants with estrogen receptor (ER)-positive, human epidermal growth factor receptor 2 (HER2)-negative advanced breast cancer previously treated with a cyclin dependent kinase 4/6 (CDK4/6) inhibitor.

Participants needed: 24
Trial details
Phase: Phase 2Age: 18+Biological sex: FemaleType: InterventionalSponsor: AstraZenecaUpdated: Aug 7, 2026Locations: 6
Eligibility criteria

Participants with advanced adenocarcinoma of the breast and must have received p... [+9]

A participant who has received 2 or more lines of CDK4/6 inhibitors in the advan... [+8]

Status: Recruiting

A First-in-Human Study of MEN2312 in Adults With Advanced Breast Cancer

This is a first-in-human study of MEN2312, a lysine acetyltransferase 6 (KAT6) inhibitor, in adult participants with advanced breast cancer.

Participants needed: 240
Trial details
Phase: Phase 1Age: 18+Biological sex: AllType: InterventionalSponsor: Stemline Therapeutics, Inc.Updated: Aug 7, 2026Locations: 45
Eligibility criteria

Participant has advanced (locoregionally recurrent or metastatic) breast cancer... [+3]

Active or newly diagnosed central nervous system metastases. [+2]

Status: Recruiting

Phase III Study to Evaluate the Safety, Efficacy, and Impact on Quality of Life of Capivasertib Alongside Standard-of-care Endocrine Treatment in Patients With HR+/HER2- Advanced Breast Cancer and Progression on Prior Endocrine-based Treatment

This is a multicentre phase-III-trial to evaluate the use of capivasertib in patients with HR+/HER2- advanced breast cancer and progression on prior endocrine-based treatment. The goal of this study is 1. To evaluate benefit of capivasertib regarding time to next treatment (TTNT1) - i.e., time "on treatment" with capivasertib. 2. To evaluate the benefits of patient reported outcome(PRO)-adherence regarding the deterioration of quality of life (DQoL)-free interval. There is no active comparison group but a historical control group consisting of data of patients treated within the CAPItello-291-study.. Participants will take capivasertib accompanied by standard of care endocrine treatment and are asked to document ther quality of life on standardised questionnaires. Optionally, patients can use eHealth support via their own smart phones.

Participants needed: 250
Trial details
Phase: Phase 3Age: 18+Biological sex: AllType: InterventionalSponsor: Women's Cancer Study Group GmbHUpdated: Aug 5, 2026Locations: 16
Eligibility criteria

Females (≥18 years, pre-, peri- or post-menopausal) and males (≥18 years) at the... [+16]

Absence of an alteration in the PIK3CA/AKT1/PTEN biomarkers [+37]

Status: Recruiting

A Trial to Evaluate Ovarian Suppression Following Subcutaneous ZOLADEX 10.8 mg in Premenopausal Women With HR+, HER2- Advanced Breast Cancer

The primary objective of this trial is to evaluate ovarian suppression following treatment with ZOLADEX 10.8 mg by luteinizing hormone (LH).

Participants needed: 88
Trial details
Phase: Phase 1Age: 18-55Biological sex: FemaleType: InterventionalSponsor: TerSera Therapeutics LLCUpdated: Aug 4, 2026Locations: 20
Eligibility criteria

Gonadotropin-releasing Hormone (GnRH) treatment-naïve: Female participants aged... [+16]

Postmenopausal: Naturally or surgically postmenopausal (regardless of age). [+28]

Status: Recruiting

Phase 3 Study of RLY-2608 + Fulvestrant vs Capivasertib + Fulvestrant as Treatment for Locally Advanced or Metastatic PIK3CA-mutant HR+/HER2- Breast Cancer

This is a global, multicenter, open-label, randomized Phase 3 study comparing the efficacy and safety of RLY-2608 (zovegalisib) + fulvestrant to capivasertib + fulvestrant for the treatment of patients with HR+/HER2- ABC with PIK3CA mutation following recurrence or progression on or after treatment with a CDK4/6 inhibitor.

Participants needed: 540
Trial details
Phase: Phase 3Age: 18+Biological sex: AllType: InterventionalSponsor: Relay Therapeutics, Inc.Updated: Aug 5, 2026Locations: 222
Eligibility criteria

Patient has ECOG performance status of 0-1 [+8]

CDK2 inhibitors. Prior treatment with other investigational CDK inhibitors could... [+10]

Status: Recruiting

Safety and Efficacy of T-DXd vs. CDK4/6i-based ET as First-line Therapy of HR-positive and HER2-low/Ultralow Advanced Breast Cancer Patients Classified as Non-luminal Subtype

This trial studies a type of advanced breast cancer defined as hormone receptor HR-positive/HER2-negative and classified as non-luminal by gene expression profiling (PAM50). Patients will be treated with trastuzumab deruxtecan (T-DXd) or with physician's choice of CDK4/6 inhibitor (CDK4/6i) plus endocrine therapy (ET). The main purpose of the study is to analyze the efficacy of T-DXd in patients who have HR-positive and HER2-low/ultralow advanced breast cancer classified as non-luminal subtype.

Participants needed: 200
Trial details
Phase: Phase 2Age: 18+Biological sex: AllType: InterventionalSponsor: MedSIRUpdated: Jul 30, 2026Locations: 79
Eligibility criteria

Patients must be capable to understand the purpose of the study and have signed... [+22]

Current participation in another therapeutic clinical trial, except other transl... [+30]

Status: Recruiting

Saruparib (AZD5305) Plus Camizestrant or Plus Endocrine Therapy, Compared With CDK4/6 Inhibitor Plus Endocrine Therapy or Plus Camizestrant in HR-Positive, HER2-Negative (IHC 0, 1+, 2+/ ISH Non-amplified), BRCA1, BRCA2, or PALB2m Advanced Breast Cancer

The primary objective of the study is to measure efficacy of saruparib (AZD5305) plus camizestrant compared with physician's choice CDK4/6i plus ET in patients with BRCA1, BRCA2, or PALB2m, HR-positive, HER2-negative (defined as IHC 0, 1+, 2+/ ISH non-amplified) advanced breast cancer

Participants needed: 788
Trial details
Phase: Phase 3Age: 18+Biological sex: AllType: InterventionalSponsor: AstraZenecaUpdated: Jul 30, 2026Locations: 302
Eligibility criteria

Adult females, pre/peri-menopausal and/or post-menopausal, and adult males [+6]

Participants with history of MDS/AML or with features suggestive of MDS/AML [+26]

Status: Not yet recruiting

T-DXd Based Therapy Followed by Endocrine Therapy Plus Dual HER2 Blockade in First-line HER2+/ HR+ Metastatic Breast Cancer and Retreatment With T-DXd

This study will evaluate a structured sequential treatment strategy starting with T-DXd + pertuzumab upfront therapy, followed by an optimized maintenance therapy with dual HER2+blockade + CDK4/6i + ET and the opportunity to retreat with T-DXd once patients progress under maintenance aimed to maximizing disease control, optimizing tolerability, and preserving T-DXd as a future therapeutic option, while ensuring participant safety and regulatory compliance in participants with HER2+/HR+ advanced/metastatic breast cancer.

Participants needed: 200
Trial details
Phase: Phase 3Age: 18+Biological sex: AllType: InterventionalSponsor: Daiichi SankyoUpdated: Jul 23, 2026
Eligibility criteria

Sign and date the Main Trial informed consent form (ICF), prior to the start of... [+15]

Has prior therapy with any CDK inhibitor. [+9]

Status: Recruiting

A Phase II Study of AK146D1 Combined With AK112 in Advanced Breast Cancer

This is a Phase II clinical study aimed at evaluating the safety, tolerability, antitumor efficacy, PK and immunogenicity of AK146D1 combined with AK112 in advanced breast cancer.

Participants needed: 200
Trial details
Phase: Phase 2Age: 18-75Biological sex: AllType: InterventionalSponsor: AkesoUpdated: Jul 22, 2026Locations: 1
Eligibility criteria

Be able to understand and voluntarily sign the written informed consent form. [+7]

Patients had breast cancer amenable to curative treatment at study enrollment. [+15]

Status: Recruiting

Study of RGT-490 in Patients With PIK3CA-Mutated Advanced Solid Tumors

This is a phase 1/1b, open-label, multicenter study consisting of sequential parts designed to evaluate the safety, tolerability, and effects pharmacokinetic (PK) profile, and antitumor activity of RGT-490, an investigational oral therapy, in adults with locally advanced or metastatic solid tumors including breast cancer. Participants enrolled in the study have advanced disease that is not amendable to curative treatment and whose tumors harbor alterations in the PI3KCA gene.

Participants needed: 63
Trial details
Phase: Phase 1Age: 18+Biological sex: AllType: InterventionalSponsor: Regor Pharmaceuticals Inc.Updated: Jul 22, 2026Locations: 5
Eligibility criteria

Adults with metastatic or locally advanced, unresectable solid tumors that have... [+4]

Diabetes mellitus requiring anti-hyperglycemic medication. [+5]

Status: Recruiting

A Study to Learn About the Study Medicine Called PF-08032562 in People With Advanced or Metastatic Solid Tumors

The purpose of this study is to learn about the safety and effects of the study medicine when given alone or together with other anti-cancer therapies. Anti-cancer therapy is a type of treatment to stop the growth of cancer. This study also aims to find the best amount of study medication. This study is seeking participants that have advanced or metastatic breast cancer (BC), or advanced or metastatic colorectal cancer (CRC). All participants in this study will take the study medication (PF-08032562) as pill by mouth. This will be repeated for 28-day cycles. Depending on which part of the study participants are enrolled into, they will receive the study medication PF-08032562 alone or in combination with other anti-cancer medications. The study medication (PF-08032562) will be taken by mouth (PO) in combination with other anti-cancer medications given in the study clinic by intramuscular (IM) injection into the muscle or intravenous (IV) infusion that is directly injected into the veins at different times (depending on the treatment) during the 28-day cycle. The study may also test different schedules.

Participants needed: 260
Trial details
Phase: Phase 1Age: 18+Biological sex: AllType: InterventionalSponsor: PfizerUpdated: Jul 22, 2026Locations: 13
Eligibility criteria

18 years of age or older [+3]

Active malignancy within 3 years prior to enrollment [+10]

Status: Recruiting

Timing of ctDNA Testing in Advanced Breast Cancer

This multicenter, prospective observational cohort study aims to investigate the impact of circulating tumor DNA (ctDNA) level and key actionable gene mutation status on prognosis and treatment response in patients with advanced breast cancer.

Participants needed: 400
Trial details
Age: 18+Biological sex: AllType: ObservationalSponsor: Geneplus-Beijing Co. Ltd.Updated: Jul 22, 2026Locations: 1
Eligibility criteria

Histologically confirmed advanced breast cancer [+3]

The subject has not signed the informed consent form. [+2]

Status: Recruiting

Study of ADCs Combined With Adebrelimab in HER2-negative Advanced Breast Cancer

Our study is aimed to evaluate the efficacy and safety of novel ADCs named SHR-A1811, SHR-A1921 and SHR-A2102 combined with adebrelimab in HER2-negative advanced breast cancer.

Participants needed: 113
Trial details
Phase: Phase 2Age: 18-75Biological sex: AllType: InterventionalSponsor: Beijing GoBroad HospitalUpdated: Jul 14, 2026Locations: 1
Eligibility criteria

18 years to 75 years old (including boundary values); [+10]

Has known active brain metastasis which needs local therapy immediately; [+16]

Status: Recruiting

Real-world Study of Pyrotinib-containing Regimens of Advanced HER2-positive Breast Cancer

Given that pyrotinib has been proven to exert significant efficacy against HER2-positive advanced breast cancer in multiple Phase III studies, and the novel ADC drug disitamab vedotin has demonstrated potent anti-tumor activity, there remains insufficient real-world data on their sequential administration. This multicenter, prospective real-world study plans to enroll 500 patients with HER2-positive advanced breast cancer receiving first-line or second-line treatment. It aims to evaluate the efficacy and safety of sequential disitamab vedotin treatment after disease progression or intolerance to pyrotinib-based regimens (first-line: pyrotinib plus trastuzumab combined with chemotherapy; second-line: pyrotinib plus capecitabine). The primary endpoint is real-world second progression-free survival (rwPFS2), while secondary endpoints cover real-world progression-free survival (rwPFS), tumor response, overall survival (OS), time to treatment failure, safety profiles and patient-reported outcomes. It is currently expected to further validate the efficacy and safety of pyrotinib in patients with advanced HER2-positive breast cancer in the real-world setting, and to evaluate the efficacy and safety of recindopril trastuzumab following pyrotinib-containing regimens.

Participants needed: 500
Trial details
Phase: Phase 4Age: 18+Biological sex: AllType: InterventionalSponsor: Peking University People's HospitalUpdated: Jul 13, 2026Locations: 1
Eligibility criteria

Aged ≥ 18 years old; [+3]

Failure to sign the informed consent form; [+3]

Status: Recruiting

A Phase 1 Study of BMS-986500 as Monotherapy or Combination Therapy in Advanced Solid Tumors

The purpose of this study is to assess BMS-986500 as monotherapy in advanced solid tumors and as combination therapy in CDK4/6 inhibitor pre-treated advanced breast cancer.

Participants needed: 234
Trial details
Phase: Phase 1Age: 18+Biological sex: AllType: InterventionalSponsor: Bristol-Myers SquibbUpdated: Jul 10, 2026Locations: 21
Eligibility criteria

Participants must be ≥ 18 years of age. [+4]

Participants must not have an active brain metastasis. [+4]

Status: Not yet recruiting

SHIELD: Surveillance of HR+/HER2- : Implementing ESR1m Long-term Monitoring and Detection in 1L aBC

This is a multicountry, multicenter, observational study in patients with hormone receptor-positive, human epidermal growth factor receptor 2-negative advanced breast cancer receiving first-line endocrine-based therapy with an aromatase inhibitor in combination with a CDK4/6 inhibitor. The study aims to describe the prevalence of ESR1 mutations at baseline and the emergence of ESR1 mutations over time using circulating tumor DNA testing in routine clinical practice. Patients receiving first-line treatment for at least 6 months and no more than 18 months, without evidence of disease progression at study entry, may undergo baseline ESR1 mutation testing. Patients with a negative baseline result may undergo longitudinal monitoring approximately every 3 months, for up to 18 months or 6 testing timepoints, to assess emergence of ESR1 mutations. The study will also describe mutation subtypes, testing methods used in routine practice, selected clinical characteristics, and treatment patterns across participating countries.

Participants needed: 3,000
Trial details
Age: 18-130Biological sex: AllType: ObservationalSponsor: AstraZenecaUpdated: Jul 14, 2026
Eligibility criteria

Age 18 years or older at the time of informed consent and willing and able to pr... [+3]

Evidence of disease progression during first-line aromatase inhibitor plus CDK4/... [+1]

Status: Not yet recruiting

Trastuzumab Deruxtecan and Lovastatin in HER2-low and Ultralow Advanced or Metastatic Breast Cancer

The purpose of this study is to evaluate use of lovastatin, a drug that may lower CAV-1 levels, in order to increase HER2 expression on cells and enhance the uptake and efficacy of trastuzumab deruxtecan (T-DXd) in HER2-low and ultralow advanced metastatic breast cancer. Trastuzumab deruxtecan (T-DXd) is an FDA approved antibody drug conjugate for HER2-low and ultralow breast cancer and lovastatin is a cholesterol lowering agent.

Participants needed: 60
Trial details
Phase: Phase 2Age: 18+Biological sex: AllType: InterventionalSponsor: Washington University School of MedicineUpdated: Jul 8, 2026Locations: 1
Eligibility criteria

Histologically or cytologically confirmed HER2 low (IHC 1+ or 2+ with negative i... [+14]

Prior treatment with T-DXd or other topoisomerase I ADC including sacituzumab go... [+17]