A Study of HER3-DXd in Subjects With Locally Advanced or Metastatic Solid Tumors

NCT ID: NCT06172478

Last Updated: 2026-01-28

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

PHASE2

Total Enrollment

740 participants

Study Classification

INTERVENTIONAL

Study Start Date

2024-02-26

Study Completion Date

2028-10-10

Brief Summary

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This is a proof-of-concept study designed to investigate HER3-DXd monotherapy in locally advanced unresectable or metastatic solid tumors. The study is enrolling cohorts of participants with melanoma \[cutaneous/acral\], squamous cell carcinomas of the head and neck (SCCHN), HER2-negative gastric cancer ovarian carcinoma, cervical cancer, endometrial cancer, bladder cancer, esophageal carcinoma, pancreatic carcinoma, prostate cancer, second-line gastric cancer, lung cancer, and breast cancer.

Detailed Description

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This study is designed to assess the safety and efficacy of HER3-DXd monotherapy in subjects with refractory locally advanced unresectable or metastatic solid tumors who have been previously treated with ≥1 prior line of systemic anticancer therapy.

The primary objective of the study is to assess the efficacy of HER3-DXd monotherapy for each type of indicated locally advanced unresectable or metastatic tumor. Secondary objectives include the assessment of safety and tolerability, efficacy, and pharmacokinetics of HER3-DXd monotherapy for each type of indicated locally advanced unresectable or metastatic tumor. HER3 protein expression in tumor tissue and its relationship with HER3-DXd efficacy will also be evaluated.

Conditions

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Advanced Solid Tumor Melanoma Head and Neck Cancer Gastric Cancer Ovarian Carcinoma Cervical Cancer Endometrial Cancer Bladder Cancer Esophageal Cancer Pancreatic Carcinoma Prostate Cancer Non-small Cell Lung Cancer (NSCLC) Lung Cancer Breast Cancer

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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HER3-DXd Monotherapy

Participants with locally advanced unresectable or metastatic cancer (melanoma, head and neck, gastric cancer, ovarian carcinoma, cervical cancer, endometrial cancer, bladder cancer, esophageal carcinoma, pancreatic carcinoma, prostate cancer, second-line gastric cancer, lung cancer, and breast cancer) will receive an intravenous infusion of HER3-DXd monotherapy 5.6 mg/kg every 3 weeks (Q3W).

Group Type EXPERIMENTAL

HER3-DXd

Intervention Type DRUG

Intravenous infusion 5.6 mg/kg administered Q3W on Day 1 of each 21-day cycle

Interventions

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HER3-DXd

Intravenous infusion 5.6 mg/kg administered Q3W on Day 1 of each 21-day cycle

Intervention Type DRUG

Other Intervention Names

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Patritumab Deruxtecan U3-1402

Eligibility Criteria

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Inclusion Criteria

Participants must meet all of the following criteria to be eligible for enrollment into the study:

1. Sign and date the informed consent form prior to the start of any study-specific qualification procedures. A separate tissue screening consent will be obtained from all subjects to meet the baseline tumor tissue requirement.
2. Participants aged ≥18 years (follow local regulatory requirements if the legal age of consent for study participation is \>18 years old).
3. Has locally advanced unresectable or metastatic disease (not curable by surgery or radiation) as follows:

Cutaneous (acral and non-acral) melanoma
1. Histologically or cytologically confirmed cutaneous (acral or non-acral) melanoma
2. Disease progression while on or after having received treatment with ≥1 prior line of anti-programmed cell death protein (PD-1) or anti-programmed death-ligand 1 (PD-L1) based therapy (previous use of other immune checkpoint inhibitors \[ICIs\] \[ie, anti-CTLA4, anti- LAG-3\] is acceptable). Prior anti-PD-(L)1 therapy in the adjuvant setting is allowed if there is recurrence within 12 weeks of the last dose. If the participant had BRAFm melanoma, they must have had disease progression on BRAF/MEK inhibitor therapy as well.

Squamous cell carcinomas of the head and neck
3. Squamous cell carcinoma of the head and neck (with a primary location of oral cavity,oropharynx, larynx, hypopharynx) that is human papillomavirus (HPV) positive or negative (as determined by local standard). Excludes tumor location in the nasopharynx, nasal cavity, paranasal sinuses, and unknown primary locations.
4. Disease progression after having received treatment with ≥1 and \<3 prior lines of systemic therapy in the unresectable recurrent or metastatic setting.

Must have had disease progression on anti-PD-(L)1 (either as monotherapy or in combination with chemotherapy or other therapies). Must also have had disease progression on a platinum-based chemotherapy (PBC) regimen either in the recurrent or metastatic setting or in the locally advanced setting with curative intent.

Gastric or GEJ adenocarcinoma
5. Tumor tissue must be confirmed as negative for HER2 expression (immunohistochemistry \[IHC\] 0/1+ or IHC 2+/in situ hybridization negative) as classified by American Society of Clinical Oncology/College of American Pathologists (ASCO-CAP) guidelines and determined prior to enrollment by assessment in a local laboratory that is Clinical Laboratory Improvement Amendments certified (US sites) or accredited based on specific country regulations.
6. Disease progression after having received treatment with ≥2 prior lines of therapy that include PBC with or without anti-PD-1 therapy.

Ovarian Carcinoma
7. Pathologically documented high-grade serous epithelial ovarian cancer, primary peritoneal cancer, or fallopian tube cancer.
8. Documented disease progression ≥4 weeks after the last dose of PBC and \<6 months of last dose of PBC in the advanced or metastatic setting. Prior use of folate reductase alpha targeting antibody-drug conjugate (ADC) (ie, mirvetuximab soravtansine) is allowed.

Cervical Cancer
9. Pathologically or cytologically documented recurrent or persistent squamous, adenosquamous, or adenocarcinoma of the uterine cervix.
10. Disease progression after having received ≥1 line of systemic therapy in the recurrent or metastatic setting. This may include prior anti-PD-(L)1 treatment and/or tissue factor directed ADC (tisotumab vedotin \[TV\]) per regional standard of care.

Endometrial Cancer
11. Pathologically or cytologically documented endometrial cancer (carcinoma of any histological sub-type or endometrial carcinosarcoma), irrespective of microsatellite instability (MSI) or mismatch repair (MMR) status.
12. Documented disease progression after having received ≥1 prior line of therapy (maximum of 3) PBC containing systemic treatment and an anti-PD(L)-1 therapy-containing regimen (combined or sequential) in the advanced/metastatic setting.

Bladder Cancer
13. Pathologically or cytologically documented locally advanced/unresectable or metastatic urothelial carcinoma of the bladder, renal pelvis, ureter, or urethra. Histological variants are allowed if urothelial histology is predominant. Small cell/neuroendocrine tumors are not allowed even if mixed histology.
14. Relapsed or progressed after treatment with ≥1 prior line of therapy (maximum of 3) that contains anti-PD-(L)1 therapy in the perioperative or metastatic setting. At least 1 line of therapy must also contain one of the following treatment modalities: chemotherapy or enfortumab vedotin. Prior fibroblast growth factor receptor (FGFR)-inhibitor treatment for those who are eligible are allowed.

* Required treatments can be given in combination or sequentially
* Prior cisplatin-based therapy or PD-(L)1 inhibitor therapy given for the treatment of muscle invasive urothelial carcinoma is counted as 1 line of therapy
* The same regimen administered twice in different disease settings will be counted as 1 line of prior therapy
* Participants in the second-line setting who have previously received enfortumab vedotin and pembrolizumab in combination can be enrolled.

Esophageal Carcinoma
15. Pathologically or cytologically documented esophageal squamous cell carcinoma.
16. Must have documented disease progression after having received 2 prior lines of therapy including previous PBC with or without an anti-PD-1 therapy-containing regimen (combined or sequential) in the advanced/metastatic setting.

Pancreatic Carcinoma
17. Pathologically or cytologically documented unresectable or metastatic pancreatic adenocarcinoma.
18. Relapsed or disease progression after having received 1 prior line of systemic therapy in the locally advanced/metastatic setting.

Prostate Cancer
19. Pathologically or cytologically documented unresectable locally advanced or metastatic castration-resistant prostate cancer (CRPC).
20. Adenocarcinoma of the prostate without neuroendocrine differentiation or small cell histology.
21. Surgically or medically castrated, with testosterone levels of \<50 ng/dL.
22. Documented objective progression as determined by radiographic progression for subjects with measurable disease after androgen deprivation.
23. Relapsed or disease progression after having received treatment with ≥1 of the following novel hormonal agents: abiraterone, enzalutamide, apalutamide, or darolutamide.
24. Relapsed or disease progression after having received ≥1 cytotoxic chemotherapy regimen that included a taxane.

Gastric Cancer 2L
25. Must have had gastric or GEJ adenocarcinoma confirmed as negative for HER2 expression (IHC 0/1+ or IHC 2+/in situ hybridization negative) as classified by American Society of Clinical Oncology/College of American Pathologists (ASCO-CAP) guidelines and determined prior to enrollment by assessment in a local laboratory that is Clinical Laboratory Improvement Amendments certified (US sites) or accredited based on specific country regulations.
26. Disease progression after having received treatment with only 1 prior line of systemic anti-cancer therapy that includes 5-FU-based chemotherapy with or without an anti-PD-1 therapy. For subjects whose tumors are claudin (CLDN) 18.2 positive, treatment with 5-FU based chemotherapy with CLDN18.2 directed therapy in the first-line setting is allowed.

Non-small Cell Lung Cancer aa. Histologically or cytologically documented metastatic or locally advanced nonsquamous NSCLC not amenable to curative surgery or radiation bb. Documentation of absence of actionable driver mutation (ie, ALK rearrangement, BRAF V600E mutation, EGFR-activating mutations \[exon 19 deletion or L858R mutation\], EGFR exon 20 insertion mutation, HER2 mutation, KRAS G12C mutation, MET exon 14 skipping mutation, NTRK 1/2/3 gene fusion, RET rearrangement, or ROS1 rearrangement). New testing for these genomic alterations is not required for Screening.

cc. Relapsed or disease progression after receiving only anti-PD-(L)1 and PBC (ie, platinum doublet) administered in combination or sequentially for metastatic disease.

Breast Cancer dd. Pathologically documented breast cancer that is assessed as HER2 negative (IHC2+/ISH-, IHC1+, or IHC0 per ASCO/CAP guidelines), and HR positive (either ER and/or PgR positive \[ER or PgR ≥1%\] per ASCO/CAP guidelines). The HER2 and HR results must be from a tumor sample obtained in the metastatic setting.

ee. Participant must have received one line of chemotherapy for mBC, but not more than one line and must have a clinically or radiologically documented evidence of tumor progression on or after CDK 4/6 inhibitor combined with endocrine therapy; previous treatments with phosphoinositide 3-kinase (PI3K) inhibitors, mammalian target of rapamycin (mTOR) inhibitors, protein kinase B (PKB) inhibitors also known as AKT-inhibitors and poly ADP ribose polymerase (PARP)-inhibitors are allowed.
4. Has ≥1 measurable lesion on CT or MRI as per RECIST v1.1 by investigator assessment. Prostate cancer participants with bone only disease may be eligible.
5. Provides a pretreatment tumor tissue sample that meets 1 of the following collection requirements:

1. Tumor biopsy from ≥1 lesion not previously irradiated and performed since progression with the most recent systemic cancer therapy regimen and prior to signature of the tissue ICF (ARCHIVAL PRETREATMENT sample).

OR
2. Newly obtained pretreatment tumor biopsy from ≥1 lesion not previously irradiated and amenable to sampling, after signature of tissue ICF (FRESH PRETREATMENT sample)
6. Has Eastern Cooperative Oncology Group performance status (ECOG PS) of 0 or 1 at screening.

Exclusion Criteria

Participants who meet any of the following criteria will be disqualified from entering the study:

1. Has HER2-positive gastric cancer as classified by ASCO-CAP guidelines and determined prior to enrollment by assessment in a local laboratory that is Clinical Laboratory Improvement Amendments certified (US sites) or accredited based on specific country regulations.
2. Has nasopharyngeal cancer.
3. Has mucosal or uveal melanoma.
4. Has a history of (non-infectious) interstitial lung disease (ILD), that required corticosteroids, has current ILD/pneumonitis, or suspected ILD/pneumonitis cannot be ruled out by imaging at screening.
5. Has clinically severe respiratory compromise (based on the investigator's assessment) resulting from intercurrent pulmonary illnesses
6. Is receiving chronic systemic corticosteroids dosed at \>10 mg prednisone daily or equivalent anti-inflammatory activity or any form of immunosuppressive therapy prior to Cycle 1 Day 1.

Participants who require use of bronchodilators, inhaled or topical steroids, or local steroid injections may be included in the study.
7. Had prior treatment with an anti-HER3 antibody and/or antibody-drug conjugate (ADC) that consists of an exatecan derivative that is a topoisomerase I inhibitor (eg, trastuzumab deruxtecan).
8. Has history of other active malignancy within 3 years prior to Cycle 1 Day 1, except the following:

1. Adequately treated nonmelanoma skin cancer
2. Adequately treated intraepithelial carcinoma of the cervix
3. Any other curatively treated in situ disease
9. Has any evidence of severe or uncontrolled diseases (eg, active bleeding diatheses, active serious infection) psychiatric illness/social situations, geographical factors, substance abuse, or other factors that, in the investigator's opinion, make it high risk for the subject to participate in the study or that would jeopardize compliance with the protocol
10. Has previously received topoisomerase-1 inhibitors (e.g., irinotecan) treatment in the advanced or metastatic disease setting.
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Merck Sharp & Dohme LLC

INDUSTRY

Sponsor Role collaborator

Daiichi Sankyo

INDUSTRY

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Global Clinical Leader

Role: STUDY_DIRECTOR

Daiichi Sankyo

Locations

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City of Hope

Duarte, California, United States

Site Status RECRUITING

Yale Cancer Center

New Haven, Connecticut, United States

Site Status RECRUITING

AdventHealth Medical Group Oncology Research at Celebration

Kissimmee, Florida, United States

Site Status RECRUITING

University of Illinois Cancer Center

Chicago, Illinois, United States

Site Status RECRUITING

Johns Hopkins University

Baltimore, Maryland, United States

Site Status RECRUITING

Health Partners Frauenshuh Cancer Center

Saint Louis Park, Minnesota, United States

Site Status RECRUITING

Health Partners Cancer Center at Regions Hospital

Saint Paul, Minnesota, United States

Site Status RECRUITING

Washington University, School of Medicine

St Louis, Missouri, United States

Site Status RECRUITING

Roswell Park Cancer Institute IDS

Buffalo, New York, United States

Site Status RECRUITING

Memorial Sloan Kettering Hospital

New York, New York, United States

Site Status RECRUITING

SCRI Oncology Partners

Nashville, Tennessee, United States

Site Status RECRUITING

The University of Texas MD Anderson Cancer Center

Houston, Texas, United States

Site Status RECRUITING

Fred Hutchinson Cancer Center

Seattle, Washington, United States

Site Status RECRUITING

Chris O'Brien Lifehouse

Camperdown, , Australia

Site Status RECRUITING

Icon Cancer Centre Chermside

Chermside, , Australia

Site Status RECRUITING

Monash Medical Centre Clayton

Clayton, , Australia

Site Status RECRUITING

Icon Cancer Centre Hobart

Hobart, , Australia

Site Status RECRUITING

Icon Cancer Centre Townsville

Hyde Park, , Australia

Site Status RECRUITING

Cliniques Universitaires Saint-Luc

Brussels, , Belgium

Site Status RECRUITING

UZA

Edegem, , Belgium

Site Status RECRUITING

Universitair Ziekenhuis Gent

Ghent, , Belgium

Site Status RECRUITING

Universitair Ziekenhuis Brussel

Jette, , Belgium

Site Status RECRUITING

UZ Leuven

Leuven, , Belgium

Site Status RECRUITING

Cross Cancer Institute

Edmonton, Alberta, Canada

Site Status RECRUITING

Sunnybrook Research Institute

Toronto, , Canada

Site Status RECRUITING

Princess Margaret Cancer Centre

Toronto, , Canada

Site Status RECRUITING

BC Cancer - Vancouver

Vancouver, , Canada

Site Status RECRUITING

Sun Yat-sen University Cancer Center

Guangzhou, , China

Site Status RECRUITING

Chu Bordeaux

Bordeaux, , France

Site Status RECRUITING

Centre Georges Franăois Leclerc

Dijon, , France

Site Status RECRUITING

Hopital Claude Huriez - Chu Lille

Lille, , France

Site Status RECRUITING

Centre Léon Bérard

Lyon, , France

Site Status RECRUITING

Hăpital de La Timone

Marseille, , France

Site Status RECRUITING

Chu Nantes - Hătel Dieu

Nantes, , France

Site Status RECRUITING

Institut Claudius Regaud

Toulouse, , France

Site Status RECRUITING

ICL - Alexis Vautrin

Vandœuvre-lès-Nancy, , France

Site Status RECRUITING

Institut Gustave Roussy

Villejuif, , France

Site Status RECRUITING

Krankenhaus Nordwest GmbH

Frankfurt, , Germany

Site Status RECRUITING

Bacs-Kiskun Varmegyei Oktatokorhaz

Kecskemét, , Hungary

Site Status RECRUITING

Humanitas Gavazzeni

Bergamo, , Italy

Site Status RECRUITING

IRCCS Ospedale Policlinico San Martino

Genova, , Italy

Site Status RECRUITING

AOU Federico II - Oncologia Clinica

Napoli, , Italy

Site Status RECRUITING

Centro Ricerche Cliniche di Verona s.r.l.

Verona, , Italy

Site Status RECRUITING

Saitama Medical University International Medical Center

Hidaka, , Japan

Site Status RECRUITING

National Cancer Center Hospital East

Kashiwa-shi, , Japan

Site Status RECRUITING

NHO Shikoku Cancer Center

Matsuyama, , Japan

Site Status RECRUITING

Shizuoka Cancer Center

Nagaizumi-cho, , Japan

Site Status RECRUITING

Aichi Cancer Center Hospital

Nagoya, , Japan

Site Status RECRUITING

Kindai University Hospital

Osakasayama-shi, , Japan

Site Status RECRUITING

National Cancer Center Hospital

Tokyo, , Japan

Site Status RECRUITING

Cancer Institute Hospital of JFCR

Tokyo, , Japan

Site Status RECRUITING

Yokohama City University Medical Center

Yokohama, , Japan

Site Status RECRUITING

Amsterdam UMC locatie Vumc

Amsterdam, , Netherlands

Site Status RECRUITING

Universitair Medisch Centrum Groningen

Groningen, , Netherlands

Site Status RECRUITING

Leids Universitair Medisch Centrum

Leiden, , Netherlands

Site Status RECRUITING

Maastricht University Medical Center

Maastricht, , Netherlands

Site Status RECRUITING

Radboud University Medical Center

Nijmegen, , Netherlands

Site Status RECRUITING

Akershus universitetssykehus

Lørenskog, , Norway

Site Status RECRUITING

Haukeland universitetssjukehus

Lørenskog, , Norway

Site Status RECRUITING

Oslo Universitetssykehus HF, Radiumhospitalet

Oslo, , Norway

Site Status RECRUITING

Cha Bundang Medical Center, Cha University

Seongnam, , South Korea

Site Status RECRUITING

Seoul National University Bundang Hospital

Seongnam, , South Korea

Site Status RECRUITING

Seoul National University Hospital

Seoul, , South Korea

Site Status RECRUITING

Severance Hospital, Yonsei University Health System

Seoul, , South Korea

Site Status RECRUITING

Asan Medical Center

Seoul, , South Korea

Site Status RECRUITING

Samsung Medical Center

Seoul, , South Korea

Site Status RECRUITING

Hospital Universitari Vall D'Hebron

Barcelona, , Spain

Site Status RECRUITING

Hospital Clinic de Barcelona

Barcelona, , Spain

Site Status RECRUITING

Hospital de La Santa Creu I Sant Pau

Barcelona, , Spain

Site Status RECRUITING

Hospital General Universitario Gregorio Marañon

Madrid, , Spain

Site Status RECRUITING

Hospital Universitario Ramon Y Cajal

Madrid, , Spain

Site Status RECRUITING

Hospital Universitario 12 de Octubre

Madrid, , Spain

Site Status RECRUITING

HOSPITAL REGIONAL UNIVERSITARIO de MALAGA AVDA.

Málaga, , Spain

Site Status RECRUITING

Hospital Universitario Virgen Macarena

Seville, , Spain

Site Status RECRUITING

Hospital Clinico Universitario de Valencia

Valencia, , Spain

Site Status RECRUITING

Kaohsiung Chang Gung Memorial Hospital

Kaohsiung City, , Taiwan

Site Status RECRUITING

National Cheng Kung University Hospital

Tainan, , Taiwan

Site Status RECRUITING

National Taiwan University Hospital

Taipei, , Taiwan

Site Status RECRUITING

Taipei Veterans General Hospital

Taipei, , Taiwan

Site Status RECRUITING

Chang Gung Memorial Hospital

Taoyuan District, , Taiwan

Site Status RECRUITING

University Hospital Coventry

Coventry, , United Kingdom

Site Status RECRUITING

Barts Hospital

London, , United Kingdom

Site Status RECRUITING

Royal Free Hospital

London, , United Kingdom

Site Status RECRUITING

Nottingham City Hospital Campus

Nottingham, , United Kingdom

Site Status RECRUITING

Countries

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United States Australia Belgium Canada China France Germany Hungary Italy Japan Netherlands Norway South Korea Spain Taiwan United Kingdom

Central Contacts

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Daiichi Sankyo Contact for Clinical Trial Information

Role: CONTACT

9089926400

Facility Contacts

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Principal Investigator

Role: primary

Principal Investigator

Role: primary

See Central Contact

Role: primary

See Central Contact

Role: primary

See Central Contact

Role: primary

See Central Contact

Role: primary

See Central Contact

Role: primary

References

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Powles T, Bhatia A, Burtness B, Kogawa T, Nishina T, Nakayama I, Fountzilas C, Castillo DR, McKean M, Meric-Bernstam F, Colombo N, Smithy JW, Fayette J, Chandra S, Sternberg DW, Jin F, Sullivan K, Yueh S, Clinthorne G, Aguilo AE, Kudchadkar R, Hayashi H. HERTHENA-PanTumor01: a phase II study of patritumab deruxtecan (HER3-DXd) in previously treated advanced solid tumors. Future Oncol. 2025 Oct;21(25):3283-3292. doi: 10.1080/14796694.2025.2561539. Epub 2025 Oct 14.

Reference Type DERIVED
PMID: 41088723 (View on PubMed)

Other Identifiers

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2023-507641-29-00

Identifier Type: OTHER

Identifier Source: secondary_id

jRCT2031230575

Identifier Type: OTHER

Identifier Source: secondary_id

U31402-277

Identifier Type: -

Identifier Source: org_study_id

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