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A Phase 3, Multicenter, 2-Arm Randomized, Open-Label Study of Trastuzumab Deruxtecan in Subjects With HER2-Positive Metastatic and/or Unresectable Gastric or Gastro-Esophageal Junction (GEJ) Adenocarcinoma Subjects Who Have Progressed on or After a Trastuzumab-Containing Regimen (DESTINYGastric04)

Trastuzumab Deruxtecan for Subjects with HER2-Positive Gastric Cancer or Gastro-Esophageal Junction Adenocarcinoma after Progression on or After a Trastuzumab-Containing Regimen

Inoguchi Akihiro

DAIICHI SANKYO Co.,Ltd.

1-2-58, Hiromachi, Shinagawa-ku, Tokyo

dsclinicaltrial@daiichisankyo.co.jp

Contact for Clinical Trial Information

DAIICHI SANKYO Co.,Ltd.

1-2-58, Hiromachi, Shinagawa-ku, Tokyo

+81-3-6225-1111

dsclinicaltrial@daiichisankyo.co.jp

Recruiting

Mar. 12, 2021

Interventional

randomized controlled trial

open(masking not used)

active control

parallel assignment

treatment purpose

- Adults (according to local regulation) and able to provide informed consent for study participation.
- Pathologically documented gastric and GEJ adenocarcinoma that has been previously treated in the metastatic setting (unresectable, locally advanced, or metastatic disease).
- Progression on or after first-line therapy with a trastuzumab or approved trastuzumab biosimilar-containing regimen. Note: Prior adjuvant therapy with a trastuzumab-containing regimen can be counted as a line of therapy if the subject progressed on or within 6 months of completing adjuvant therapy.
- Locally or centrally confirmed HER2-positive (IHC 3+ or IHC 2+ and evidence of HER2 amplification by ISH) as classified by ASCO-CAP on a tumor biopsy obtained after progression on or after a first-line trastuzumab or approved trastuzumab biosimilar-containing regimen.
- Eastern Cooperative Oncology Group performance status of 0 or 1 at both Screening and within 3 days prior to randomization.
- Adequate bone marrow, renal, and hepatic function within 14 days of randomization.

- Use of anticancer therapy after trastuzumab-containing treatment
- Medical history of myocardial infarction (MI) within 6 months before randomization/enrollment, symptomatic congestive heart failure (New York Heart Association Class II to IV).
- Has a QT interval corrected by Fridericia's formula (QTcF) prolongation to >470 msec (female subjects) or >450 msec (male subjects) based on average of the Screening triplicate12-lead ECG.
- Has a pleural effusion, ascites, or pericardial effusion that requires drainage, peritoneal shunt, or cell-free and concentrated ascites reinfusion therapy (CART). Drainage and CART must be at least 2 weeks prior to Screening.
- Has a history of (non-infectious) interstitial lung disease (ILD/pneumonitis) that required steroids, has current ILD/pneumonitis, or where suspected ILD/pneumonitis cannot be ruled out by imaging at Screening.
- Any autoimmune, connective tissue or inflammatory disorders (eg, rheumatoid arthritis, Sjogren syndrome, sarcoidosis, etc.) where there is documented (or a suspicion of) pulmonary involvement at the time of Screening.
- Prior pneumonectomy.
- Spinal cord compression or clinically active central nervous system metastases, defined as untreated and symptomatic or requiring therapy with corticosteroids or anticonvulsants to control associated symptoms.
- Has multiple primary malignancies within 3 years, except adequately resected non-melanoma skin cancer, curatively treated in-situ disease, other solid tumors curatively treated.
- History of severe hypersensitivity reactions to either the T-DXd or inactive ingredients in T-DXd.
- History of severe hypersensitivity reactions to other monoclonal antibodies or any components used in the ramucirumab drug product preparation
- Known allergy or hypersensitivity to paclitaxel or any components used in the paclitaxel preparation or other contraindication for taxane therapy such as peripheral neuropathy, Grade 2.
- Current uncontrolled infection requiring antibiotics, antivirals, or antifungals or an unexplained fever >38.0 C during Screening visits or on the first scheduled day of dosing (at the discretion of the Investigator, participants with tumor fever may be enrolled), which in the Investigator's opinion might compromise the participant's participation in the study or affect the study outcome
- Clinically significant gastrointestinal disorder (eg, including hepatic disorders, bleeding, inflammation, occlusion, ileus, diarrhea Grade >1, jaundice, intestinal paralysis, malabsorption syndrome, ulcerative colitis, inflammatory bowel disease, or partial bowel obstruction) in the opinion of Investigator
- Has history of receiving live, attenuated vaccine (mRNA and replication deficient adenoviral vaccines are not considered attenuated live vaccines) within 30 days prior to the first exposure to study intervention.

Both

Gastric Cancer, Adenocarcinoma, Gastroesophageal Junction Adenocarcinoma

- Experimental: Trastuzumab deruxtecan
Participants who will be randomized to receive a 6.4 mg/kg intravenous (IV) dose of trastuzumab deruxtecan once every 3 weeks on Day 1 of each 21-day cycle.

- Active Comparator: Ramucirumab + paclitaxel
Participants who will be randomized to receive a 8 mg/kg IV dose of ramucirumab on Days 1 and 15 in combination with 80 mg/m^2 IV dose of paclitaxel on Days 1, 8, and 15 of a 28-day cycle.

Overall Survival in Participants Who Were Administered Trastuzumab Deruxtecan Compared With Ramucirumab in Combination With Paclitaxel

- Progression-free Survival in Participants Who Were Administered Trastuzumab Deruxtecan Compared With Ramucirumab in Combination With Paclitaxel
- Objective Response Rate in Participants Who Were Administered Trastuzumab Deruxtecan Compared With Ramucirumab in Combination With Paclitaxel
- Duration of Response in Participants Who Were Administered Trastuzumab Deruxtecan Compared With Ramucirumab in Combination With Paclitaxel
- Disease Control Rate in Participants Who Were Administered Trastuzumab Deruxtecan Compared With Ramucirumab in Combination With Paclitaxel
- Incidence of Treatment-emergent Adverse Events (TEAE), Serious Adverse Events (SAE), Adverse Events of Special Interest (AESI), and Physical Examination Findings
- Serum Concentrations for Trastuzumab Deruxtecan, total anti-HER2 antibody, and Active Metabolite MAAA-
- Percentage of Participants Who Are Anti-Drug Antibody (ADA)-Positive (Baseline and Post-Baseline)
The immunogenicity of trastuzumab deruxtecan will be assessed.
- Percentage of Participants Who Have Treatment-emergent ADAs
The immunogenicity of trastuzumab deruxtecan will be assessed.

+81-3-3542-2511

Yes

Plan Description: De-identified individual participant data (IPD) and applicable supporting clinical trial documents may be available upon request at https://vivli.org/. In cases where clinical trial data and supporting documents are provided pursuant to our company policies and procedures, Daiichi Sankyo will continue to protect the privacy of our clinical trial participants. Details on data sharing criteria and the procedure for requesting access can be found at this web address: https://vivli.org/ourmember/daiichi-sankyo/ Supporting Documents: - Study Protocol - Statistical Analysis Plan - Clinical Study Report Time Frame: Studies for which the medicine and indication have received European Union (EU) and United States (US), and/or Japan (JP) marketing approval on or after 01 January 2014 or by the US or EU or JP Health Authorities when regulatory submissions in all regions are not planned and after the primary study results have been accepted for publication. Access Criteria: Formal request from qualified scientific and medical researchers on IPD and clinical study documents from clinical trials supporting products submitted and licensed in the United States, the European Union and/or Japan from 01 January 2014 and beyond for the purpose of conducting legitimate research. This must be consistent with the principle of safeguarding study participants' privacy and consistent with provision of informed consent. URL: https://vivli.org/ourmember/daiichi-sankyo/

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