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Metastatic Breast CancerPhase 1DB-08NCT04556773

A Phase 1b Study of T-DXd Combinations in HER2-low Advanced or Metastatic Breast Cancer

A Phase 1 study testing Trastuzumab deruxtecan, Durvalumab and Paclitaxel in people with Metastatic Breast Cancer, run by AstraZeneca at 37 sites in 10 countries.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
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Trial summary

DESTINY-Breast 08 will investigate the safety, tolerability, PK and preliminary anti-tumour activity of T-DXd in combination with other therapies in patients with Metastatic HER2-low Advanced or Metastatic Breast Cancer Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Metastatic Breast Cancer
What is being tested?
Trastuzumab deruxtecan, Durvalumab and Paclitaxel
Could I receive a placebo?
No, everyone receives an active treatment
How many people
138 participants
Where
37 sitesin 10 countries
Study dates
17 Dec 2020to 1 Jun 2027
Phase
Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patients must be at least 18 years of age
  • Male or female patients who have pathologically documented breast cancer that:
  • Has a history of HER2-low expression, defined as IHC 2+/ISH- or IHC 1+ (ISH- or untested) with a validated assay
  • Is documented as HR+ (either ER and/or PgR positive [ER or PgR ≥1%]) or ER and PgR negative (ER and PgR <1%) per ASCO/CAP guidelines in the metastatic setting
  • Patient must have adequate tumor sample for biomarker assessment
  • ECOG Performance Status of 0 or 1
Show all 12Show fewer
  • For patients with HR+ disease:
  • Part 1: At least 1 prior treatment line of ET with or without a targeted therapy (such as CDK4/6, mTOR or PI3-K inhibitors), and at least 1 prior line of chemotherapy for MBC are required.
  • Part 2: Only 1 prior treatment line of ET with or without a targeted therapy (such as CDK4/6, mTOR or PI3-K inhibitors) for MBC is allowed. No prior chemotherapy in the metastatic setting is allowed. Note there are no patients with HR+ disease in Part 2 of Modules 2 and 3.
  • For patients with HR- disease:
  • Part 1: At least 1 prior line of chemotherapy for MBC is required. Note there are no patients with HR- disease in Part 1 of Modules 4 and 5.
  • Part 2: For Module 2, no prior lines of therapy for MBC are allowed, and for Modules 1 and 3, only 1 prior line of chemotherapy for MBC is allowed. Note there are no patients with HR- disease in Part 2 of Modules 4 and 5.

Who cannot join

  • Uncontrolled intercurrent illness
  • Uncontrolled or siginificant cardiovascular disease
  • History of (non-infectious) ILD/pneumonitis that required steroids, has current ILD/pneumonitis, or where suspected ILD/pneumonitis cannot be ruled out by imaging at screening.
  • Lung-specific intercurrent clinically significant illnesses
  • Has spinal cord compression or clinically active central nervous system metastases
  • Active primary immunodeficiency
  • Uncontrolled infection requiring IV antibiotics, antivirals, or antifungals
  • Prior treatment with ADC that comprises of an exatecan derivative that is a topoisomerase I inhibitor.

Trial locations and contacts

37 sites in 10 countries.

37 sites in 10 countries

United States9 sites
  • Research Site

    Chapel Hill, North Carolina, 27514

  • Research Site

    Chattanooga, Tennessee, 37404

  • Research Site

    Commack, New York, 11725

  • Research Site

    Fort Worth, Texas, 76104

  • Research Site

    Germantown, Tennessee, 38138

  • Research Site

    Harrison, New York, 10604

  • Research Site

    New York, New York, 10029

  • Research Site

    New York, New York, 10065

  • Research Site

    Uniondale, New York, 11553

Other trials in United States

Taiwan7 sites
  • Research Site

    Kaohsiung City, 82445

  • Research Site

    Taichung, 40443

  • Research Site

    Taipei, 100

  • Research Site

    Taipei, 11217

  • Research Site

    Taipei, 114

  • Research Site

    Taipei, 235

  • Research Site

    Taoyuan, 333

Other trials in Taiwan

Brazil5 sites
  • Research Site

    Goiânia, 74605-070

  • Research Site

    Porto Alegre, 90035-003

  • Research Site

    Porto Alegre, 90110-270

  • Research Site

    São Paulo, 03102-002

  • Research Site

    São Paulo, 04543-000

Other trials in Brazil

South Korea4 sites
  • Research Site

    Seoul, 03080

  • Research Site

    Seoul, 03722

  • Research Site

    Seoul, 05505

  • Research Site

    Seoul, 06351

Other trials in South Korea

Belgium3 sites
  • Research Site

    Edegem, 2650

  • Research Site

    Leuven, 3000

  • Research Site

    Ottignies, 1340

Other trials in Belgium

Russia3 sites
  • Research Site

    Moscow, 115478

  • Research Site

    Moscow, 143442

  • Research Site

    Saint Petersburg, 199226

Other trials in Russia

Australia2 sites
  • Research Site

    Melbourne, 3000

  • Research Site

    Westmead, 2145

Other trials in Australia

Canada2 sites
  • Research Site

    Kelowna, British Columbia, V1Y 5L3

  • Research Site

    Québec, Quebec, G1J 1Z4

Other trials in Canada

France1 site
  • Research Site

    Villejuif, 94805

Other trials in France

Mexico1 site
  • Research Site

    Monterrey, 64710

Other trials in Mexico

About this study

Official title: A Phase 1b Multicentre, Open-label, Modular, Dose-finding and Dose-expansion Study to Explore the Safety, Tolerability, Pharmacokinetics and Anti-tumour Activity of Trastuzumab Deruxtecan (T-DXd) in Combination With Other Anti-cancer Agents in Patients With Metastatic HER2-low Breast Cancer (DESTINY-Breast08)

DESTINY-Breast 08 will investigate the safety, tolerability, PK and preliminary anti-tumour activity of T-DXd in combination with other therapies in patients with Metastatic HER2-low Advanced or Metastatic Breast Cancer

Read the detailed description

This study is modular in design allowing assessment of the safety, tolerability, PK and preliminary anti-tumour activity of T-DXd in combination with other therapies. Combination-treatment modules will have 2 parts: a dose-finding phase (Part 1), and a dose expansion phase (Part 2); the Part 2 dose-expansion phase will use the RP2D determined in Part 1.

The target population of interest in this study is patients with HER2-low (IHC 1+ or IHC 2+/ISH -) (as per ASCO/CAP 2018 guidelines) advanced/MBC. Part 1 of each module will enroll patients with locally confirmed HER2-low advanced/MBC in second-line or later (≥ 2L) settings

Part 2 of each module will enroll patients with HER2-low MBC who have either not received prior treatment, or received only 1 prior treatment (depending on the module-specific exclusion criteria) for advanced/metastatic disease

Being tested
Trastuzumab deruxtecan, Durvalumab, Paclitaxel, Capivasertib, Anastrozole
Keywords
Breast Cancer, HER2-negative, HER2-low, Trastuzumab Deruxtecan, T-DXd, DS-8201a, DESTINY-Breast08, Anti-HER2 Antibody Drug Conjugate (ADC), Triple-negative breast cancer (TNBC)
Medical subject headings
Breast Neoplasms, Triple Negative Breast Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Trastuzumab deruxtecanDrug

    Also called DS-8201a, T-DXd

    T-DXd: administered as an IV infusion

  • DurvalumabDrug

    Also called MEDI4736

    Durvalumab: administered as an IV infusion

  • PaclitaxelDrug

    Also called Taxol A

    Paclitaxel: administered as an IV infusion

  • CapivasertibDrug

    Also called AZD5363

    Capivasertib: administered orally

  • AnastrozoleDrug

    Also called Anastrozol

    Anastrozole: administered orally

  • FulvestrantDrug

    Fulvestrant: administered as an IM injection

  • CapecitabineDrug

    Capecitabine: administered orally

Study groups in NCT04556773
Study groupRoleWhat they receive
Module 1: T-DXd + capecitabineExperimentalT-DXd: 5.4 mg/kg Q3W, intravenous use Capecitabine: 1000mg/m2 BID, days 1-14 Q3W, oral use
Receives: Drug: Trastuzumab deruxtecan; Drug: Capecitabine
Module 2: T-DXd + durvalumab + paclitaxelExperimentalT-DXd: 5.4 mg/kg Q3W, intravenous use Durvalumab: 1120 mg Q3W, intravenous use Paclitaxel: 80 mg/m2 QW in 3-week cycles, intravenous use
Receives: Drug: Trastuzumab deruxtecan; Drug: Durvalumab; Drug: Paclitaxel
Module 3: T-DXd + capivasertibExperimentalT-DXd: 5.4 mg/kg Q3W, intravenous use Capivasertib: 400 mg BID, oral use
Receives: Drug: Trastuzumab deruxtecan; Drug: Capivasertib
Module 4: T-DXd + anastrozoleExperimentalT-DXd: 5.4 mg/kg Q3W, intravenous use Anastrozole: 1 mg daily, oral
Receives: Drug: Trastuzumab deruxtecan; Drug: Anastrozole
Module 5: T-DXd + fulvestrantExperimentalT-DXd: 5.4 mg/kg Q3W, intravenous use Fulvestrant: 500 mg Q4W, intramuscular use
Receives: Drug: Trastuzumab deruxtecan; Drug: Fulvestrant

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Occurrence of adverse events (AEs)- Part 1

    Occurrence of AEs in Part 1 graded according to NCI CTCAE v5.0

    Measured: Up to follow-up period, approximately 24 months

  2. Occurrence of serious adverse events (SAEs)- Part 1

    Occurrence of SAEs in Part 1 graded according to NCI CTCAE v5.0

    Measured: Up to follow-up period, approximately 24 months

  3. Occurrence of adverse events (AEs)- Part 2

    Occurrence of AEs in Part 2 graded according to NCI CTCAE v5.0

    Measured: Up to follow-up period, approximately 24 months

  4. Occurrence of serious adverse events (SAEs)- Part 2

    Occurrence of SAEs in Part 2 graded according to NCI CTCAE v5.0

    Measured: Up to follow-up period, approximately 24 months

Secondary outcomes (8)
  1. Objective Response Rate (ORR)- Part 2

    ORR defined as the proportion of patients who have a confirmed CR or PR, as determined by the investigator at local site per RECIST 1.1

    Measured: Until progression, assessed up to approximately 24 months

  2. Progression Free Survival (PFS)- Part 2

    PFS defined as time from the date of first dose until the date of progression as determined by the investigator at local site per RECIST 1.1, or death due to any cause

    Measured: Until progression or death, assessed up to approximately 24 months

  3. Duration of Response (DoR)- Part 2

    DoR defined as time from the date of first documented response (which is subsequently confirmed) until the date of documented progression or death in the absence of disease progression

    Measured: Until progression or death, assessed up to approximately 24 months

  4. Overall Survival (OS)- Part 2

    OS defined as time from the date of first dose until the date of death by any cause

    Measured: Until death, assessed up to approximately 24 months

  5. Serum concentration of T-DXd, total anti-HER2 antibody and MAAA-1181a

    Determination of trastuzumab deruxtecan concentration in serum at different time points after trastuzumab deruxtecan administration

    Measured: While on study drug up to study completion, approximately 24 months

  6. Immunogenicity of trastuzumab deruxtecan

    Percentage of patients who develop ADA for trastuzumab deruxtecan

    Measured: Up to follow-up period, approximately 24 months

  7. Serum Concentration of durvalumab

    Determination of durvalumab concentration in serum at different time points after administration

    Measured: While on study drug up to study completion, approximately 24 months

  8. Immunogenicity of durvalumab

    Percentage of patients who develop ADAs for durvalumab

    Measured: Up to follow-up period, approximately 24 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted21 Sep 2020
  2. Study start17 Dec 2020
  3. Primary completion16 Aug 2023
  4. Study completion1 Jun 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Parallel groups
Model description
The study will initially consist of 5 treatment modules, each of which includes T-DXd in combination with other anti-cancer agents. Each module will have 2 parts: a dose-finding phase (Part 1) and a dose-expansion phase (Part 2). The Part 2 dose-expansion phase will use the recommended Phase 2 dose (RP2D) for the combination, either as determined in Part 1 or from another clinical study if appropriate. For each module, patients will be centrally assigned to one of the open modules, as per the module specific criteria. In addition to safety and tolerability, this study will also assess ORR, PFS, DoR, and OS for each treatment combination.
Masking
None (open label)
Enrolment
138 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04556773
Sponsor's protocol ID
D967JC00002
Other IDs
2023-505690-33-00, 2020-002797-27, 2023
Acronym
DB-08
Status last verified
Jul 2026
First submitted
15 Sep 2020
Last updated
3 Aug 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: Qualified researchers can request access to anonymized individual patient-level data from AstraZeneca group of companies sponsored clinical trials via the request portal. All request will be evaluated as per the AZ disclosure commitment: https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure. Yes, indicates that AZ are accepting requests for IPD, but this does not mean all requests will be shared.

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Trastuzumab deruxtecan, Durvalumab and Paclitaxel in people with Metastatic Breast Cancer, run by AstraZeneca at 37 sites in 10 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 12 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 3 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 37 sites in United States, Taiwan, Brazil, South Korea, Belgium and 5 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Occurrence of adverse events (AEs)- Part 1 (time frame: Up to follow-up period, approximately 24 months). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 3 Aug 2026.

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