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Breast CarcinomaPhase 2/3AIPAC-003NCT05747794

Study in Metastatic Breast Cancer Patients Receiving Eftilagimod Alpha or Placebo in Combination With Paclitaxel Chemotherapy

A Phase 2/3 study testing eftilagimod alpha and Paclitaxel in people with Breast Carcinoma, run by Immutep S.A.S. at 22 sites in 5 countries.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

The goal of this clinical trial is to compare the safety and efficacy of eftilagimod alpha (efti) in combination with paclitaxel standard of care chemotherapy in participants with metastatic breast cancer. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Breast Carcinoma
What is being tested?
eftilagimod alpha and Paclitaxel
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
72 participants
Where
22 sitesin 5 countries
Study dates
22 May 2023to 30 Jun 2026
Phase
Phase 2/3
Are there results?
None posted in the registry

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

  • Metastatic HR+ positive (estrogen receptor positive and/or progesterone receptor positive) or hormone receptor negative (HR˗), and HER2-neg breast adenocarcinoma, histologically proven by biopsy on the last available tumor tissue
  • Participants with HR+ metastatic breast cancer (MBC) who progressed on or after ≥1 line of endocrine based therapy and are indicated to receive chemotherapy for metastatic disease
  • Participants with HR- MBC (i.e. triple-negative breast cancer [TNBC]) who are indicated to receive paclitaxel chemotherapy without PD 1/PD-L1 therapy in the 1st line setting for metastatic disease
  • ECOG performance status 0-1
  • Expected survival longer than three months

Who cannot join

  • Prior chemotherapy for metastatic breast adenocarcinoma
  • Participants with HR+ MBC who have received <1 line of ET based therapy in the metastatic setting
  • Participants with HR+ MBC who are not primary or secondary resistant to ET-based therapy and would be candidates to ET based therapy as per applicable treatment guidelines
  • TNBC participants who are candidates for PD-1/PD-L1 therapy in combination with chemotherapy
  • Disease-free interval of less than twelve months from the last dose of adjuvant chemotherapy

Trial locations and contacts

22 sites in 5 countries.

22 sites in 5 countries

Spain9 sites
  • Institut Català d'Oncologia

    Badalona, 08916

  • VHIO - Hospital Vall d'Hebron

    Barcelona, 08035

  • Hospital Clinic de Barcelona

    Barcelona, 08036

  • Parc Taulí Hospital Universitari

    Barcelona, 08208

  • Hospital Universitario Reina Sofia

    Córdoba, 14004

  • Hospital Universitario de Jaén

    Jaén, 23007

  • Unidad Ensayos Clínicos Oncología Fundació IRB Lleida

    Lleida, 25196

  • START Madrid - FJD, Hospital Fundación Jiménez Diaz

    Madrid, 28040

  • Hospital Universitario La Paz

    Madrid, 28046

Other trials in Spain

Belgium6 sites
  • AZ Sint-Jan Brugge Oostende av

    Bruges

  • Cliniques Universitaires Saint-Luc

    Brussels, 1200

  • Grand Hopital de Charleroi - Hopital Notre Dame

    Charleroi, 6000

  • Universitair Ziekenhuizen Antwerpen

    Edegem, 2650

  • Centre Hospitalier de l'Ardenne

    Libramont, 6800

  • Clinique Saint-Pierre- Ottignies

    Ottignies-Louvain-la-Neuve

Other trials in Belgium

United States5 sites
  • Oncology Consultants

    Houston, Texas, 77024

  • The University of Texas MD Anderson Cancer Center

    Houston, Texas, 77030

  • Carolina Blood and Cancer Care Associates

    Rock Hill, South Carolina, 29723

  • The George Washington University Cancer Center

    Washington D.C., District of Columbia, 20037

  • The Oncology Institute

    Whittier, California, 90602

Other trials in United States

Georgia1 site
  • ARENSIA Exploratory Medicine LLC

    Tbilisi

Other trials in Georgia

Moldova1 site
  • ARENSIA Exploratory Medicine Phase I Unit

    Chisinau, 2025

Other trials in Moldova

About this study

Official title: AIPAC-003 (Active Immunotherapy and PAClitaxel): A Randomized, Double-blind, Placebo-controlled Phase 3 Trial Testing Eftilagimod Alpha (Soluble LAG-3) in HER2-neg/Low Metastatic Breast Cancer Patients Receiving Paclitaxel, Following an Open-label Dose Optimization

The goal of this clinical trial is to compare the safety and efficacy of eftilagimod alpha (efti) in combination with paclitaxel standard of care chemotherapy in participants with metastatic breast cancer.

The main questions it aims to answer are:

Read more
  • What is the optimal biological dose (OBD) of efti in combination with weekly paclitaxel chemotherapy?
  • Can efti combined with weekly paclitaxel chemotherapy prolong overall survival in participants with metastatic breast cancer if compared to weekly paclitaxel chemotherapy alone?

In the first component of the trial (phase 2, lead-in) researchers will compare two groups (different dose levels of efti in combination with standard chemotherapy) to see if the treatment is safe and well tolerated and evaluate which is the optimal biological dose. In the second component of the trial (phase 3) researchers will assess if the treatment of metastatic breast cancer with the optimal biological dose of efti in combination with paclitaxel is superior compared to chemotherapy alone (placebo-controlled).

The treatment concept of each trial component consists of a chemo-immunotherapy phase followed by an immunotherapy phase. In the first phase participants will be treated with efti plus paclitaxel chemotherapy or placebo plus paclitaxel chemotherapy. After completion of the chemotherapy per standard of care, participants will be treated with the study agent alone.

Read the detailed description

The AIPAC-003 trial consists of an open-label dose optimization lead-in component followed by a double-blinded, randomized, placebo-controlled phase 3 component.

The main objectives of the dose optimization lead-in (phase 2) are to evaluate and compare the safety and tolerability of 2 different dose levels of efti (30 mg and 90 mg) combined with paclitaxel, and to define the optimal biological dose (OBD) of efti in combination with weekly paclitaxel for the phase 3 part of the trial. Recruitment to the dose-optimization lead-in will be considered complete when 29 participants per cohort are randomized and considered evaluable for OBD analysis.

The main objective of the phase 3 is to demonstrate that overall survival (OS) is superior in participants treated with efti combined with weekly paclitaxel compared to weekly paclitaxel plus placebo. Approximately 771 participants will be randomized 2:1 to Arm A (active arm): paclitaxel + efti at OBD and Arm B (control arm): paclitaxel + placebo. The exact patient population will be defined after determination of the OBD.

The duration of the trial will be approximately 24 months for the dose optimization lead-in component and 60 months for the phase 3 component. The phase 3 will start prior to the completion of the phase 2 (once the OBD has been defined).

It is planned to conduct the trial at up to 20 sites in up to 4 countries across North America and Europe for the lead-in and at up to 150 sites in up to 25 countries across North America, Europe, Latin America and the Asian Pacific region for the phase 3.

Being tested
eftilagimod alpha, Paclitaxel, placebo
Medical subject headings
Breast Neoplasms

What participants receive

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

  • eftilagimod alphaBiological

    Also called IMP321, efti, LAG-3Ig, eftilagimod alfa

    APC activator, MHC II agonist

  • PaclitaxelDrug

    paclitaxel will be given as standard of care (chemotherapy)

  • placeboOther

    Also called placebo matching eftilagimod alpha

    placebo matching eftilagimod alpha

Study groups in NCT05747794
Study groupRoleWhat they receive
open label lead-in (phase 2): eftilagimod alpha 30mg + paclitaxelExperimentaleftilagimod alpha 30mg s.c. + 80mg/m^2 paclitaxel i.v. (same-day administration): The trial consists of a chemo-immunotherapy (chemo-IO) phase followed by an immunotherapy (IO)-phase. The chemo-IO phase consists of a planned 6 cycles of 4 weeks (28 days each) that may be longer or shorter depending on chemo tolerance. The IO-phase is planned to follow the chemo-IO phase. A maximum of 13 cycles (approx. 12 months) of treatment is planned.
Receives: Biological: eftilagimod alpha; Drug: Paclitaxel
open label lead-in (phase 2): eftilagimod alpha 90mg + paclitaxelExperimentaleftilagimod alpha 90mg s.c. + 80mg/m^2 paclitaxel i.v. (same-day administration): The trial consists of a chemo-immunotherapy (chemo-IO) phase followed by an immunotherapy (IO)-phase. The chemo-IO phase consists of a planned 6 cycles of 4 weeks (28 days each) that may be longer or shorter depending on chemo tolerance. The IO-phase is planned to follow the chemo-IO phase. A maximum of 13 cycles (approx. 12 months) of treatment is planned.
Receives: Biological: eftilagimod alpha; Drug: Paclitaxel
Phase 3: eftilagimod alpha + paclitaxelExperimentaleftilagimod alpha s.c. (OBD) + 80mg/m^2 paclitaxel i.v. (same-day administration): The trial consists of a chemo-immunotherapy (chemo-IO) phase followed by an immunotherapy (IO)-phase. The chemo-IO phase consists of a planned 6 cycles of 4 weeks (28 days each) that may be longer or shorter depending on chemo tolerance. The IO-phase is planned to follow the chemo-IO phase. A maximum of 13 cycles (approx. 12 months) of treatment is planned.
Receives: Biological: eftilagimod alpha; Drug: Paclitaxel
Phase 3: placebo + paclitaxelPlacebo comparatorplacebo s.c. + 80mg/m^2 paclitaxel i.v. (same-day administration): The trial consists of a chemo-immunotherapy (chemo-IO) phase followed by an immunotherapy (IO)-phase. The chemo-IO phase consists of a planned 6 cycles of 4 weeks (28 days each) that may be longer or shorter depending on chemo tolerance. The IO-phase is planned to follow the chemo-IO phase. A maximum of 13 cycles (approx. 12 months) of treatment is planned.
Receives: Drug: Paclitaxel; Other: placebo

What is being measured

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

  1. Determination of Overall survival (OS)

    Primary endpoint for Phase 3 portion, secondary endpoint for Phase 2 lead-in portion

    Measured: Until trial end, death, withdrawal of consent or lost to follow-up, assessed up to 60 months

  2. Determination of the Optimal Biological Dose (OBD)

    Measured: Up to 15 months

  3. Frequency of adverse events (AEs)

    Measured: Up to 15 months

  4. Severity of adverse events (AEs)

    Measured: Up to 15 months

  5. Duration of adverse events (AEs)

    Measured: Up to 15 months

  6. Occurrence of dose-limiting toxicities (DLTs)

    Measured: Up to 15 months

Secondary outcomes (2)
  1. Determination of Progression Free Survival (PFS), based on RECIST, v1.1

    Measured: Until occurrence of progressive disease, or the start of any further next line anticancer treatment, or until the end of the trial for any other reason, assessed up to 60 months

  2. Evaluation of Objective Response Rate (ORR) based on RECIST v1.1

    Measured: Until occurrence of progressive disease, or the start of any further next line anticancer treatment, or until the end of the trial for any other reason, assessed up to 60 months

Timeline

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

  1. First posted28 Feb 2023
  2. Study start22 May 2023
  3. Primary completion30 Apr 2026
  4. Study completion30 Jun 2026

Why it stopped: Sponsor Decision

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 2/3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
This trial consists of an open-label dose optimization lead-in component (phase 2) followed by a double-blinded, randomized, placebo-controlled phase 3 component.
Masking
Double blind
Who is masked
Participant, Investigator
Enrolment
72 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05747794
Sponsor's protocol ID
AIPAC-003
Other IDs
2022-003323-17, 2024-511023-34-00
Acronym
AIPAC-003
Status last verified
Jul 2026
First submitted
2 Feb 2023
Last updated
30 Jul 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 2/3 study testing eftilagimod alpha and Paclitaxel in people with Breast Carcinoma, run by Immutep S.A.S. at 22 sites in 5 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 5 inclusion and 5 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: stopped early, as of the sponsor's last update on 30 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 22 sites in Spain, Belgium, United States, Georgia, Moldova. 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. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

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

Are results available for this study?

The study was stopped early (reason given: Sponsor Decision). Results are not available in the source record.

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?

Determination of Overall survival (OS) (time frame: Until trial end, death, withdrawal of consent or lost to follow-up, assessed up to 60 months). The study lists 6 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 30 Jul 2026; AzTrials last refreshed its copy on 6 Nov 2026.

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