ASPEN-09-03: A Study of Evorpacept in Combination With Trastuzumab and Chemotherapy in Metastatic HER2-Positive Breast Cancer

Official record

Identifier

NCT07007559

Recruiting locations

countries

United StatesCanadaFranceItalySingaporeSouth KoreaSpainUnited Kingdom

Interventions studied

Evorpacept (ALX148)TrastuzumabPaclitaxelCapecitabineEribulinGemcitabineVinorelbine

Lead sponsor

ALX Oncology Inc.

Target enrolment

120 participants

Study type

INTERVENTIONAL

Phase

Phase 2

Status

Recruiting

First posted

Jun 6, 2025

Last updated on the registry

Sep 25, 2026

Age

18 Years

Sex

ALL

Study contact

The official record lists a study contact. Contact details are published there and are intentionally not copied to this page.

Eligibility criteria

Reproduced verbatim from the official record. Eligibility is decided by the study team, never by this page.

Inclusion Criteria:

* Histologically confirmed invasive HER2+ breast cancer based on an evaluable tumor tissue biopsy obtained after cessation of T-DXd (ENHERTU) treatment and no more than 6 months prior to C1D1.
* Received no more than 4 prior lines of HER2-directed therapy including at least one prior line of T-DXd (ENHERTU) for locally advanced/metastatic HER2+ breast cancer. Prior neoadjuvant therapy which resulted in relapse within 6 months of completion of T-DXd will be considered a line of treatment for metastatic disease. Participants who discontinue T-DXd due to intolerance are considered eligible.
* Progressed on or following the most recent line of therapy.
* Eligible to receive one of the following chemotherapy options (capecitabine, eribulin, gemcitabine, paclitaxel or vinorelbine).
* Measurable disease as defined by RECIST v1.1.
* LVEF ≥50%.
* Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) must be 0 to 1.
* Life expectancy of at least 3 months.
* Adequate renal function (estimated creatinine clearance ≥30 mL/min as calculated using the Cockcroft-Gault equation or Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation.
* Adequate liver function:

  * Total bilirubin ≤1.5 x upper limit of normal (ULN) (≤3.0 x ULN if the participant has documented Gilbert syndrome);
  * Aspartate and alanine transaminase (AST and ALT) ≤3 x ULN (≤5.0 x ULN if liver involved by metastatic disease).
* Participants must have recovered from all AEs due to previous therapies, procedures, and surgeries to baseline severity or ≤Grade 1 per NCI CTCAE v5.0 except for AEs not deemed reversible and which do not constitute a safety risk by Investigator judgment.

Exclusion Criteria:

* Untreated CNS metastases.
* Prior exposure to any anti-CD47 or anti-SIRPα agent.
* Any condition that would be contraindicated to receiving trastuzumab
* Has a diagnosis of complete dihydropyrimidine dehydrogenase (DPD) deficiency or significant toxicity with prior flurouracil (5FU) based regimen
* Following anti-cancer therapy with insufficient washout before start of treatment:

  1. chemotherapy, hormonal therapy, radiation therapy or small molecule anti-cancer therapy within 14 days or 5 half-lives (whichever is shorter) of start of treatment.
  2. Immune therapy or other biologic therapy (e.g., monoclonal antibodies, antibody-drug conjugates) for the treatment of cancer for: 28 days or 5 half-lives (whichever is shorter) of start of treatment).
* History of autoimmune hemolytic anemia, autoimmune thrombocytopenia, or hemolytic transfusion reaction.
* Had an allogeneic tissue/solid organ transplant.
* Any active, unstable cardiovascular disease.
* Intolerance to or who have had a severe allergic or anaphylactic reaction to antibodies or infused therapeutic proteins or participants who have had a severe allergic or anaphylactic reaction to any of the substances included in the study drug (including excipients).
* Has an active autoimmune disease that has required systemic treatment in past 2 years.
* Other primary malignancy within 2 years.

Indexed under

Breast Cancer