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Study identifier: NCT05159778 Synced from ClinicalTrials.gov · July 28, 2026
● Completed

Phase 2 Study of Imprime PGG and Pembrolizumab in Patients With HR+/HER2- Metastatic Breast Cancer (mBCA)

Condition: Malignant Neoplasm of Breast  ·  Sponsor: HiberCell, Inc.

PhasePhase 2
Planned participants26
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersNo

About this study

The primary objective of this Phase 2 Simon 2-Stage study is to determinate the Overall Response Rate (ORR) per RECIST v1.1 following treatment with Imprime PGG + pembrolizumab in patients with ER/PR+/ HER2(-) metastatic breast cancer who have progressed through prior hormone therapy with at least one CDK4/6 inhibitor, and a maximum of 2 subsequent chemotherapy treatment. Patients will be screened for baseline anti-β glucan antibody level (ABA; measured in peripheral blood). Those patients with an ABA greater than or equal to 20 mcg/ml and meeting all other I/E criteria, will be enrolled. The study will enroll 47 patients with 23 patients enrolled into Stage 1. If 4 or more patients in Stage 1 have an objective response after 12 weeks of treatment, the study will proceed into Stage 2. A total of 24 patients will be enrolled in Stage 2 for a total combined population of 47. Overall, objective responses must be observed in 10 patients for the study to be declared a success.

This description comes directly from the study's public registry record.

Talk to the study team

Contact details are listed per location below or on the registry record.

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Locations (16)

The University of Arizona Cancer Center - North CampusTucson, Arizona, United States
The University of Arizona Cancer CenterTucson, Arizona, United States
University of Colorado at DenverDenver, Colorado, United States
University of Miami and Clinics -Sylvester Comprehensive Cancer CenterMiami, Florida, United States
Mt. Sinai (Miami)Miami Beach, Florida, United States
Moffitt Cancer CenterTampa, Florida, United States
Louisiana State University Health Sciences Center - New OrleansNew Orleans, Louisiana, United States
HealthPartners Cancer Research CenterSaint Louis Park, Minnesota, United States
St. Luke's Cancer InstituteKansas City, Missouri, United States
St. Vincent - Frontier Cancer CenterBillings, Montana, United States
University of New Mexico Comprehensive Cancer CenterAlbuquerque, New Mexico, United States
Columba University Medical CenterNew York, New York, United States

+ 4 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT05159778