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Updated: May 25, 2026

Induction of Alloantigen-specific Anergy in Human Peripheral Blood Mononuclear Cells by Alloantigen Stimulation with Co-stimulatory Signal Blockade

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Nonengraftment haploidentical cellular therapy for hematologic malignancies.

John L Reagan¹, Loren D Fast, Eric S Winer

¹Division of Hematology and Oncology, Rhode Island Hospital, The Warren Alpert Medical School, Providence, RI 02903, USA.

Advances in Hematology

|February 8, 2012

Summary

Allogeneic transplant benefits stem from graft versus tumor effects, not myeloablation. Minimal conditioning with stem cell infusions shows promise in refractory malignancies by breaking tumor immune tolerance.

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Area of Science:

Immunology
Oncology
Hematology

Background:

Allogeneic transplant's therapeutic benefit is largely attributed to the graft-versus-tumor (GVT) effect.
Engraftment is driven by competitive dynamics between donor and host cells, rather than myeloablation.
Clinical application of competitive engraftment alone is impractical due to the high cell dose requirement.

Purpose of the Study:

To investigate the efficacy of allogeneic peripheral blood stem cell infusions with minimal conditioning in patients with refractory malignancies.
To explore the mechanisms underlying anti-tumor responses in this setting.

Main Methods:

Utilized allogeneic matched and haploidentical peripheral blood stem cell infusions.
Employed minimal conditioning regimens, including low-level host irradiation.
Administered to heavily pretreated patients with refractory malignancies.

Main Results:

Engraftment was transient or not observed in most patients.
Compelling anti-tumor responses were observed in a significant portion of the patient cohort.
Responses correlated with the breaking of tumor immune tolerance.

Conclusions:

Minimal conditioning allogeneic stem cell infusions can induce potent anti-tumor activity in refractory malignancies.
The anti-tumor effect appears mediated by host immune system activation, involving cytokines like IFNγ and various immune cells.
This approach offers a potential therapeutic strategy for patients with limited options.