Assessing and mitigating the interference of ALX148, a novel CD47 blocking agent, in pretransfusion compatibility testing.

Abstract:

:ALX148, a novel CD47 blocking agent, is in clinical development for the treatment of advanced solid tumors and lymphoma. Because CD47 is highly expressed on red blood cells (RBCs), its therapeutic blockade can potentially interfere with pretransfusion compatibility testing. This study describes the interference of ALX148 in pretransfusion compatibility testing and evaluates the methods used for mitigating such interference. STUDY DESIGN AND METHODS:Routine serologic tests were performed on six samples from four patients treated with ALX148. Antibody screening tests were performed on ALX148-spiked plasma, and RBC testing including antigen typing was performed on ALX148-coated RBCs. Soluble CD47 or high-affinity signal regulatory protein α (SIRPα) monomers were used to remove the false-positive reactivity of ALX148-spiked plasma with or without anti-E. RESULTS:ALX148 caused false-positive reactivity in antibody screening using indirect antiglobulin testing (IAT) and two-stage papain testing. However, false-positive reactivity was not observed at the immediate spin (IS), room temperature (RT), and 37°C phases. Direct antiglobulin testing, autologous controls, and eluates showed positive results. ALX148 did not affect blood group antigen typing performed at the IS or RT phases. The use of 50- to 100-fold molar excess of soluble CD47 or 300-fold molar excess of high-affinity SIRPα monomers removed false-positive reactivity in IAT without affecting anti-E detection. CONCLUSION:ALX148 generates false-positive reactivity in IAT, interfering with pretransfusion compatibility testing. The use of soluble CD47 or high-affinity SIRPα monomers can resolve the interference without possibly missing clinically significant alloantibodies.

journal_name

Transfusion

journal_title

Transfusion

authors

Kim TY,Yoon MS,Hustinx H,Sim J,Wan HI,Kim H

doi

10.1111/trf.16009

subject

Has Abstract

pub_date

2020-08-20 00:00:00

eissn

0041-1132

issn

1537-2995

pub_type

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