Rallybio Announces Publication of Data Highlighting the Ability of HPA-1a-Specific Antibodies to Prevent Alloimmunization in an Authentic Mouse Model of FNAIT

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Dec 15, 2022

Rallybio Corporation (Nasdaq: RLYB) today announced publication of preclinical study results for two human HPA-1a-specific antibodies in development for the prevention of FNAIT. The results demonstrate that low doses of the two HPA-1a-specific antibodies, the polyclonal candidate RLYB211 and the monoclonal candidate RLYB212, are equally effective at rapidly clearing HPA-1a-positive platelets from circulation and preventing alloimmunization to HPA-1a. As expected, prophylactically blocking HPA-1a alloimmunization prevented the onset of FNAIT. These results also establish the concentration-effect relationship and threshold exposure targets for effective prophylactic treatment with HPA-1a specific antibodies to prevent FNAIT. The findings were published in the journal Blood, the official journal of the American Society of Hematology.