title: Recent advances in understanding the clinical relevance of antiplatelet alloantibodies.
abstract: Alloimmunization to human platelet antigens (HPAs) may occur either during pregnancy, when a HPA‑negative mother gives birth to a newborn who inherits HPAs from the father, or following blood transfusion or stem cell transplantation. Antiplatelet alloantibodies do not cause thrombocytopenia in a patient, but their detection must always be recorded in medical records because they may induce fetal and neonatal alloimmune thrombocytopenia in present and all subsequent pregnancies, platelet refractoriness, posttransfusion purpura, or prolonged thrombocytopenia with engraftment failure after stem cell transplantation. Passive transfer of platelet alloantibodies through transfused blood components may trigger thrombocytopenia and severe posttransfusion reactions in the recipient. In a Caucasian population, such clinical outcome of platelet alloimmunization is mostly due to anti‑HPA‑1a antibodies, less frequently to anti‑HPA‑5b, anti‑HPA‑1b, and others. Information on anti‑HPA alloantibodies is crucial for the prevention and treatment of their consequences.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Guz
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Uhrynowska
authors.forename: Izabella
authors.initials: I
authors.lastname: Kopeć
authors.forename: Marzena
authors.initials: M
authors.lastname: Dębska
authors.forename: Anne
authors.initials: A
authors.lastname: Husebekk
authors.forename: Ewa
authors.initials: E
authors.lastname: Brojer
mesh_terms: D016824:Antigens, Human Platelet / Q000276:immunology*; D001803:Blood Transfusion; D005260:Female; D006801:Humans; D007518:Isoantibodies; D011247:Pregnancy; D033581:Stem Cell Transplantation / Q000009:adverse effects; D065227:Transfusion Reaction
chemical_list: D016824:Antigens, Human Platelet; D007518:Isoantibodies