To identify and analyze hematopoietic adverse drug reaction (ADR) signals associated with Olaparib, Niraparib, Rucaparib, and Talazoparib - poly(ADP-ribose) polymerase (PARP) inhibitors - using data from the U.S. Food and Drug Administration's Adverse Event Reporting System (FAERS) database, providing guidance for rational clinical use.