Pregnancy Loss, Recurrent 1, also known as pregnancy loss, recurrent, susceptibility to, 1, is related to antiphospholipid syndrome and thrombophilia due to activated protein c resistance. An important gene associated with Pregnancy Loss, Recurrent 1 is F5 (Coagulation Factor V). The drugs Nitric Oxide and Prednisone have been mentioned in the context of this disorder. Affiliated tissues include thyroid and nk cells.