<prompt> Schwangerschafts protein 1 SP1, is a biochemical marker of-Gestatinal trophoblastic diseaseEctopic pregnancyPlacenta accretaSevere PIH  <response>: Schwangerschafts protein 1 SP1, also known as pregnancy-associated plasma protein C PAPP-C or pregnancy-specific b-glycoprotein PSBS, is produced by the syncytiotrophoblast . It is a biochemical marker of Ectopic pregnancy 