Brief Research ReportPublished 22 September 2026MTHFR (rs1801133) and SERPINE1 /PAI-1 (−675 4G/5G) gene polymorphisms and their association with spontaneous abortion and missed pregnancy in an ethnic Uzbek population: a case–control studyFarkhod Akhmedov · Gulnoza Axmadjonova · Nigora Axmadaliyeva · Habibaxon Negmatshayeva · Saxibaxon Kasimova · Nigina NasimovaFrontiers in Reproductive Healthdoi 10.3389/frph.2026.1943185