FOXP3 and Miscarriage: Treg/CD4 Tconv cell proportions in human endometrium have not been previously clearly defined,32 there is limited evidence of increased FOXP3+ cells (immunohistochemical analysis) in the endometrium of RPL patients,33 but Tconv and Treg proportions and populations have mainly been studied in in the peripheral blood or decidua obtained after miscarriage.