Purpose: Insulin and glucose pathways play a key role to fetal viability and growth. The focus of the study is to investigate the potential differences of immunohistochemical expression of IR in trophoblastic and decidual cells between women who had recurrent pregnancy loss and women that underwent an abortion. Materials and methods: Trophoblastic and decidual tissues from fifty (50) women with elective abortion used as control group and from fifty (50) women with recurrent miscarriages were collected during gestational weeks 6 to 12. IR antibodies were used as immunohistochemical staining markers. Nuclear and cytoplasmic expression was evaluated. Results: No IR immunohistochemical expression was detected in both trophoblastic cells of the implantation site and deciduas basalis of the two study groups. Conclusion: The effort made to enhance our knowledge on the physiology and histology of IR expression in connection with pregnancy was halted because the results were inconclusive. While studying, though, the correlation of recurrent miscarriage with IR expression, it became evident that a lot of hormones and pathways form the weave of gestational pathology and its delicate harmony. Every piece of knowledge may clarify this still obscure field
