Complete hydatidiform moles (CHM), a post-conceptual pathologic condition of the placenta, have a high prevalence rate (12/1,000 deliveries) in Kerala, India. This study addresses the expression of IL-1 alpha and beta by immunohistochemistry in relation to persistence and invasion of the disease. Mild to moderate expression of IL-1 alpha in the villous cytotrophoblasts, syncytiotrophoblasts and decidua of the first trimester in the normal placenta and all gestational ages in the molar placenta were observed. IL-1 beta expression was observed in the extravillous trophoblasts, syncytiotrophoblasts and decidua in both the normal and molar placentae and also in the villous cytotrophoblasts and the stromal Haufbaur cells in molar placentae. Strong expression of IL-1 beta in the placenta suggests its involvement in placental physiology supporting earlier reports. Higher expression of IL-1 beta correlated well with the invasive and persistent nature of the tumour and holds potential as a marker of persistence and invasion in CHM.
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