text: Research on paracrine signaling through the JAK-STAT pathway revealed its potential in activating invasive behavior of ovarian epithelial cells. This epithelial to mesenchymal transition is highly evident in metastasis. Paracrine signaling through the JAK-STAT pathway is necessary in the transition from stationary epithelial cells to mobile mesenchymal cells, which are capable of invading surrounding tissue. Only the JAK-STAT pathway has been found to induce migratory cells.