Multicenter investigations have delineated primary determinants of PTB, including body mass index (BMI), age, parity, blood pressure, multiple gestations, early onset of sexual activity, and previous PTB history [7] Additionally, factors such as prior wedge-shaped cervical biopsies shortened cervical length [5], cervical biomechanical properties, uterine fibroids and adenomyosis, and elevated fetal fibronectin concentrations [12] are also significant. Here, FN1 is linked to adenomyosis.