NFKB1 and fetal growth restriction: miR-26a-5p, which regulates uterine epithelial remodeling and immune signaling during implantation, is also dysregulated in pregnancy complications such as placenta previa and IUGR, and modulates inflammation and oxidative stress via NF-κB and cytokine pathways in other disease contexts, supporting its potential role as a pregnancy-relevant immune regulator (Hromadnikova et al., 2015; Myszczynski et al., 2025; Hromadnikova et al., 2024; Bian et al., 2024).