Interestingly, the highest risk of SGA and the lowest risk of LGA were observed among pregnant women with PE and an RBP4 level >40.0 mg/L, with ORs of 9.54 (95% CI, 5.76–15.81) and 0.25 (95% CI, 0.12–0.52), respectively, compared with those among NPC women with RBP4 levels ≤40.0 mg/L. This evidence concerns the gene RBP4 and nasopharyngeal carcinoma.