VEGFA and adenomyosis: In the myometrium, the expression pattern for the VEGFR1 gene was similar to that of VEGFA, and it was increased in stage 3–4 adenomyosis as compared with stage 1–2 (P < 0.05, Fig. 3d), although this difference was not significant when comparing both stages to control tissues (P > 0.05, Fig. 3d).