Linear regression analysis indicated that, after controlling for age, menstrual phase, parity, presence or absence of adenomyosis, and presence or absence of uterine fibroids, the RAMP-1 and CRLR staining levels were still significantly higher in OE and DE lesions than that of normal endometrium (all p-values < 0.036, all R2 ≥ 0.34). Here, RAMP1 is linked to adenomyosis.