Fig. 7: TGF-β1 and VEGF protein levels are increased in the follicular fluid of patients with OHSS.

a, b TGF-β1 (a) and VEGF (b) protein levels in the follicular fluid of patients without OHSS (n = 30) and with OHSS (n = 30) were examined by ELISA. The results are expressed as the mean ± SD. The values without a common letter are significantly different (p < 0.05). c Pearson’s correlation analysis was performed to examine the correlation coefficient between two values. TGF-β1 protein levels were positively correlated with VEGF protein levels in the follicular fluid of patients with OHSS (n = 30).