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Background/aim:  The aims of this study were to observe the interhormonal relationship of serum leptin with serum estradiol and to  compare pre- and postmenopausal women for possible implications in breast carcinogenesis.  Materials  and  methods:   This  comparative  case-control  study  encompasses  175  breast  cancer  patients  and  175  age-,  sex-,  and  BMI- matched healthy controls. For comparison, the subjects were divided into pre- and postmenopausal groups according to their menstrual  history. Blood samples were analyzed for serum leptin and serum estradiol by the ELISA method.  Results:  Higher mean values of serum estrogen and leptin were observed in breast cancer cases among both the pre- and postmenopausal  groups. While estimating the association of serum leptin with serum estradiol, a weak positive (r = 0.186) but statistically significant (P  = 0.022) correlation was found among the premenopausal subjects, while a moderate positive association (r = 0.556) was found among  the postmenopausal subjects, which had high statistical significance (P = 0.001). Furthermore, correlation coefficients (r) of the pre- and  postmenopausal groups were compared using Fisher r-to-z transformation and found to have a statistically significant difference (z =  4.03, P = 0.0001).  Conclusion:  The findings of this study suggest the mitogenic effects of leptin on mammary tissue via augmenting peripheral estrogen  production more significantly among postmenopausal subjects. Thus, the therapeutic modulation of leptin may be a potential adjuvant  treatment for breast cancer patients with high levels of leptin along with high estrogen concentration as a consequence.

turkish journal of medical sciences

Association of serum leptin with serum estradiol in relation to breast carcinogenesis: a comparative case-control study between pre- and postmenopausal women