Mohamed M. Aboelnaga, Nahed Abdullah and Mostafa El Shaer Pages 219 - 225 ( 7 )
Objective: The present research explored the relationship of vitamin D status with prolactin levels and adenoma size in female patients with newly diagnosed prolactinoma and determination of hypovitaminosis D prevalence among female patients with prolactinoma.
Patients and Methods: We enrolled 67 female patients with newly diagnosed prolactinoma (41 with micro adenoma and 26 with macro adenoma) in this case-control study at the time of presentation. We selected 45 female subjects as a control group who were matched according to age, weight, height, body mass index and waist circumference. We investigated 25-hydroxyvitamin D, the major circulating form of vitamin D.
Results: Prolactinoma patients had significantly lower 25-hydroxyvitamin D levels in comparison with control subjects. Also, macroadenoma patients showed significantly lower 25-hydroxyvitamin D levels as compared to microadenomoa patients. By contrast, microadenoma patients had nonsignificant lower 25-hydroxyvitamin D levels in comparison with control subjects. Furthermore, we found prolactinoma patients with 25-hydroxyvitamin D >20.00 ng/ml showing significant differences in the prolactin levels and adenoma size when compared with those who had 25- hydroxyvitamin D <20.00 ng/ml. In regression analysis, 25-hydroxyvitamin D level was a significant predictor of adenoma size in patients diagnosed with prolactinoma.
Conclusion: Female patients with prolactinoma have lower vitamin D levels and have higher prevalence of vitamin D insufficiency and deficiency among prolactinoma patients when compared with normal subjects. Also vitamin D deficiency in prolactinoma patients associated with larger adenoma size and higher prolactin level. Finally, 25-hydroxyvitamin D level was a statistically significant predictor of prolactinoma size but not prolactin levels.
Prolactinoma, prolactin, vitamin D, female, adenoma, pituitary tumors.
Department of Endocrinology, Faculty of Medicine, Mansoura University, Mansoura, Department of Physiology at Specialized Medical Hospital, Mansoura University, Mansoura, Department of Microbiology at Specialized Medical Hospital, Mansoura University, Mansoura