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Macroprolactinomas are rarely seen in women, and pregnancy is a risk factor for tumor growth. More studies are needed to determine appropriate management for macroprolactinoma and pregnancy. The aim of our study is to evaluate effects of treatment with dopamine agonists on macroadenoma before and during pregnancy, safety of dopamine agonists on fetus, post-pregnancy prognosis and long-term results. This is a single center retrospective study. Thirty-four pregnancies occurred in 21 patients under medical therapy. Prolactin levels, treatment results, tumor diameter changes, maternal-fetal outcomes, and disease activity were evaluated. The median tumor size at the time of diagnosis was 15 mm (10–28). Residual adenoma diameter was smaller in those receiving medical therapy longer than one year till the conception (p=0.047). Treatment was discontinued in 28 pregnancies after pregnancy confirmation, and 6 patients were exposed to bromocriptine throughout pregnancy. There was no symptomatic tumor growth during gestation. Among 27 live births, none of the fetuses developed neonatal malformation except for a case of Down syndrome. While early remission rate after pregnancy was 9.5%, this rate reached 33.3% at last follow-up visit. Lowered PRL levels at postpartum period (p=0.040), smaller tumor size at last follow-up visit (p=0.030), and total disappearance of tumor (p=0.026) were the contributor factors for remission. Use of dopamine agonist over one year may reduce the risk of symptomatic tumor growth during pregnancy in patients without invasive or large macroprolactinoma before pregnancy. Exposure to dopamine agonists seems generally safe for the fetus.

Outcomes of Patients with Macroprolactinoma Desiring Pregnancy: Follow-Up to 23 Years from a Single Center