RESEARCH SUPPORT, N.I.H., EXTRAMURAL
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Recurrence of hyperprolactinemia after withdrawal of long-term cabergoline therapy.

CONTEXT: Recurrence of hyperprolactinemia after cabergoline withdrawal ranges widely from 36 to 80%. The Pituitary Society recommends withdrawal of cabergoline in selected patients.

OBJECTIVE: Our aim was to evaluate recurrence of hyperprolactinemia in patients meeting The Pituitary Society guidelines.

DESIGN: Patients were followed from the date of discontinuation to either relapse of hyperprolactinemia or the day of last prolactin test.

SETTING: We conducted the study at an academic medical center.

PATIENTS: Forty-six patients meeting Pituitary Society criteria (normoprolactinemic and with tumor volume reduction after 2 or more years of treatment) participated in the study.

INTERVENTIONS: After withdrawal, if prolactin returned above reference range, another measurement was obtained within 1 month, symptoms were assessed by questionnaire, and magnetic resonance imaging was performed.

MAIN OUTCOME MEASURES: We measured risk of and time to recurrence estimates as well as clinical predictors of recurrence.

RESULTS: Mean age of patients was 50 +/- 13 yr, and 70% were women. Thirty-one patients had microprolactinomas, 11 had macroprolactinomas, and four had nontumoral hyperprolactinemia. The overall recurrence was 54%, and the estimated risk of recurrence by 18 months was 63%. The median time to recurrence was 3 months (range, 1-18 months), with 91% of recurrences occurring within 1 yr after discontinuation. Size of tumor remnant prior to withdrawal predicted recurrence [18% increase in risk for each millimeter (95% confidence interval, 3-35; P = 0.017)]. None of the tumors enlarged in the patients experiencing recurrence, and 28% had symptoms of hypogonadism.

CONCLUSIONS: Cabergoline withdrawal is practical and safe in a subset of patients as defined by The Pituitary Society guidelines; however, the average risk of long-term recurrence in our study was over 60%. Close follow-up remains important, especially within the first year.

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