Dopamine Agonists Withdrawal Study of Invasive Prolactinomas Involving the Cavernous Sinus

Study Overview
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Brief Summary
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The purpose of this study is to observe whether dopamine agonists can be safely withdrawn after the tumor volume and prolactin level of invasive prolactinomas involving the cavernous sinus have been effectively controlled through pharmacological treatment.

Detailed Description
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For giant or large invasive prolactinomas involving the cavernous sinus, whether the drug can be safely withdrawn after the tumor volume and prolactin(PRL) level have been effectively controlled through pharmacological treatment still remains unknown. The study objects are patients with invasive prolactinomas involving the cavernous sinus, which were invaded the cavernous sinus to an extent corresponding to Grade III or IV, according to the classification scheme of Knosp and colleagues, who had undergone pharmacological treatment including bromocriptine or cabergoline. Observation will be started after drug withdrawal criteria are reached (PRL remains normal level for no less than two years; tumor volume has shrank more than 50%, and the distance is more than 5mm between tumor and optical nerve),the patients are randomized to withdrawal group or continue treatment group.Observational items include changes of PRL level, tumor volume as well as vision acuity and visual fields. If elevated PRL or tumor relapse is observed, pharmacological treatment will be restarted.

Official Title
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Dopamine Agonists Withdrawal Study of Invasive Prolactinomas Involving the Cavernous Sinus

Conditions
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Invasive Prolactinomas Involving the Cavernous Sinus

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Aged between 15 and 70 years old, either sex; Karnofsky performance status ≥ 70; Patients who were suffered Invasive prolactinomas involving the cavernous sinus , referring to ①Serum prolactin level>200ng/ml, or >4000mIU/L;②enhanced Magnetic Resonance images confirm tumor invasion into cavernous sinus, i.e. Knosp grade Ⅲ or Ⅳ, and were treated by dopamine agonists treatment; PRL remains normal level for no less than two years; Tumor volume has shrank more than 50%, and the distance is more than 5mm between tumor and optical nerve; The patient has signed the informed consent. Exclusion Criteria: Patients concomitantly taking the psychotropic drugs or other drugs causing elevated PRL ; Patients with parkinson disease and is taking dopaminergic agents; Patients with prolactinoma who received Gamma knife treatment; Patients who use any dopamine receptor agonists other than bromocriptine and cabergoline; Patients taking the other prolactinomas simultaneously; pregnant or lactating women, or women preparing pregnant; Patients with poor compliance, who cannot implement the program strictly.

Ages Eligible for Study
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Minimum Age: 15 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Withdrawal group<br>Withdrawal observation after reaching the withdrawal standard | |
| Continue treatment group<br>Continue treatment obsevation after reaching the withdrawal standard | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from baseline on PRL level | Record the result of PRL on every 3 month follow-up visit | Up to 2 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from baseline on tumor volume measured by enhanced pituitary Magnetic Resonance Imaging（MRI） | Record the tumor volume from enhanced pituitary MRI on every 3 month follow-up visits | Up to 2 years | 
| Change from baseline of visual acuity | Record the Visual acuity on every 3 month follow-up visit | Up to 2 years | 
| Change from baseline on 5 point visual field scale | Record the Visual field scale on every 3 month follow-up visit, 0 = normal, no vision loss; 1 = one quadrant vision loss; 2 = two quadrants of vision loss; 3 = three quadrants of vision loss; 4 = four quadrants of vision loss but retain a central tubular vision; 5 = blind | Up to 2 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Prolactinoma, dopamine agonist, withdrawal, cavernous sinus