Glucocorticoids/antagonists & inhibitors; Hormone Antagonists/adverse effects; Hormone Antagonists/pharmacology; Mifepristone/adverse effects; Mifepristone/pharmacology; Progestins/antagonists & inhibitors; Binding, Competitive; Dexamethasone/antagonists & inhibitors; Drug Resistance; Estrenes/adverse effects; Estrenes/metabolism; Estrenes/pharmacology; Furans/adverse effects; Furans/metabolism; Furans/pharmacology; Gonanes/adverse effects; Gonanes/metabolism; Gonanes/pharmacology; Hormone Antagonists/metabolism; Humans; Hydrocortisone/blood; In Vitro Techniques; Lymphocyte Activation/drug effects; Meningeal Neoplasms/drug therapy; Meningeal Neoplasms/metabolism; Meningioma/drug therapy; Meningioma/metabolism; Mifepristone/metabolism; Receptors, Glucocorticoid/drug effects; Receptors, Glucocorticoid/metabolism