title: Evaluation of salivary cortisol measurements for the diagnosis of subclinical Cushing's syndrome.
abstract: Late-night salivary cortisol (NSC) has been recognized as a sensitive and easy-to-perform screening test for the diagnosis of overt Cushing's syndrome (CS).  However, there have been few reports on the diagnostic utility of salivary cortisol (SC) measurement in the diagnosis of subclinical Cushing's syndrome (SCS).  Therefore, the present study was designed to evaluate the usefulness of SC measurements at late-night and after overnight 1 mg dexamethasone suppression test (DST) for the diagnosis of SCS in 42 patients with adrenal incidentaloma.  We evaluated 16 patients with SCS, 12 with nonfunctioning adenoma (NFA), 8 with primary aldosteronism (PA), and 6 with pheochromocytoma (Pheo).  NSC levels in SCS patients (0.238 ± 0.106 µg/dL) were significantly (P < 0.05) higher than those in NFA patients (0.154 ± 0.104 µg/dL); the cutoff value (0.11 µg/dL) by ROC analysis gave high sensitivity (100%) with low specificity (50%).  Post DST SC levels in SCS patients (0.238 ± 0.116 µg/dL) were significantly (P = 0.0081) higher than those in NFA patients (0.136 ± 0.110 µg/dL); the cutoff value (0.12 µg/dL) by ROC analysis gave high sensitivity (93.8%) with somewhat improved specificity (58.3%).  Both NSC and post DST SC levels were comparable between NFA, PA, and Pheo patients.  In conclusion, our study revealed that measurements of NSC and/or post DST SC among patients with adrenal incidentaloma prove to have high sensitivities, but low specificities for the diagnosis of SCS from NFA, suggesting its possible alternative option before the screening tests for SCS currently employed in Japan.
authors.affiliation: Department of Clinical and Molecular Endocrinology, Tokyo Medical and Dental University Graduate School, Tokyo 113-8519, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Tateishi
authors.forename: Ryuji
authors.initials: R
authors.lastname: Kouyama
authors.forename: Masatomo
authors.initials: M
authors.lastname: Mihara
authors.forename: Masaru
authors.initials: M
authors.lastname: Doi
authors.forename: Takanobu
authors.initials: T
authors.lastname: Yoshimoto
authors.forename: Yukio
authors.initials: Y
authors.lastname: Hirata
mesh_terms: D000236:Adenoma / Q000175:diagnosis; D000310:Adrenal Gland Neoplasms / Q000175:diagnosis*; D000328:Adult; D000368:Aged; D002940:Circadian Rhythm; D003480:Cushing Syndrome / Q000175:diagnosis*; D003907:Dexamethasone; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000032:analysis*; D006929:Hyperaldosteronism / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D010673:Pheochromocytoma / Q000175:diagnosis; D012372:ROC Curve; D012463:Saliva / Q000737:chemistry*; D012680:Sensitivity and Specificity
chemical_list: D003907:Dexamethasone; D006854:Hydrocortisone