Dataset Information

Ketoconazole- and Metyrapone-Induced Reductions on Urinary Steroid Metabolites Alter the Urinary Free Cortisol Immunoassay Reliability in Cushing Syndrome.

ABSTRACT:

Introduction

Twenty-four-hour urinary free cortisol (24h-UFC) is the most used test for follow-up decision-making in patients with Cushing syndrome (CS) under medical treatment. However, 24h-UFC determinations by immunoassays (IA) are commonly overestimated because of steroid metabolites' cross-reaction. It is still uncertain how ketoconazole (KTZ)- and metyrapone (MTP)-induced changes on the urinary steroid metabolites can alter the 24h-UFC*IA determinations' reliability.

Methods

24h-UFC was analyzed by IA and gas chromatography-mass spectrometry (GC-MS) in 193 samples (81 before treatment, 73 during KTZ, and 39 during MTP) from 34 CS patients. In addition, urinary steroidome was analyzed by GC-MS on each patient before and during treatment.

Results

Before treatment, 24h-UFC*IA determinations were overestimated by a factor of 1.75 (95% CI 1.60-1.94) compared to those by GC-MS. However, during KTZ treatment, 24h-UFC*IA results were similar (0.98:1) to those by GC-MS (95% CI, 0.83-1.20). In patients taking MTP, IA bias only decreased 0.55, resulting in persistence of an overestimation factor of 1.33:1 (95% CI, 1.09-1.76). High method agreement between GC-MS and IA before treatment (R ² = 0.954) declined in patients under KTZ (R ² = 0.632) but not in MTP (R ² = 0.917). Upper limit normal (ULN) reductions in patients taking KTZ were 27% larger when using 24h-UFC*IA compared to 24h-UFC*GC-MS, which resulted in higher false efficacy and misleading biochemical classification of 15% of patients. Urinary excretion changes of 22 urinary steroid metabolites explained 86% of the 24h-UFC*IA interference. Larger urinary excretion reductions of 6β-hydroxy-cortisol, 20α-dihydrocortisol, and 18-hydroxy-cortisol in patients with KTZ elucidated the higher 24h-UFC*IA bias decrement compared to MTP-treated patients.

Conclusion

KTZ and MTP alter the urinary excretion of IA cross-reactive steroid metabolites, thus decreasing the cross-reactive interference of 24h-UFC*IA determinations present before treatment. Consequently, this interference reduction in 24h-UFC*IA leads to loss of method agreement with GC-MS and high risk of overestimating the biochemical impact of KTZ and MTP in controlling CS because of poor reliability of reference ranges and ULN.

SUBMITTER: Vega-Beyhart A

PROVIDER: S-EPMC8905543 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Ketoconazole- and Metyrapone-Induced Reductions on Urinary Steroid Metabolites Alter the Urinary Free Cortisol Immunoassay Reliability in Cushing Syndrome.

Vega-Beyhart Arturo A Laguna-Moreno Javier J Díaz-Catalán Daniela D Boswell Laura L Mora Mireia M Halperin Irene I Casals Gregori G Hanzu Felicia A FA

Frontiers in endocrinology 20220223

<h4>Introduction</h4>Twenty-four-hour urinary free cortisol (24h-UFC) is the most used test for follow-up decision-making in patients with Cushing syndrome (CS) under medical treatment. However, 24h-UFC determinations by immunoassays (IA) are commonly overestimated because of steroid metabolites' cross-reaction. It is still uncertain how ketoconazole (KTZ)- and metyrapone (MTP)-induced changes on the urinary steroid metabolites can alter the 24h-UFC*IA determinations' reliability.<h4>Methods</h4 ...[more]

PMID: 35282465

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Project description:IntroductionPerinatal hypercorticism, regardless of its cause, has a high mortality or leads to life-long lasting complications. Some publications reported on the use of metyrapone in children with McCune Albright syndrome (MAS) and hypercorticism but also mentioned its poor tolerability.Case presentationWe present the case of a toddler in whom we diagnosed MAS based on pseudo-precocious puberty and hypercorticism at the age of 10 months. In light of hepatopathy, we decided to start the off-label treatment with metyrapone. Being aware of the challenges of this treatment with the only available product (gelatine capsule containing liquid metyrapone) and reports on local irritation and significant side effects after the oral and intrarectal administration of liquid metyrapone, diluted or undiluted, we decided to use the rectal application as suppositories. We started with the dose of 300 mg/m2/day (one administration every 6 h), with the intention to "block and replace," using repeated measurements of serum morning and 23:00 cortisol, salivary cortisol, and 24-h urine steroid profile. After just 2 weeks, we discharged our patient with normal cortisol levels, without additional hydrocortisone substitution and with a total metyrapone dose of 900 mg/m2/day. Lipid profile and arterial pressure normalized, while growth velocity improved progressively.ConclusionWe present the first successful, long-term use of metyrapone as suppositories, with no adverse side effects and striking clinical and biochemical improvement.IntroductionPerinatal hypercorticism, regardless of its cause, has a high mortality or leads to life-long lasting complications. Some publications reported on the use of metyrapone in children with McCune Albright syndrome (MAS) and hypercorticism but also mentioned its poor tolerability.Case presentationWe present the case of a toddler in whom we diagnosed MAS based on pseudo-precocious puberty and hypercorticism at the age of 10 months. In light of hepatopathy, we decided to start the off-label treatment with metyrapone. Being aware of the challenges of this treatment with the only available product (gelatine capsule containing liquid metyrapone) and reports on local irritation and significant side effects after the oral and intrarectal administration of liquid metyrapone, diluted or undiluted, we decided to use the rectal application as suppositories. We started with the dose of 300 mg/m2/day (one administration every 6 h), with the intention to "block and replace," using repeated measurements of serum morning and 23:00 cortisol, salivary cortisol, and 24-h urine steroid profile. After just 2 weeks, we discharged our patient with normal cortisol levels, without additional hydrocortisone substitution and with a total metyrapone dose of 900 mg/m2/day. Lipid profile and arterial pressure normalized, while growth velocity improved progressively.ConclusionWe present the first successful, long-term use of metyrapone as suppositories, with no adverse side effects and striking clinical and biochemical improvement.

Dataset Information

Ketoconazole- and Metyrapone-Induced Reductions on Urinary Steroid Metabolites Alter the Urinary Free Cortisol Immunoassay Reliability in Cushing Syndrome.

Introduction

Methods

Results

Conclusion

Publications

Ketoconazole- and Metyrapone-Induced Reductions on Urinary Steroid Metabolites Alter the Urinary Free Cortisol Immunoassay Reliability in Cushing Syndrome.

Similar Datasets

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