Does a normal urine free cortisol result rule out Cushing’s syndrome?

Posted on March 7, 2015 by MaryO

ENDO_2015

 

March 07, 2015

SAT 379-412-Cushing’s Syndrome

Does a normal urine free cortisol result rule out Cushing’s syndrome?

ST Sharma, LK Nieman

Summary: Researchers conducted this study to assess the diagnostic accuarcy of urine free cortisol (UFC) and 24-hour urine 17-hydroxycorticosteroids (170HCS) in patients with Cushing’s syndrome, concluding that in patients with mild CS, UFC can be falsely normal or only minimally elevated. Further, they found that to help in making a diagnosis and prevent treatment delays, clinicians may consider incorporating multiple collections and use of complimentary screening tests including 24-hour urine 17OHCS and late night salivary cortisol (LNSC) testing.

Methods:

  • For this retrospective study, researchers included all CS patients evaluated at the National Institutes of Health (NIH) from 2009 to 2014.
  • The screening tests used for CS included UFC, 17OHCS, midnight serum cortisol and low dose (1 mg overnight or 2-day 2 mg/day) dexamethasone suppression test (DST).
  • They defined abnormal as values above reference range for UFC, 17OHCS and LNSC, a midnight serum cortisol ≥7.5 mcg/dL, and post-dexamethasone cortisol values ≥1.8 mcg/dL.
  • Hourly 24-hour sampling for cortisol was performed in a few cases with a mild clinical phenotype and equivocal test results.
  • Researchers measured UFC using liquid chromatography/tandem mass spectrometry (LC-MS/MS), and 17OHCS was measured using colorimetric methodology with Porter-Silber reaction (reported as mg/g of creatinine).
  • For this study, they used the mean of the first two UFC and 17OHCS values (appropriate collection by urine volume and creatinine) obtained within 30 days of initial NIH presentation.

Results:

  • In all, 72 patients were diagnosed with CS (aged 18-77 years, 51 females), 51 of whom had CD, 10 had ectopic CS, and 2 had an adrenal source of Cushing’s based on pathology.
  • Biochemical tests such as inferior petrosal sinus sampling (IPSS) suggested ectopic CS, but no tumor was found (occult) in 6 patients.
  • In 2 patients with failed transsphenoidal surgery, IPSS was indicative of a pituitary source, and one patient did not complete evaluation for ACTH-dependent CS.
  • UFC results were available in all patients, 17OHCS in 70, LNSC in 21, midnight serum cortisol in 68, and DST results in 37 patients.
  • UFC was falsely normal in 6 patients and only minimally elevated (<2 x ULN) in 13 patients (normal renal function, no history of cyclicity, all had CD); of these 19 patients, 24-hour 17OHCS was abnormal in all, LNSC was abnormal in 12, midnight serum cortisol was abnormal in 18, and DST was abnormal in 12 patients.
  • Hourly 24-hour sampling for cortisol performed in 3 of these patients revealed abnormal nadir (>7.5 mcg/dL) and mean daily serum cortisol (>9 mcg/dL) levels.

From http://www.mdlinx.com/endocrinology/conference-abstract.cfm/ZZ5BA369FDE9DE4CED82CB6A7CD5BFD1BE/42581/?utm_source=confcoveragenl&utm_medium=newsletter&utm_content=abstract-list&utm_campaign=abstract-ENDO2015&nonus=0

Filed under: Clinical trials, Cushing's, Meetings and Conferences, pituitary, Treatments | Tagged: , , , , , , , , , , , | Leave a comment »

Rare neuroendocrine tumours may be misdiagnosed as Cushing’s disease

Posted on October 31, 2014 by MaryO

By Eleanor McDermid, Senior medwireNews Reporter

Ectopic tumours secreting corticotropin-releasing hormone (CRH) and adrenocorticotropic hormone (ACTH) are very rare in children and can result in a misdiagnosis of Cushing’s disease (CD), say researchers.

Three of the patients in the reported case series had pituitary hyperplasia and underwent transsphenoidal surgery for apparent CD before the tumour that was actually causing their symptoms was located. The hyperplasia was probably caused by release of CRH from the ectopic tumour, which stimulated the pituitary gland, giving the impression of an ACTH-secreting pituitary adenoma, explain Maya Lodish (National Institutes of Health, Bethesda, Maryland, USA) and study co-authors.

These three patients were part of a series of seven, which Lodish et al describe as “a relatively large number of patients, considering the infrequency of this disease.”

The patients were aged between 1.8 and 21.3 years. Three had neuroendocrine tumours located in the pancreas ranging in size from 1.4 to 7.0 cm, two had thymic carcinoids ranging from 6.0 mm to 11.5 cm, one patient had a 12.0 cm tumour in the liver and one had a 1.3 cm bronchogenic carcinoid tumour of the right pulmonary lobe.

Four of the patients had metastatic disease and, during up to 57 months of follow-up, three died of metastatic disease or associated complications and two patients had recurrent disease.

“Our series demonstrates that these are aggressive tumors with a high mortality rate,” write the researchers in the Journal of Clinical Endocrinology & Metabolism. “It is important to follow the appropriate work up, regarding both biochemical and imaging tests, which can lead to the correct diagnosis and to the most beneficial therapeutic approach.”

The team found the CRH stimulation test to be helpful, noting, for example, that none of the patients had a rise in cortisol that was consistent with CD, with all patients showing smaller responses ranging from 2% to 15%. Likewise, just one patient had an ACTH rise higher than 35% on CRH administration, and four patients had a “flat” response, which has previously been associated with ectopic neuroendocrine tumours.

Of note, six patients had normal or high plasma CRH levels, despite all having high cortisol levels, which would be expected to result in undetectable plasma CRH due to negative feedback, implying another source of CRH production. Five patients had blunted diurnal variation of both cortisol and ACTH levels consistent with Cushing’s syndrome.

The patients also underwent a variety of imaging procedures to identify the source of ACTH/CRH production, some of which, such as octreotide scans, are specialist and not available in most hospitals, the researchers note, potentially contributing to inappropriate diagnosis and management.

From http://www.news-medical.net/news/20141030/Rare-neuroendocrine-tumours-may-be-misdiagnosed-as-Cushinge28099s-disease.aspx

Filed under: Cushing's, pituitary, Rare Diseases | Tagged: , , , , , , , , , , , , , , , , , , , , , | Leave a comment »

Use late-night salivary cortisol to catch recurrent Cushing’s

Posted on July 4, 2014 by MaryO

By: M. ALEXANDER OTTO, Clinical Endocrinology News Digital Network

JULY 3, 2014

AT ICE/ENDO 2014

CHICAGO – Late-night salivary cortisol exceeded normal limits in 10 women with recurrent Cushing’s disease a mean of 3.5 years after transsphenoidal surgery, but their urinary free cortisol remained in normal limits, according to a retrospective review from the Medical College of Wisconsin, Milwaukee.

That adds strength to the notion that late-night salivary cortisol (LNSC) catches recurrent Cushing’s that’s missed by urinary free cortisol, even though UFC remains a standard screening approach in some places.

The study is tiny and retrospective, but at the joint meeting of the International Congress of Endocrinology and the Endocrine Society, lead investigator Dr. Ty Carroll explained why the findings still matter, and also why two LNSC measurements are better than one.

Video: http://www.clinicalendocrinologynews.com/home/article/video-use-late-night-salivary-cortisol-to-catch-recurrent-cushings/d7fad98e9289f9402034e73455b7560c.html

Filed under: Clinical trials, Cushing's, Meetings and Conferences, pituitary, Rare Diseases | Tagged: , , , , , , , , , , , , , , | Leave a comment »

Long-term remission and recurrence rate in a cohort of Cushing’s disease: the need for long-term follow-up

Posted on June 9, 2014 by MaryO

Pituitary. 2014 Apr 19. [Epub ahead of print]


Aranda G1, Enseñat J, Mora M, Puig-Domingo M, Martínez de Osaba MJ, Casals G, Verger E, Ribalta MT, Hanzu FA, Halperin I.

Author information

 Abstract

OBJECTIVE:

Transsphenoidal surgery is the procedure of choice in Cushing disease (CD), with immediate post-operative remission rates ranging between 59 and 94 % and recurrence rates between 3 and 46 %, both depending upon the definition criteria and the duration of the follow-up. Our aim was to assess the rate of remission, recurrence and persistence of the disease after the first treatment and to identify predictors of remission in the CD population of our center.

METHODS:

Retrospective cohort study of the patients diagnosed of CD and with follow-up in our center between 1974 and 2011. We analyzed 41 patients (35 women and 6 men) with a mean age at diagnosis of 34 ± 13 years. The mean follow-up was 14 ± 10 years (range 1-37 years) and the median of follow-up period was 6.68 years.

RESULTS:

Thirty-five (85.4 %) patients underwent transsphenoidal surgery as first treatment option. Histopathological evidence of a pituitary adenoma was registered in 17 (48.5 %) patients. Thirty-two (78 %) patients achieved disease remission after the first treatment, 21 (65.6 %) of them presented disease recurrence. Persistent disease was observed in 9 (22 %) patients. Twelve (29.3 %) subjects developed post-surgical adrenal insufficiency, 7 of which (70 %) achieved stable remission. Two parameters were found to be significant predictors of remission after the first treatment: age at disease diagnosis and the development of adrenal insufficiency (cortisol ❤ μg/dl) in the immediate post-operative state.

CONCLUSIONS:

We report a high recurrence rate, at least partially attributable to the long follow-up time. Early post-surgery adrenal insufficiency predicts remission. Hypopituitarism was also very prevalent, and strongly associated with radiotherapy. These results lead us to the conclusion that CD needs a life-long strict follow-up.

PMID:

 

24748528

 

[PubMed – as supplied by publisher]

Filed under: adrenal crisis, Cushing's, pituitary, Treatments | Tagged: , , , , , , , , , | Leave a comment »

Interview May 7 with Kathy C, Pituitary Patient

Posted on May 6, 2014 by MaryO

My name is Kathy Casey. I am a 63 year old retired school nurse. I am married with two wonderful sons and a grandson. My husband and I live in the mountain town of Mt. Shasta in northern California. I have always been athletic.

In 1995, I was diagnosed with a pituitary tumor. At the time the only symptom I was aware of was a severe headache. I had a transphenoidal resection by Dr. Wilson at UCSF Medical Center followed by radiation therapy for 23 days. At the time they said they could not remove all of the tumor.

In 2008/2009. I exhibited symptoms of Cushing’s and my cortisol level was outrageous, and I had to be hospitalized initially for a potassium level of 2. I returned to UCSF and Dr. Anwar Sandeep operated . By removing part of the tumor. My Cushing symptoms resolved. However, he said that the tumor was not encapsulated and was invading the cavernous sinus and stella turcica so it was still not possible to remove it all.

I was OK until December 2013 when I began exhibiting the symptoms of Cushings. One of my 24 hr. urines was 14,000. I had to be hospitalized for a potassium level of 1.9. Dr. Heaney said he has never seen a cortisol level that high. This time I decided to go to the UCLA Pituitary Tumor and Endocrinology Program where they were more oriented to follow-up and treating this disorder. Dr. Bergsneider decided that surgery was not an option. He and Dr. Heaney decided radiation was not an option. So now I am being followed by Dr. Heaney to see if medication can help.

I am now on Cabergoline 0.5 mg three tabs twice a week and Signifor 0.9 mg subcutaneosly twice a day. I think they are alleviating some of the symptoms. However, the Signifor caused my blood sugar to rise, and I had to go on Metformin which is causing nausea to a point where I have a hard time eating.

Anyway, this whole situation is depressing and overwhelming. I am tryng to stay positive, but I wonder how it will turn out. I am fortunate to have a supportive and helpful husband.

I am interested in communicating with people who may be going through a similar experience and learning more about this rare condition.

Kathy will be interviewed May 7, 2014 in BlogTalkRadio

HOME | Contents | Adrenal Crisis! | Abbreviations | Glossary | Forums | Donate | Bios | Add Your Bio

Filed under: Cushing's, Interview, pituitary, podcast, Treatments | Tagged: , , , , , , , , , , , , , , , , , , , | Leave a comment »

« Previous Page — Next Page »