The burden of Cushing’s disease: clinical and health-related quality of life aspects

Posted on August 13, 2017 by MaryO


Thanks to Robin Ess for the easy to read chart!

Abstract

Objective Cushing’s disease (CD) is a rare endocrine disorder characterized by excess secretion of ACTH due to a pituitary adenoma. Current treatment options are limited and may pose additional risks. A literature review was conducted to assess the holistic burden of CD.

Design Studies published in English were evaluated to address questions regarding the epidemiology of CD, time to diagnosis, health-related quality of life (HRQoL), treatment outcomes, mortality, prevalence of comorbidities at diagnosis, and reversibility of comorbidities following the treatment.

Methods A two-stage literature search was performed in Medline, EMBASE, and Science Citation Index, using keywords related to the epidemiology, treatment, and outcomes of CD: i) articles published from 2000 to 2012 were identified and ii) an additional hand search (all years) was conducted on the basis of bibliography of identified articles.

Results At the time of diagnosis, 58–85% of patients have hypertension, 32–41% are obese, 20–47% have diabetes mellitus, 50–81% have major depression, 31–50% have osteoporosis, and 38–71% have dyslipidemia. Remission rates following transsphenoidal surgery (TSS) are high when performed by expert pituitary surgeons (rates of 65–90%), but the potential for relapse remains (rates of 5–36%). Although some complications can be partially reversed, time to reversal can take years. The HRQoL of patients with CD also remains severely compromised after remission.

Conclusions These findings highlight the significant burden associated with CD. As current treatment options may not fully reverse the burden of chronic hypercortisolism, there is a need for both improved diagnostic tools to reduce the time to diagnosis and effective therapy, particularly a targeted medical therapy.

Introduction

Cushing’s disease (CD) is a rare condition caused by a pituitary adenoma that secretes excess ACTH (1), which promotes excess cortisol production from the adrenal glands. Excess cortisol induces a clinical phenotype that harbors all components of the metabolic syndrome, such as central obesity, diabetes mellitus, dyslipidemia, and hypertension, as well as muscle weakness, hirsutism, increased bruisability, psychological dysfunction, and osteoporosis (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11).

Patients with CD experience a significant clinical burden due to comorbidities, increased mortality, and impaired health-related quality of life (HRQoL) due to prolonged exposure to elevated cortisol levels (3, 5, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20). In particular, patients with CD often experience severe fatigue and weakness, physical changes, emotional instability, depression, and cognitive impairments, which have a profound impact on daily life (13, 21).

Although there have been several consensus statements published recently on the definition of remission, diagnosis, and the management of CD, the severity and diversity of the clinical scenario and associated morbidities continue to present a management challenge (1, 22, 23). Additionally, there is recent evidence of persistent deleterious effects after remission, most notably persistent elevated cardiovascular risk (3, 22). The main objective of the current literature review is to describe the current burden of the disease and to summarize data on specific aspects of this burden, which underscores the need for improved diagnostic and therapeutic approaches.

Materials and methods

Available literature were evaluated to address questions regarding the epidemiology of CD, time to diagnosis, mortality, prevalence of comorbidities at diagnosis, reversibility of comorbidities after treatment (in particular, after disease remission), outcomes and complications of current treatment options, and HRQoL associated with CD and interventions.

The literature search was performed in Medline, EMBASE, and Science Citation Index, using keywords related to the epidemiology, treatment, and outcomes of CD. It was conducted in two stages: i) articles published between 2000 and 2012 were identified through a PubMed search using the following keywords: CD, incidence, prevalence, mortality, treatment, remission, cure, excess cortisol, outcomes, cost, QoL, morbidities, transsphenoidal surgery (TSS), adrenalectomy, radiotherapy, steroidogenesis inhibitors, ketoconazole, mitotane, aminoglutethimide, etomidate, metyrapone, pasireotide, and cortisol receptor antagonists; and ii) an additional hand search was conducted on the basis of the bibliographies of identified articles. All studies that provided data (regardless of publication year) related to these research questions were retained.

Definitions

Different criteria for defining the remission of hypercortisolism have been proposed, ranging from the occurrence of definitive or transient postoperative hypocortisolemia to the adequate suppression of cortisol after dexamethasone administration. According to a recent consensus statement (23), persistent postoperative morning serum cortisol levels of <2 μg/dl (∼50 nmol/l) are associated with remission and a low recurrence rate of ∼10% at 10 years. Persistent serum cortisol levels above 5 μg/dl (∼140 nmol/l) for up to 6 weeks following surgery require further evaluation. When serum cortisol levels are between 2 and 5 μg/dl, the patient can be considered in remission and can be observed without additional treatment for CD. A subset of patients can even develop complete adrenal insufficiency (serum cortisol levels below 2 μg/dl (∼50 nmol/l)) up to 12 weeks postsurgery (24, 25). Therefore, repeated evaluation in the early postoperative period is recommended. However, long-term follow-up is necessary for all patients because no single cortisol cutoff value excludes those who later experience disease recurrence, and up to 25% of patients develop a recurrent adenoma within 10 years after surgery (26, 27, 28).

Results

Incidence and prevalence of CD

Although epidemiologic data on CD are limited, several population-based studies indicate an incidence of 1.2–2.4 per million (14, 19) and the prevalence of diagnosed cases to be ∼39 per million population (14). Lindholm et al. (19) used the case definition as either the presence of a corticotroph adenoma or remission after neurosurgery, which yielded an estimated incidence rate of 1.2–1.7 per million per year. Etxabe & Vazquez (14) reported an incidence of 2.4 per million in Vizcaya, Spain. A large-scale retrospective survey carried out in New Zealand by Bolland et al. (29) found the approximate prevalence of all forms of Cushing’s syndrome (CS) (the majority of these cases were of pituitary origin) to be 79 per million and the incidence to be 1.8 per million per year. Differences in epidemiologic estimates may be attributable to varying case definitions (for instance, the study by Lindholm excluded cases in which the adenoma could not be localized or those that could not achieve remission from surgery), geographical differences, and temporal effects. The prevalence of CD may be underestimated due to unrecognized patients with mild symptoms and patients with a cyclic form of CD (30).

Time to diagnosis

Data on the time from onset of symptoms to diagnosis are also limited. In a prospective study by Flitsch et al. (31) of 48 patients with pituitary adenomas, including 19 who had ACTH-secreting adenomas causing CD, the reported time from onset of symptoms to diagnosis was 4.3 years. A study by Martinez Ruiz et al. (32), which was based on only four pediatric CD patients, reported the time between onset of symptoms and diagnosis as ranging from 2.5 to 5 years. Etxabe & Vazquez (14) estimated that the average time from onset of clinical symptoms to diagnosis in 49 CD patients was 45.8±2.7 months (6–144 months), thus 3.8 years. This is corroborated by the findings from a Belgian cross-sectional study on pituitary adenomas including CD, which estimated that patients experienced symptoms for an average of 45 months before diagnosis (33). However, the reliability and generalizability of these data are limited by small sample sizes and the retrospective nature of the studies. Indeed, the New Zealand data from Bolland et al. (29) report that on presentation, patients experienced symptoms for a median of 2.0 years (but ranging up to 20 years) before diagnosis. On the basis of data from the prospective European Registry on Cushing’s syndrome (ERCUSYN) (total number of patients=481, of whom 66% of patients had CD), median delay in diagnosis was 2 years (34).

Mortality in patients with CD

Mortality in patients with CD has been analyzed in several small studies, with overall rates reported as standardized mortality ratio (SMR) ranging from 1.7 to 4.8 (Table 1) (14, 15, 17, 19). In studies in which mortality was assessed among those in remission and those with persistent disease separately, patients with persistent hypercortisolemia consistently had the highest mortality risk (15, 19, 35, 36). In addition, TSS as a first-line treatment has been an important advance as high remission rates after initial surgery have been accompanied by mortality rates that mirror those observed in the general population (17, 35, 37). In a case series from the UK, it was found that the majority of deaths occurred before 1985, which was before TSS was employed as the routine first-line treatment at the center (36). In a recent retrospective study, 80 patients undergoing TSS for CD between 1988 and 2009 were evaluated, and long-term cure (defined as ongoing absence of hypercortisolism at last follow-up) was reported in 72% of patients. However, overall elevated mortality persisted in patients (SMR 3.17 (95% CI: 1.70–5.43)), including those who achieved ‘cure’ (SMR 2.47 (95% CI: 0.80–5.77)), although even higher mortality was seen in those with postoperative recurrence/persistent disease (SMR 4.12 (95% CI: 1.12–10.54) (38). Additionally, a nationwide, retrospective study in New Zealand reported significant persistently increased mortality both in macro- and microadenomas (SMR 3.5 (1.3–7.8) and 3.2 (2.0–4.8) respectively), despite long-term biochemical remission rates of 93 and 91% of patients, respectively (29).

Read more at http://m.eje-online.org/content/167/3/311.full

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Ectopic Cushing’s syndrome associated with thoracic tumors

Posted on July 3, 2017 by MaryO

Results of a retrospective review conducted in southern India demonstrate that ectopic Cushing’s syndrome occurred most commonly in association with thoracic tumors.

Researchers added that early control over hypercortisolemia was necessary to prevent metabolic complications and infections, both of which had the potential to be life-threatening.

“As compared to patients with pituitary-dependent Cushing’s syndrome, patients with [ectopic Cushing Syndrome] present with a rapid progression of symptoms,” Nihal Thomas, MD, MNAMS, DNB, FRACP, professor in the department of endocrinology, diabetes and metabolism at Christian Medical College, Vellore, India, and colleagues wrote. “It is also associated with typical features of proximal muscle weakness, severe hypokalaemic metabolic alkalosis, hyperpigmentation, edema, hypertension and glucose intolerance. Early diagnosis and localization of the ectopic source of [adrenocorticotrophic hormone] is crucial, because the treatment of choice in most of these patients is complete excision of the tumor. Localizing the source of excess ACTH continues to be a challenge in most patients.”

Thomas and colleagues reviewed the records of 21 patients treated at a tertiary care center in southern India from 2006 to 2015. The researchers documented patients’ clinical features, history and images from radiological findings and PET scans, as well as details of management, follow-up and outcomes. They also compared those with ectopic Cushing’s syndrome with 20 patients who had Cushing’s disease.

Median age was 34 years. Thomas and colleagues reported that one patient demonstrated “an occult source of ACTH.” The rest had a variety of tumors: bronchial carcinoid (n = 7), thymic carcinoid (n = 7), lung malignancies (n = 3), medullary thyroid carcinoma (n = 2) and pancreatic neuroendocrine tumor (n = 1).

At presentation, muscle weakness was the most common clinical feature (95%), followed by hyperpigmentation (90%), facial puffiness (76%), easy bruising (61%), edema (57%) and striae (52%). Slightly less than half (43%) showed extensive acne. Central obesity in ectopic Cushing’s syndrome was uncommon and occurred in 14% of patients (n = 3), according to Thomas and colleagues; however, it was more prevalent (n = 18) in those with Cushing’s disease.

Median cortisol at 8 a.m. was 55.5 mcg/dL, the researchers wrote, while median 8 a.m. ACTH was 207 pg/mL. The median 24-hour urinary free cortisol level was 2,484 mcg.

Compared with patients with Cushing’s disease, those with ectopic Cushing’s syndrome had “markedly higher” midnight cortisol and ACTH, as well as basal cortisol and ACTH.

During follow-up, more than half of patients (12 of 21) with ectopic Cushing’s syndrome developed life-threatening infections. Although nine patients received surgery for their tumors, only one patient achieved a complete cure during the study period, the researchers wrote.

“In our series, patients with [ectopic Cushing’s syndrome] have more profound hypokalemia, and hypercortisolemia with higher levels of ACTH,” Thomas and colleagues wrote. “The prognosis of patients with [ectopic Cushing’s syndrome] was dependent on tumor histology. The role of a timely adrenalectomy needs to be considered in patients with hypercortisolemia unresponsive to medical management, and in patients with metastatic or recurrent disease.” – by Andy Polhamus

Disclosure: Endocrine Today was unable to confirm any relevant financial disclosures.

From https://www.healio.com/endocrinology/adrenal/news/in-the-journals/%7Be42c81a5-fd5b-4313-9b2b-9bcbdec7f8ce%7D/ectopic-cushings-syndrome-associated-with-thoracic-tumors

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Cushing’s appears to begin its cardiovascular effects during childhood

Posted on May 6, 2017 by MaryO

ORLANDO – Cushing’s disease may begin to exert its harmful cardiovascular effects quite early, a small pediatric study has found.

Children as young as 6 years old with the disorder already may show signs of cardiovascular remodeling, with stiffer aortas and higher aortic pulse-wave velocity than do age-matched controls, Hailey Blain and Maya Lodish, MD, said at the annual meeting of the Endocrine Society.

“The study, which included 10 patients, is small, but we continue to add new patients,” said Dr. Lodish, director of the pediatric endocrinology fellowship program at the Eunice Kennedy Shriver National Institute of Child Health and Human Development. Ten more children are being added to the cohort now, and she and Ms. Blain, a former research fellow at NIH, intend to grow the group and follow patients longitudinally.

Cushing’s disease has long been linked with increased cardiovascular risk in adults, but the study by Dr. Lodish and Ms. Blain is one of the first to examine the link in children. Their findings suggest that early cardiovascular risk factor management should be a routine part of these patients’ care, Dr. Lodish said in an interview.

“It’s very important to make sure that there is recognition of the cardiovascular risk factors that go along with this disease. Elevated levels of cholesterol, hypertension, and other risk factors that are in these individuals should be ameliorated as soon as possible from an early age and, most importantly, physicians should be diagnosing and treating children early, once they are identified as having Cushing’s disease. And, given that we are not sure whether these changes are reversible, we need to make sure these children are followed very closely.”

Indeed, Dr. Lodish has reason to believe that the changes may be long lasting or even permanent.

“We are looking at these children longitudinally and have 3-year data on some patients already. We want to see if they return to normal pulse wave velocity after surgical cure, or whether this is permanent remodeling. There is an implication already that it may be in a subset of individuals,” she said, citing her own 2009 study on hypertension in pediatric Cushing’s patients. “We looked at blood pressure at presentation, after surgical cure, and 1 year later. A significant portion of the kids still had hypertension at 1 year. This leads us to wonder if they will continue to be at risk for cardiovascular morbidity as adults.”

Ms. Blaine, an undergraduate at Bowdoin College, Brunswick, Maine, worked on the study during a summer internship with Dr. Lodish and presented its results in a poster forum during meeting. She examined two indicators of cardiovascular remodeling – aortic pulse wave velocity and aortic distensibility – in 10 patients who were a mean of 13 years old. All of the children came to NIH for diagnosis and treatment of Cushing’s; as part of that, all underwent a cardiac MRI.

The patients had a mean 2.5-year history of Cushing’s disease Their mean midnight cortisol level was 18.8 mcg/dL and mean plasma adrenocorticotropic hormone level, 77.3 pg/mL. Five patients were taking antihypertensive medications. Low- and high-density lipoprotein levels were acceptable in all patients.

The cardiovascular measures were compared to an age-matched historical control group. In this comparison, patients had significantly higher pulse wave velocity compared with controls (mean 4 vs. 3.4 m/s). Pulse wave velocity positively correlated with both midnight plasma cortisol and 24-hour urinary free cortisol collections. In the three patients with long-term follow-up after surgical cure of Cushing’s, the pulse wave velocity did not improve, either at 6 months or 1 year after surgery. This finding echoes those of Dr. Lodish’s 2009 paper, suggesting that once cardiovascular remodeling sets in, the changes may be long lasting.

“The link between Cushing’s and cardiovascular remodeling is related to the other things that go along with the disease,” Dr. Lodish said. “The hypertension, the adiposity, and the high cholesterol all may contribute to arterial rigidity. It’s also thought to be due to an increase in connective tissue. The bioelastic function of the aorta may be affected by having Cushing’s.”

That connection also suggests that certain antihypertensives may be more beneficial to patients with Cushing’s disease, she added. “It might have an implication in what blood pressure drug you use. Angiotensin-converting enzyme inhibitors increase vascular distensibility and inhibit collagen formation and fibrosis. It is a pilot study and needs longitudinal follow up and additional patient accrual, however, finding signs of cardiovascular remodeling in young children with Cushing’s is intriguing and deserves further study.”

Neither Ms. Blain nor Dr. Lodish had any financial disclosures.

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Severe Trauma May Damage The Brain as Well as the Psyche

Posted on October 24, 2016 by MaryO

NOTE: This is only a portion of the article.  Read the entire post at http://www.nytimes.com/1995/08/01/science/severe-trauma-may-damage-the-brain-as-well-as-the-psyche.html?pagewanted=all

Cortisol is a major means the body uses, with adrenaline, to arouse itself so quickly; its action, for example, triggers an increase in blood pressure and mobilizes energy from fat tissue and the liver.

“The dark side of this picture is the neurological effects,” said Dr. Sapolsky. “It’s necessary for survival, but it can be disastrous if you secrete cortisol for months or years on end. We’ve known it could lead to stress-exacerbated diseases like hypertension or adult onset diabetes. But now we’re finding the hippocampus is also damaged by these secretions.”

Studies in animals show that when glucocorticoids are secreted at high levels for several hours or days, there is a detectable effect on memory, though no neuronal death. But with sustained release from repeated stress, “it eventually kills neurons in the hippocampus,” said Dr. Sapolsky. “This has been shown solidly in rats, with the cell biology well understood.”

A parallel effect has long been known among patients with Cushing’s disease, a hormonal condition in which tumors in the adrenal or pituitary glands or corticosteroid drugs used for a prolonged time cause the adrenal glands to secrete high levels of a hormone called ACTHm and of cortisol. Such patients are prone to a range of diseases “in any organ with stress sensitivity,” including diabetes, hypertension and suppression of the immune system, said Dr. Sapolsky.

Cushing’s patients also have pronounced memory problems, especially for facts like where a car was parked. “The hippocampus is essential for transferring such facts from short-term to long-term memory,” said Dr. Sapolsky.

In 1993, researchers at the University of Michigan reported that magnetic resonance imaging had shown an atrophy and shrinkage of the hippocampus in patients with Cushing’s disease; the higher their levels of cortisol, the more shrinkage.

In an apparent paradox, low levels of cortisol in post-trauma victims were found in a separate research report, also in the July issue of The American Journal of Psychiatry. Dr. Rachel Yehuda, a psychologist at Mount Sinai Medical School in New York City, found the lower levels of cortisol in Holocaust survivors who had been in concentration camps 50 years ago and who still had post-traumatic symptoms.

“There are mixed findings on cortisol levels in trauma victims, with some researchers finding very high levels and others finding very low levels,” said Dr. Sapolsky. “Biologically speaking, there may be different kinds of post-traumatic stress.”

In a series of studies, Dr. Yehuda has found that those post-trauma patients who have low cortisol levels also seem to have “a hypersensitivity in cell receptors for cortisol,” she said. To protect itself, the body seems to reset its cortisol levels at a lower point.

The low cortisol levels “seem paradoxical, but both too much and too little can be bad,” said Dr. Yehuda. “There are different kinds of cells in various regions of the hippocampus that react to cortisol. Some atrophy or die if there is too little cortisol, some if there is too much.”

Dr. Yehuda added, “In a brain scan, there’s no way to know exactly which cells have died.”

To be sure that the shrinkage found in the hippocampus of trauma victims is indeed because of the events they suffered through, researchers are now turning to prospective studies, where before-and-after brain images can be made of people who have not yet undergone trauma, but are at high risk, or who have undergone it so recently that cell death has not had time to occur.

Dr. Charney, for example, is planning to take M.R.I. scans of the brains of emergency workers like police officers and firefighters and hopes to do the same with young inner-city children, who are at very high risk of being traumatized over the course of childhood and adolescence. Dr. Pitman, with Dr. Yehuda, plans a similar study of trauma victims in Israel as they are being treated in emergency rooms.

Dr. Yehuda held out some hope for people who have suffered through traumatic events. “It’s not necessarily the case that if you’ve been traumatized your hippocampus is smaller,” she said. She cited research with rats by Dr. Bruce McEwen, a neuroscientist at Rockefeller University, showing that atrophied dendritic extensions to other cells in the hippocampus grew back when the rats were given drugs that blocked stress hormones.

Dr. Sapolsky cited similar results in patients with Cushing’s disease whose cortisol levels returned to normal after tumors were removed. “If the loss of hippocampal volume in trauma victims is due to the atrophy of dendrites rather than to cell death, then it is potentially reversible, or may be so one day,” he said.

NOTE: This is only a portion of the article.  Read the entire post at http://www.nytimes.com/1995/08/01/science/severe-trauma-may-damage-the-brain-as-well-as-the-psyche.html?pagewanted=all

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Screening tool accurately predicts Cushing’s syndrome in most at-risk patients

Posted on August 9, 2016 by MaryO

León-Justel A, et al. J Clin Endocrinol Metab. 2016;doi:10.1210/jc.2016-1673.

A scoring system based on clinical signs and a late-night salivary cortisol test accurately predicted Cushing’s syndrome in at-risk patients, with only one missed case, according to recent findings.

In a prospective, multicenter study, Antonio León-Justel, PhD, of the biochemistry department at the Hospital Universitario Virgen del Rocío in Seville, Spain, and colleagues analyzed data from 353 patients treated in endocrinology units in 13 university hospitals in Spain between 2012 and July 2013. All participants had at least two of five features compatible with Cushing’s syndrome, including obesity, hypertension, poorly controlled diabetes,hirsutism with menstrual disorders and osteoporosis; none of the included patients was referred to clinic with the suspicion of Cushing’s syndrome. All patients underwent late-night salivary cortisol and serum cortisol measurements after a low-dose (1 mg) dexamethasone test; those with discordant results were followed until December 2014 (mean follow-up time, 22.2 months).

Within the cohort, 26 (7.4%) patients were diagnosed with Cushing’s syndrome (20 adrenocorticotropic hormone-dependent; six of adrenal origin). In univariate logistic regression analysis, researchers found that muscular atrophy (OR = 15.2), followed by osteoporosis (OR = 4.6), dorsocervical fat pad (OR = 3.32), absence of obesity (OR = 0.21) and absence of type 2 diabetes (OR = 0.26), were associated with Cushing’s syndrome; late-night salivary cortisol values were also related (OR = 1.26). However, after multivariable adjustment, researchers found that muscular atrophy (OR = 9.04; 95% CI, 2.36-34.65), osteoporosis (OR = 3.62; 95% CI, 1.16-11.35) and dorsocervical fat (OR = 3.3; 95% CI, 1.52-7.17) remained as independent variables with Cushing’s syndrome.

“Obesity and type 2 diabetes displayed a negative association with [Cushing’s syndrome],” the researchers wrote. “These results might seem paradoxical a priori, but we want to stress that in our analyzed cohort, the prevalence of obesity and diabetes was exceedingly high (likely reflecting the reasons for referral to endocrinology units).”

In receiver operating characteristic (ROC) analysis, researchers determined that a cutoff value of 9.17 nmol/L for late-night salivary cortisol provided the best results, with an area under the curve of 0.893 (P < .001), a sensitivity of 88.5% and specificity of 83.2%.

Researchers developed a risk-scoring system, determining cutoff values from a ROC curve. The estimated area under the ROC curve was 0.93 (P < .001), with a sensitivity of 96.2% and specificity of 82.9%.

“Selecting this cutoff value of four, 271 of 327 subjects (83%) without [Cushing’s syndrome] were correctly identified, while only 1 of 26 [Cushing’s syndrome] cases was missed,” the researchers wrote. “Our model yielded 56 false positives.

“Although all the assessments were performed by specialists (endocrinologists) in our study, this scoring system could be easily tested in independent cohorts and different settings such as primary care or hypertension clinics,” the researchers wrote. “At the very least, our diagnostic prediction model could be used as a framework for future studies and potential improvements in diagnostic performance.” – by Regina Schaffer

Disclosure: Leon-Justel and another researcher report receiving a research grant from Novartis Oncology, Spain.

From http://www.healio.com/endocrinology/adrenal/news/in-the-journals/%7B50d3d398-c8fe-41e9-b815-87626bfe8a4b%7D/screening-tool-accurately-predicts-cushings-syndrome-in-most-at-risk-patients

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