Primary Bilateral Macronodular Adrenal Hyperplasia Research Articles

Primary bilateral macronodular adrenal hyperplasia: A rare case report of Cushing syndrome and review of literature.

Primary bilateral macronodular adrenal hyperplasia (PBMAH) is a rare cause of ACTH-independent Cushing syndrome (CS), accounting for <2% of CS cases. Diagnosing PBMAH can be difficult and challenging for clinicians. We report a 52-year-old female, a patient with a history of intermittent fever for 3 years. She presented with nausea, headache, and dizziness for several days, along with fatigue, myalgia, muscle weakness, exertional dyspnea, hoarseness, spontaneous bruising over the past several months, and long-term psychological complaints. Additionally, we observed periorbital and facial edema, right lower quadrant tenderness, and abdominal striae during the examination. Her laboratory results showed increased cortisol and suppressed ACTH, and an abdominal CT scan revealed 2 heterogeneous masses in the adrenal glands. These findings led us to the diagnosis of PBMAH in this patient. The existence of aberrant receptors was evaluated, and the tests were negative. The patient underwent left adrenalectomy and corticosteroid therapy after the surgery. Her clinical complaints improved after the surgery. However, her dependency on corticosteroids was not transient after unilateral adrenalectomy, and she still needs glucocorticoid supplementation 1 year after surgery. This patient is a case of PBMAH who presented with fever and CS symptoms and underwent unilateral adrenalectomy. Interestingly, she had suppressed cortisol levels for at least 1 year after the unilateral adrenalectomy. Therefore, we suggest further research on the most effective treatment strategies for PBMAH.

The molecular genetics of adrenal cushing.

Adrenal Cushing represents 20% of cases of endogenous hypercorticism. Unilateral cortisol-producing adenoma (CPA), a benign tumor, and adrenocortical carcinoma (ACC), a malignant tumor, are more frequent than bilateral adrenal nodular diseases (primary bilateral macronodular adrenal hyperplasia (PBMAH) and primary pigmented nodular adrenal disease (PPNAD)).In cortisol-producing adrenal tumors, the signaling pathways mainly altered are the protein kinase A and Wnt/β-catenin pathways. Studying components of these pathways and exploring syndromic and familial cases of these tumors has historically enabled identification of many of the predisposing genes. More recently, pangenomic sequencing revealed alterations in sporadic tumors.In ACC, mainly due to TP53 alterations causing Li-Fraumeni syndrome, germline predisposition is frequent in children, while it is rare in adults. Pathogenic variants in the DNA mismatch repair genes MLH1, MSH2, MSH6, and PMS2, which cause Lynch syndrome or alterations of IGF2 and CDKN1C (11p15 locus) in Beckwith-Wiedemann syndrome, can also cause ACC. Rarely, ACC is described in other hereditary tumor syndromes due to germline pathogenic variants in MEN1 or APC and, in very rare cases, NF1, SDH, PRKAR1A, or BRCA2. Concerning ACC somatic alterations, TP53 and genetic or epigenetic alterations at the 11p15 locus are also frequently described, as well as CTNNB1 and ZNRF3 pathogenic variants.CPAs mainly harbor somatic pathogenic variants in PRKACA and CTNNB1 and, less frequently, PRKAR1A, PRKACB, or GNAS1 pathogenic variants. Isolated PBMAH is due to ARMC5 inactivating pathogenic variants in 20 to 25% of cases and to KDM1A pathogenic variants in food-dependent Cushing. Syndromic PBMAH may be due to germline pathogenic variants in MEN1, APC, or FH, causing type 1 multiple endocrine neoplasia, familial adenomatous polyposis, or hereditary leiomyomatosis-kidney cancer syndrome, respectively. PRKAR1A germline pathogenic variants are the main alteration causing PPNAD (isolated or part of Carney complex).

Long-term outcome of unilateral adrenalectomy for primary bilateral macronodular adrenal hyperplasia.

Primary bilateral macronodular adrenal hyperplasia (PBMAH) is a form of Cushing's syndrome (CS) characterized by heterogeneous cortisol secretion and clinical comorbidities. Previously, bilateral adrenalectomy was the standard treatment for PBMAH, but this approach carried a high risk of primary adrenocortical insufficiency. In recent decades, unilateral adrenalectomy (U-Adx) has emerged as an effective alternative. However, limited research exists on its postoperative efficacy and prognostic predictors. Therefore, the present study aimed to investigate the long-term effectiveness and prognostic predictors of U-Adx in treating PBMAH. A total of 61 patients with PBMAH diagnosis who underwent U-Adx at a single center between 2004 and 2022 were retrospectively evaluated. Patients were categorized into persistent hypercortisolism and remission groups based on postoperative biochemical outcomes at the last follow-up (>12 months after U-Adx). Clinical characteristics, comorbidities, plasma adrenocorticotropic hormone (ACTH), serum cortisol, and 24-h urinary-free cortisol (24-h UFC) levels were analyzed pre- and postoperatively. We further examined whether baseline plasma ACTH, serum cortisol, 24-h UFC levels, and the inhibition of cortisol and 24-h UFC after a low-dose dexamethasone suppression test (LDDST) could predict non-remission following U-Adx. Additionally, we explored the improvements in hypertension, abnormal glucose metabolism, osteoporosis, and other complications in patients with PBMAH post-U-Adx. After U-Adx, 22 of the 45 patients (48.89%) achieved initial remission within 6 months. At the last follow-up, 25 of the 45 patients underwent all required biochemical tests and cortisol assessment tests, among which eight of 25 (32.00%) were in remission and 17 of 25 (68.00%) were experiencing persistent hypercortisolism. Moreover, five of those 25 patients exhibited recurrence after initial remission. Baseline 24-h UFC level > 2 times the upper limit of normal (2ULN) and unsuppressed 24-h UFC after LDDST may predict persistent hypercortisolism postoperatively. Lastly, long-term postoperative follow-up revealed that hypertension decreased with hypercortisolism remission, whereas osteoporosis worsened with persistent hypercortisolism. The short-term remission rate of hypercortisolism was 48.89% in patients with PBMAH treated with U-Adx, while a long-term remission rate of 32.00% was achieved after a median follow-up of 38.58 months. Furthermore, this finding suggests that baseline 24-h UFC level > 2ULN and unsuppressed 24-h UFC after LDDST predict persistent hypercortisolism in the long-term post-U-Adx. Finally, U-Adx improved cortisol circadian rhythm alterations and ACTH suppression in the patients in the remission group, thereby substantially alleviating hypertension and delaying the development of osteoporosis linked to PBMAH.

Primary Bilateral Macronodular Adrenal Hyperplasia: A Case Series from a Tertiary Hospital

Introduction: Primary bilateral macronodular adrenal hyperplasia (PBMAH) is a rare etiology of Cushing’s syndrome characterized by the presence of multiple adrenal macronodules and variable levels of cortisol excess. Its pathogenesis is complex, involving mechanisms such as aberrant hormone receptors, adrenal paracrine ACTH production, and genetic germline pathogenic variants. However, management is not well established. Methods: This was a retrospective, observational study. We evaluated patients with PBMAH at our tertiary center. We aimed to describe the clinical, hormonal, and radiological characteristics; treatment approaches; and outcomes. Results: Twenty patients were included in this study. Patients had a mean age at diagnosis of PBMAH of 56.1 ± 11.1 years, and 10 patients (50.0%) were females. Most cases were initially investigated for adrenal incidentalomas. Median 8:00 a.m. serum cortisol after 1 mg dexamethasone overnight suppression test was 223.5 (73.1–698.6) nmol/L (8.11 [2.65–25.3] µg/dL), late-night salivary cortisol was 1.48 (0.765–3.21) times the upper limit of normal (ULN), and 24 h-UFC was 1.61 (0.42–3.64) times the ULN. One patient presented with the co-secretion of cortisol and aldosterone. Mean total adrenal size was 98.5 ± 25.6 mm, and the largest nodule size was 32.1 ± 9.09 mm. In six (31.6%) patients, the largest nodule had an attenuation higher than 10 HU. Germline pathogenic variants in ARMC5 were found in four (50.0%) of the eight tested patients who underwent genetic testing. Treatment strategies varied, with unilateral adrenalectomy often successfully controlling hypercortisolism in five (83.3%) of 6 patients with modest excess cortisol secretion. For mild autonomous cortisol secretion, active surveillance of comorbidities and appropriate treatment were not associated with progression of cortisol secretion after a median follow-up of 34.0 (10.5–83.0) months. Conclusion: This study underscores the need for personalized management strategies and identifies areas for future research to optimize the care of patients with PBMAH.

12573 Management Challenges In A Young Male With Bilateral Macronodular Adrenal Hyperplasia

Abstract Disclosure: C. Nguyen: None. V. Ghernautan: None. L.Y. Melendez-Ramirez: None. M.C. Chiang: None. D. Lovre: None. Bilateral adrenal hyperplasia (BAH) may present in isolation or as part of a syndrome. It is classified according to nodule size as Macronodular: primary bilateral macronodular adrenal hyperplasia (PBMAH), or Micronodular: primary pigmented micronodular adrenal hyperplasia (PPNAD) and isolated micronodular adrenal hyperplasia (iMAD). High variability in cortisol secretion and disease progression is seen in both forms subclinical and overt Cushing’s Syndrome (CS). In PBMAH, bilateral adrenalectomy is advised for remission of CS, but benefits must be weighed against risks of lifelong adrenal insufficiency. A 45-year-old male with hypertension, depression, prediabetes, obesity presented to clinic for second opinion regarding incidentally discovered adrenal nodules five years prior with negative initial hormonal workup. Over the previous year he had gained 20 lbs. and developed proximal muscle weakness and sleep apnea. Physical exam showed uncontrolled hypertension and increased abdominal and supraclavicular fat. Hormonal testing revealed hypercortisolism. Adrenal CT confirmed bilateral adrenal nodules up to 4.9 cm with absolute washout ≥60% consistent with benign etiology. CS secondary to PBMAH was diagnosed. Prior to surgical evaluation. Ketoconazole 200 mg twice daily was started and titrated to 400 mg twice daily over the next three months. ACTH became detectable and symptoms of hypercortisolism improved. Right adrenalectomy was performed. Surgical pathology showed golden yellow-orange nodules with minimal grey adrenal parenchyma without necrosis or hemorrhage. The gland was 9.5 x 5.8 x 2.6 cm and weighed 85 g. Microscopic examination showed macronodular hyperplasia. Following surgery, he experienced a 17-pounds weight loss, improvement in blood pressure and quality of life. Three months later, hypercortisolism recurred. He elected to be monitored clinically and contemplating option of left adrenalectomy.Our case highlights the challenges in the care of patients with PBMAH. Bilateral adrenalectomy (BA) is the classical treatment. Its disadvantages include life-long hormone replacement with risk for adrenal crisis, increased morbidity, and mortality. Surgical alternatives, such as unilateral adrenalectomy (UA) and UA with subtotal contralateral adrenal resection, have shown promising results with up to 90% remission rates. The role of adjuvant novel medical therapy is unknown. Studies to compare cost, quality of life, cardiovascular risk, comorbidities, and life span between BA and UA are lacking. New biomarkers are needed to allow closer monitoring of disease progression. Additional research is necessary on medical management of hypercortisolism recurrence after UA and its long-term safety. Finally, given the presence of germline defects associated with adrenal hyperplasia, genetic testing should be offered to all patients with BAH. Presentation: 6/1/2024

The value of serum dehydroepiandrosterone sulfate in the functional evaluation of adrenal space-occupying lesions in adults

Objective: To evaluate the function of serum dehydroepiandrosterone sulfate (DHEAS) in adult adrenal space-occupying lesions. Methods: In this cross-sectional study, 395 patients with adrenal space-occupying lesions who had their DHEAS levels measured were collected from the First Medical Center of Chinese PLA General Hospital from January 2010 to June 2021. They were divided into the adrenal Cushing syndrome (ACS) group (n=100) and non-ACS group (n=295). The former was divided into the cortisol-producing adrenal adenoma (CPA) group (n=67) and primary bilateral macronodular adrenal hyperplasia (PBMAH) group (n=33). Clinical data of each group were collected and compared among groups by independent samples t-test, chi-square test, and Mann-Whitney U test. Serum DHEAS ratio corrected for age and sex was further constructed to identify the receiver operating characteristic curve and the optimal tangent point value for different adrenal occupation. Results: Patients in the ACS group were younger (44.9±13.7 vs. 49.9±12.5, P=0.001); had a larger proportion of women (79/100 vs.139/295, P=0.001); and had higher cortisol levels [8∶00Am, 497.31 (343.52, 606.50) vs. 353.11 (267.50, 487.91) nmol/L, P<0.001] than those in the non-ACS group. The serum DHEAS level and ratio in the ACS group were significantly lower than those in the non-ACS group [0.50 (0.40, 1.21) vs. 2.68 (1.56, 4.32) μmol/L, 1.00 (0.43, 1.68) vs. 3.17 (2.21, 4.54), both P<0.001]. When the serum DHEAS ratio cut-off point was 1.29, the sensitivity and specificity for differential diagnosis of ACS and non-ACS were 72.0% and 91.5% respectively. The ratio of DHEAS in the CPA group was lower [0.58 (0.27, 1.05) vs. 1.14 (1.04, 2.40), P<0.001] than that in the PBMAH group. When the serum DHEAS ratio cut-off point was 0.99, the sensitivity and specificity for differential diagnosis of CPA and PBMAH were 64.2% and 81.2% respectively. Conclusion: Corrected age-sex DHEAS ratio can assist in the functional assessment of adrenal space-occupying lesions.

Primary unilateral macronodular adrenal hyperplasia with concomitant glucocorticoid and androgen excess and KDM1A inactivation.

Primary bilateral macronodular adrenal hyperplasia (PBMAH) is a rare cause of Cushing's syndrome. Individuals with PBMAH and glucose-dependent insulinotropic polypeptide (GIP)-dependent Cushing's syndrome due to ectopic expression of the GIP receptor (GIPR) typically harbor inactivating KDM1A sequence variants. Primary unilateral macronodular adrenal hyperplasia (PUMAH) with concomitant glucocorticoid and androgen excess has never been encountered or studied. We investigated a woman with a large, heterogeneous adrenal mass and severe adrenocorticotropic hormone-independent glucocorticoid and androgen excess, a biochemical presentation typically suggestive of adrenocortical carcinoma. The patient presented during pregnancy (22nd week of gestation) and reported an 18-month history of oligomenorrhea, hirsutism, and weight gain. We undertook an exploratory study with detailed histopathological and genetic analysis of the resected adrenal mass and leukocyte DNA collected from the patient and her parents. Histopathology revealed benign macronodular adrenal hyperplasia. Imaging showed a persistently normal contralateral adrenal gland. Whole-exome sequencing of 4 representative nodules detected KDM1A germline variants, benign NM_001009999.3:c.136G > A:p.G46S, and likely pathogenic NM_001009999.3:exon6:c.865_866del:p.R289Dfs*7. Copy number variation analysis demonstrated an additional somatic loss of the KDM1A wild-type allele on chromosome 1p36.12 in all nodules. RNA sequencing of a representative nodule showed low/absent KDM1A expression and increased GIPR expression compared with 52 unilateral sporadic adenomas and 4 normal adrenal glands. Luteinizing hormone/chorionic gonadotropin receptor expression was normal. Sanger sequencing confirmed heterozygous KDM1A variants in both parents (father: p.R289Dfs*7 and mother: p.G46S) who showed no clinical features suggestive of glucocorticoid or androgen excess. We investigated the first PUMAH associated with severe Cushing's syndrome and concomitant androgen excess, suggesting pathogenic mechanisms involving KDM1A.

The value of dehydroepiandrosterone sulfate in the differential diagnosis of primary bilateral adrenal macronodular hyperplasia

Objective: To investigate the value of serum dehydroepiandrosterone sulfate (DHEAS) in the differential diagnosis of primary bilateral macronodular adrenal hyperplasia (PBMAH) from nonfunctional adenoma tumors (NFA), adrenocortical adenoma (ADA) and Cushing's disease (CD). Methods: A cross-sectional study. The clinical data of 302 patients with PBMAH, NFA, ADA and CD diagnosed and treated in the First Medical Center of PLA General Hospital from January 2010 to June 2021 were retrospectively analyzed. Among them, 97 were males and 205 were females, aged (45.7±7.2) years. The area under receiver operating characteristic (ROC) curve was used to evaluate the DHEAS ratio (serum DHEAS value divided by the lower limit of normal reference range for the corresponding age and sex) and the 8∶00 adrenocorticotropic hormone (ACTH) level in the differential diagnosis of PBMAH from NFA, ADA and CD. The maximum value of Youden index was cut-off value. Results: Among the 302 patients, 33 were in PBMAH group, 125 were in NFA group, 67 were in ADA group, and 77 were in CD group. The DHEAS ratio in CD group, NFA group, PBMAH group and ADA group decreased successively, with values of 6.34(4.44, 9.93), 3.37(2.24, 4.79), 1.14(1.04, 2.40) and 0.58(0.27, 1.05), respectively. There was statistical significance among all groups (all P<0.01). The area under the ROC curve for distinguishing PBMAH from NFA, ADA and CD were 0.803, 0.741 and 0.930, and the cut-off value were 2.59, 0.99 and 2.92, respectively. The sensitivity was 66.1%, 64.2% and 87.9%, respectively. The specificity was 81.8%, 81.2% and 85.7%. According to the level of 8∶00 ACTH, PBMAH was divided into ACTH-inhibited group (ACTH<2.2 pmol/L,n=18) and ACTH-non-inhibited group (ACTH≥2.2 pmol/L, n=15).The DHEAS ratio in ACTH-non-inhibited PBMAH group was higher than that in ACTH-inhibited PBMAH group(P<0.01).The area under ROC curve of DHEAS ratio for identifying ACTH-non-inhibited PBMAH and CD was 0.877, the cut-off value was 4.55, the sensitivity was 93.3%, and the specificity was 75.3%. If the DHEAS ratio combined with 8∶00 ACTH was used as a differential diagnostic indicator, the area under the ROC curve for distinguishing ACTH-non-inhibitory PBMAH from CD can reach 0.967, with the sensitivity of 100.0% and the specificity of 81.8%. Conclusions: DHEAS ratios is different in PBMAH, NFA, ADA and CD patients, which can assist in the differential diagnosis of PBMAH from NFA、ADA and CD patients, especially in the differential diagnosis of ACTH-non-inhibited PBMAH patients and CD patients.

From the First Case Reports to KDM1A Identification: 35 Years of Food (GIP)-Dependent Cushing's Syndrome.

Food-dependent Cushing's syndrome (FDCS) is a rare presentation of hypercortisolism from adrenal origin, mostly observed in primary bilateral macronodular adrenal hyperplasia (PBMAH) but also in some cases of unilateral adrenocortical adenoma. FDCS is mediated by the aberrant expression of glucose-dependent insulinotropic peptide (GIP) receptor (GIPR) in adrenocortical cells. GIP, secreted by duodenal K cells after food intake, binds to its ectopic adrenal receptor, and stimulates cortisol synthesis following meals. FDCS was first described more than 35 years ago, and its genetic cause in PBMAH has been recently elucidated: KDM1A inactivation by germline heterozygous pathogenic variants is constantly associated with a loss-of-heterozygosity of the short arm of chromosome 1, containing the KDM1A locus. This causes biallelic inactivation of KDM1A, resulting in the GIPR overexpression in the adrenal cortex. These new insights allow us to propose the KDM1A genetic screening to all PBMAH patients with signs of FDCS (low fasting cortisol that increases after a mixed meal or oral glucose load) and to all first-degree relatives of KDM1A variant carriers. Given that KDM1A is a tumor suppressor gene that has also been associated with monoclonal gammopathy of uncertain significance and multiple myeloma, the investigation of FDCS in the diagnostic management of patients with PBMAH and further genetic testing and screening for malignancies should be encouraged.

Results of systematic KDM1A genotyping in a large series of Primary Bilateral Macronodular Adrenal Hyperplasia (PBMAH) patients and analysis of the genotype/phenotype correlation

Results of systematic KDM1A genotyping in a large series of Primary Bilateral Macronodular Adrenal Hyperplasia (PBMAH) patients and analysis of the genotype/phenotype correlation

Primary bilateral macronodular adrenal hyperplasia caused by a novel variant in the ARMC5 gene

Primary bilateral macronodular adrenal hyperplasia caused by a novel variant in the ARMC5 gene

KDM1A genotyping and expression in 146 sporadic somatotroph pituitary adenomas.

A paradoxical increase of growth hormone (GH) following oral glucose load has been described in ∼30% of patients with acromegaly and has been related to the ectopic expression of the glucose-dependent insulinotropic polypeptide (GIP) receptor (GIPR) in somatotropinomas. Recently, we identified germline pathogenic variants and somatic loss of heterozygosity of lysine demethylase 1A (KDM1A) in patients with GIP-dependent primary bilateral macronodular adrenal hyperplasia with Cushing's syndrome. The ectopic expression of GIPR in both adrenal and pituitary lesions suggests a common molecular mechanism. We aimed to analyze KDM1A gene sequence and KDM1A and GIPR expressions in somatotroph pituitary adenomas. We conducted a cohort study at university hospitals in France and in Italy. We collected pituitary adenoma specimens from acromegalic patients who had undergone pituitary surgery. We performed targeted exome sequencing (gene panel analysis) and array-comparative genomic hybridization on somatic DNA derived from adenomas and performed droplet digital PCR on adenoma samples to quantify KDM1A and GIPR expressions. One hundred and forty-six patients with sporadic acromegaly were studied; 72.6% presented unsuppressed classical GH response, whereas 27.4% displayed a paradoxical rise in GH after oral glucose load. We did not identify any pathogenic variant in the KDM1A gene in the adenomas of these patients. However, we identified a recurrent 1p deletion encompassing the KDM1A locus in 29 adenomas and observed a higher prevalence of paradoxical GH rise (P = .0166), lower KDM1A expression (4.47 ± 2.49 vs 8.56 ± 5.62, P < .0001), and higher GIPR expression (1.09 ± 0.92 vs 0.43 ± 0.51, P = .0012) in adenomas from patients with KDM1A haploinsufficiency compared with those with 2 KDM1A copies. Unlike in GIP-dependent primary bilateral macronodular adrenal hyperplasia, KDM1A genetic variations are not the cause of GIPR expression in somatotroph pituitary adenomas. Recurrent KDM1A haploinsufficiency, more frequently observed in GIPR-expressing adenomas, could be responsible for decreased KDM1A function resulting in transcriptional derepression on the GIPR locus.

O-02 Inactivation of KDM1A with the concurrent presence of MGUS in a patient with GIP-dependent Cushing's syndrome and the vanishing effect of octreotide therapy

Abstract Introduction Glucose-dependent insulinotropic peptide (GIP)-dependent primary bilateral macronodular adrenal hyperplasia (PBMAH) is a rare cause of Cushing's syndrome. It has germline genetic predisposition and requires for personalized approaches to investigation and therapy. We aimed to present the rare case of a GIP-dependent PBMAH patient with unusually severe cortisol secretion and a KDM1A inactivation with an accompanying haematological co-morbidity related to that mutation. Clinical Case A 41-year-old woman presented with a 5-kg weight gain in last 6 months, irritability and fatique. Physical examination revealed elevated blood pressure, increased supraclavicular fat pads, and abdominal obesity. The cortisol level was 25.9 (6.7-22.6) µg/dL in the morning, 16.9 µg/dL in the late night, and 6.5 µg/dL in the morning after an overnight 1 mg of dexamethasone. Urinary free cortisol (UFC) level was also elevated to 2150 (58-403) µg/24-h. The early morning plasma ACTH level was 1.5 (7-63) pg/mL. Abdominal imaging revealed 29×23 mm adenomas on the right and 46×35 mm on the left with high fat content. Cortisol was stimulated by the administration of mixed meals (+537%) but not by TRH, GnRH, metoclopramide or upright posture. The response to mixed meals was blunted by pretreatment with subcutaneous 100 mg octreotide. Following the patient's diagnosis of GIP-dependent PBMAH, octreotide LAR therapy was initiated. Although inducing a significant acute suppression of UFC and improvement in symptoms during the first 3 months, the UFC began to rise due to the resistance in the following period (Figure 1). After 9 months of octreotide LAR treatment, left adrenalectomy was performed according to the adrenal volumetric assessment. Histopathology was reported as diffuse macronodular adrenal hyperplasia without internodular atrophy. Even though the patient had a unilateral adrenalectomy, adrenal insufficiency occurred in the postoperative period. Subsequently, the patient has been closely monitored and followed up with a physiological, divided-dose hydrocortisone replacement regimen for 7 months. A germline heterozygous variant in the KDM1A gene in the patient's blood sample and a recurrent deletion in the short p arm of chromosome 1 harboring the KDM1A locus in the adrenal sample were identified. When screened for diseases associated with the KDM1A mutation, monoclonal gammopathy of undetermined significance (MGUS) was detected in the patient with mild anemia, and genetic counseling was also provided. Conclusion The management of GIP-dependent PBMAH remains controversial, and further therapeutic options are under investigation. Due to the very limited number of case reports and the heterogeneous nature of the disease, special features of our case, which are severe cortisol excess, accompanying MGUS, the vanishing effect of octreotide, and adrenal insufficiency after unilateral adrenalectomy, might contribute to the existing literature.Figure 1.Urinary free cortisol levels following octreotide therapyUFC: Urinary free cortisol, ULN: Upper limit normal, LAR: Long acting release

The role of oxidative stress, glucocorticoid receptor and ARMC5 in lipid metabolism.

Lipid metabolism includes lipogenesis, lipolysis, and cholesterol metabolism and it exerts a wide range of biological effects. We previously found novel roles of adipocyte oxidative stress in diet-induced obesity, adipocyte glucocorticoid receptor in Cushing syndrome, and ARMC5 in adrenocortical cells. Using genetically modified mice in which oxidative stress was eliminated or augmented specifically in adipose tissues, we have been able to elucidate that obesity-induced oxidative stress inhibited healthy adipose expansion and ameliorated insulin sensitivity. Using adipocyte-specific glucocorticoid receptor knockout mice, we found that glucocorticoids also inhibited healthy adipose expansion and decreased insulin sensitivity. This was partly due to the transcriptional upregulation of ATGL. We identified ARMC5 as a novel ubiquitin E3 ligase of full-length SREBF, a master regulator of lipid metabolism. In adrenocortical cells, ARMC5 suppresses SREBF2 activity, and loss of ARMC5 may lead to cholesterol accumulation and the development of primary bilateral macronodular adrenal hyperplasia.

Delineating endogenous Cushing’s syndrome by GC-MS urinary steroid metabotyping

BackgroundDiagnosing Cushing’s syndrome (CS) is highly complex. As the diagnostic potential of urinary steroid metabolome analysis by gas chromatography-mass spectrometry (GC-MS) in combination with systems biology has not yet been fully exploited, we studied a large cohort of patients with CS. MethodsWe quantified daily urinary excretion rates of 36 steroid hormone metabolites. Applying cluster analysis, we investigated a control group and 168 patients: 44 with Cushing’s disease (CD) (70% female), 18 with unilateral cortisol-producing adrenal adenoma (83% female), 13 with primary bilateral macronodular adrenal hyperplasia (PBMAH) (77% female), and 93 ruled-out CS (73% female). FindingsCluster-Analysis delineated five urinary steroid metabotypes in CS. Metabotypes 1, 2 and 3 revealing average levels of cortisol and adrenal androgen metabolites included patients with exclusion of CS or and healthy controls. Metabotype 4 reflecting moderately elevated cortisol metabolites but decreased DHEA metabolites characterized the patients with unilateral adrenal CS and PBMAH. Metabotype 5 showing strong increases both in cortisol and DHEA metabolites, as well as overloaded enzymes of cortisol inactivation, was characteristic of CD patients. 11-oxygenated androgens were elevated in all patients with CS. The biomarkers THS, F, THF/THE, and (An + Et)/(11β-OH-An + 11β-OH-Et) correctly classified 97% of patients with CS and 95% of those without CS. An inverse relationship between 11-deoxygenated and 11-oxygenated androgens was typical for the ACTH independent (adrenal) forms of CS with an accuracy of 95%. InterpretationGC-MS based urinary steroid metabotyping allows excellent identification of patients with endogenous CS and differentiation of its subtypes. FundingThe study was funded by the Else-Kröner-Fresenius-Stiftung and the Eva-Luise-und-Horst-Köhler-Stiftung.

Adrenal Cushing's syndrome in children.

Adrenal Cushing's syndrome is a rare cause of endogenous hypercortisolism in neonatal and early childhood stages. The most common causes of adrenal CS are hyperfunctioning adrenal tumours, adenoma or carcinoma. Rarer causes are primary bilateral macronodular adrenal hyperplasia (PBAMH), primary pigmented adrenocortical disease (PPNAD) and McCune Albright syndrome. The diagnosis represents a challenge for clinicians. In cases of clinical suspicion, confirmatory tests of hypercortisolism should be performed, similarly to those performed in adults. Radiological imaging should be always combined with biochemical confirmatory tests, for the differential diagnosis of adrenal CS causes. Treatment strategies for adrenal CS include surgery and in specific cases medical drugs. An adequate treatment is associated to an improvement of growth, bone health, reproduction and body composition from childhood into and during adult life. After cure, lifelong glucocorticoid replacement therapy and endocrine follow-up are required, notably in patients with Carney's complex disease.

PPARG dysregulation as a potential molecular target in adrenal Cushing's syndrome.

We performed a transcriptomic analysis of adrenal signaling pathways in various forms of endogenous Cushing's syndrome (CS) to define areas of dysregulated and druggable targets. Next-generation sequencing was performed on adrenal samples of patients with primary bilateral macronodular adrenal hyperplasia (PBMAH, n=10) and control adrenal samples (n=8). The validation groups included cortisol-producing adenoma (CPA, n=9) and samples from patients undergoing bilateral adrenalectomy for Cushing's disease (BADX-CD, n=8). In vivo findings were further characterized using three adrenocortical cell-lines (NCI-H295R, CU-ACC2, MUC1). Pathway mapping based on significant expression patterns identified PPARG (peroxisome proliferator-activated receptor gamma) pathway as the top hit. Quantitative PCR (QPCR) confirmed that PPARG (l2fc<-1.5) and related genes - FABP4 (l2fc<-5.5), PLIN1 (l2fc<-4.1) and ADIPOQ (l2fc<-3.3) - were significantly downregulated (p<0.005) in PBMAH. Significant downregulation of PPARG was also found in BADX-CD (l2fc<-1.9, p<0.0001) and CPA (l2fc<-1.4, p<0.0001). In vitro studies demonstrated that the PPARG activator rosiglitazone resulted in decreased cell viability in MUC1 and NCI-H295R (p<0.0001). There was also a significant reduction in the production of aldosterone, cortisol, and cortisone in NCI-H295R and in Dihydrotestosterone (DHT) in MUC1 (p<0.05), respectively. This therapeutic effect was independent of the actions of ACTH, postulating a promising application of PPARG activation in endogenous hypercortisolism.

FRI220 Primary Bilateral Macronodular Adrenal Hyperplasia: A Rare Cause Of Cushing Syndrome

Abstract Disclosure: Y. Ortiz: None. A.M. Aviles Melendez: None. M.M. Mangual Garcia: None. J.M. Garcia-Mateo: None. Primary bilateral macronodular adrenal hyperplasia (PBMAH) is a highly heterogenous entity whose pathophysiology remains largely unclear, representing less than 2% of Cushing syndrome (CS) cases, which leads to a challenging diagnosis. Many patients have a mild clinical picture and remain undiagnosed until abdominal imaging for unrelated reasons reveals bilateral adrenal enlargement. Hereby, we describe the case of a patient presented with abdominal pain and clinical hypercortisolism due to PBMAH. Case of a 42-year-old female with past medical history of arterial hypertension, referred for evaluation due to bilateral adrenal masses found on abdominal CT scan performed after patient presented with abdominal discomfort. On initial evaluation, patient refers a 50 pounds weight gain, increase in abdominal circumference, muscle weakness and sudden onset of facial and abdominal hair growth. Physical examination reveals dorsocervical fat pad, proximal muscle weakness, moon facies, facial and abdominal hirsutism. Abdominal CT scan with adrenal protocol showed bilateral adrenal lesions, with largest measuring 2.8 and 3.9 cm on the left side, with attenuation of 16 and 7.4 Hounsfield units. The absolute and relative washouts for the first were 76.6% and 61.6%, and for the second 73.5% and 67.1%, both consistent with adenomas. Laboratory results showed late night salivary cortisol levels of 4.60 ug/dl and 4.80 ug/dl, values which may be high or even normal due to ineffective steroidogenesis on PBMAH. Other labs consisted of low dose 1 mg dexamethasone suppression test: 4.80 ug/dl, and ACTH level: 9.60 pg/ml, which confirms clinical hypercortisolism, indeterminate for ACTH-independent cause. Desmopressin test was not performed, since levels may not be fully suppressed in PBMAH due to ectopic production by adrenal glands, leading to an erroneous diagnosis of ACTH-dependent CS. DHEA level of 618 ug/dl can also be increased, which could lead to a diagnosis of adrenocortical carcinoma. Considering risk of recurrence, risk for adrenal insufficiency, and lower documented complications, unilateral left-sided adrenalectomy was chosen as the best surgical treatment, despite bilateral adrenalectomy being the gold standard for diagnosis. Surgical pathology report showed Adrenocortical adenoma with associated myelolipomatous foci of 7.5 cm in greatest dimension. Despite limited data regarding unilateral adrenalectomy, it appears to convey clinical and biochemical benefits in most cases. Initial remission reported reaches more than 90% with low risk of recurrence between 10-15%. Adrenal insufficiency, despite the presence of residual hyperplastic adrenal tissue, occurs in about one-third of patients and is usually transient. Our case is a great example of the importance of individualization of management options based on therapy benefits, and decreased risks of future complications. Presentation: Friday, June 16, 2023

FRI266 Medical Management Of Cushing’s Syndrome Caused By Primary Bilateral Macronodular Adrenal Hyperplasia (PBMA) With Low Dose Of Ketoconazole

Abstract Disclosure: J.S. Hatfield: None. C.M. Godar: None. N.O. Vietor: None. T.D. Hoang: None. M.K. Shakir: None. Introduction: Primary bilateral macronodular adrenal hyperplasia (PBMA) is an uncommon cause of endogenous Cushing's syndrome, defined as both adrenal glands with multiple nodules &amp;gt; 10mm in diameter. It often presents as incidentally found, bilateral, macronodular adrenal glands in patients between 40-60 years of age, frequently with only mild cortisol elevation. Although surgical treatment is recommended in these patients, we report the effectiveness of low-dose ketoconazole to control excessive cortisol secretion. Clinical Case: A 62 y/o woman with type 2 diabetes mellitus and hypertension was found to have bilateral adrenal nodules in 2010 while undergoing evaluation for abdominal pain. An adrenal CT scan confirmed bilateral adrenal nodules (largest left adrenal nodule 3.2cm x 2.9cm and right adrenal nodule 1.0cm x 1.0 cm). She was first referred for endocrine biochemical evaluation nearly 9 years later. Cortisol after 1mg dexamethasone suppression test was 17.3 mcg/dL, with corresponding ACTH of 3.1 pg/mL and dexamethasone of 310 ng/d, 24H urine cortisol 61 mcg/24 hr (6-42), 11 pm salivary cortisol 0.141, 0.133, 0.142 mcg/dL, and DHEA-S 11.4 mcg/dL (18.9-205.0). Biochemical evaluation for pheochromocytoma and primary hyperaldosteronism were negative. Serum 17-Hydroxyprogesterone 27 ng/dL was normal. Clinically, beyond her hypertension and diabetes she has no stigmata of hypercortisolism. Her type 2 diabetes with HbA1c of 7.8 is controlled with sitagliptin, insulin glargine and correctional lispro, and hypertension is treated with lisinopril. Due to the patient’s hesitancy for surgery, she was initiated on fluconazole which initially normalized urine cortisol levels (24H cortisol 20 mcg/24hr), though a rise to 70 mcg/24hr was noted after 6 months of treatment. She was transitioned to ketoconazole 200mg BID with resultant lowering of cortisol. Treatment was complicated by severe body aches that impaired ambulation, and symptoms resolved after decrease of ketoconazole to 100mg daily and rosuvastatin from 10mg to 5mg daily. Urine cortisol has remained in the normal range (15-22 mcg/24hr) for the last 2.5 years with no further side effects from ketoconazole. Discussion: Our patient’s clinical features suggest a diagnosis of PBMA. Most patients with PBMA have only mild elevation of cortisol levels and present with bilateral adrenal incidentalomas as seen in our patient. The classical features of Cushing's syndrome may be absent, and the nodular adrenals are frequently identified when abdominal imaging is performed for unrelated reasons. The amount of cortisol secretion is often sufficient to produce mild or overt Cushing’s syndrome. Although surgical treatment was considered, our patient was successfully treated with low-dose ketoconazole and thus, this may be an option in patients with mild PBMA-related Cushing’s syndrome. Presentation: Friday, June 16, 2023

FRI153 Genetic Variant In Armadillo Repeat Containing 5 Gene (ARMC5) Associates With Salt Sensitivity Of Blood Pressure And Aldosterone In A Caucasian Cohort

Abstract Disclosure: W.W. Parksook: None. M. Heydarpour: None. L. Pojoga: None. A. Gaye: None. G.H. Gibbons: None. G.H. Williams: Advisory Board Member; Self; Cereno. Consulting Fee; Self; Alnylam, Crinetics, Damian, KBP bioscience, Paxel, Relapsa, Unicycive. Grant Recipient; Self; NIH 2 grants. J.S. Williams: Advisory Board Member; Self; Mellicell, Inc. Background: Genetic alterations of ARMC5 have been reported in various adrenal disorders, particularly in primary bilateral macronodular adrenal hyperplasia. Increasing evidence shows that polymorphic variants in ARMC5 are also associated with blood pressure (BP), hypertension, and the renin-angiotensin-aldosterone-system (RAAS) in individuals of African descent; however, little is known about these relationships in Caucasians. Herein, we conducted a deep phenotyping study to assess the association of ARMC5 variants with BP, salt sensitivity of BP (SSBP), and components of the RAAS in Caucasians. Methods: Normotensive and hypertensive, non-diabetic, non-chronic kidney disease, Caucasian participants underwent two dietary interventions at 5-7 days apart (200 mmol/day and 10 mmol/day sodium) to assess SSBP and other hormonal parameters. All participants were genotyped using a Multi-Ethnic-Genotyping-Array. Association analysis and the quality control of the genomic data were assessed by PLINK. Participants with complete data for SSBP and hormonal parameters, who were in salt balance, were included in the analysis (n= 306). Multiple linear regression models were used to assess the association between the genetic variant and outcome parameters. Results: There were 5 single nucleotide polymorphisms in the ARMC5 region. rs4889660 was significantly associated with SSBP in additive and dominant models when adjusted by Bonferroni correction. In a candidate gene analysis, rs4889660 risk allele carriers had greater SSBP than non-risk allele homozygotes (β= 4 mmHg, P= 0.03). Following dietary sodium restriction, rs4889660 risk allele carriers had lower serum aldosterone levels in an upright position (β= -6.9 ng/dl, P= 0.04) and serum aldosterone levels after angiotensin II stimulation (β= -3.0 ng/dl, P= 0.02). There were no differences between plasma renin activity, serum and urinary cortisol levels, and renal plasma flows between genotypes. Conclusions: There was an association between the ARMC5 rs4889660 variant and SSBP in Caucasians. With dietary sodium restriction, aldosterone responses to both upright posture and angiotensin II infusion were lower in the risk allele carriers. The reduced aldosterone responses suggest that an alteration in the RAAS system is not the cause of the SSBP, but is in response to a defect in another sodium-mediated homeostatic mechanism. Presentation: Friday, June 16, 2023