OR17-05 Lysine Demethylase KDM1A And Ectopic Expression Of GIP-Receptor In Somatotropinomas Of Patients With Paradoxical Response To Oral Glucose
Abstract
Abstract Disclosure: F. Chasseloup: None. L. Tosca: None. D. Regazzo: None. A. Proust: None. M. Hage: None. E. Kuhn: None. C. Jublanc: None. K. Mokhtari: None. S. Salenave: None. S. Gaillard: None. F. Parker: None. A. Boch: None. G. Tachdjian: None. P. Chanson: None. J. Bouligand: None. G. Occhi: None. P. Kamenicky: None. Introduction: Paradoxical increase of 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 of lysine demethylase 1A (KDM1A) in patients with GIP-dependent primary bilateral macronodular adrenal hyperplasia with Cushing’s syndrome. Most patients also displayed a deletion of chromosome 1p, including the KDM1A locus in their adrenal tissues, resulting in complete loss of KDM1A expression. The ectopic expression of GIPR in both adrenal and pituitary lesions suggests a common molecular mechanism. The aim of our study was to search for genetic abnormalities of KDM1A in somatotroph pituitary adenomas. Methods: We collected somatotropinoma specimens from acromegalic patients followed in two tertiary endocrine centers in France and one in Italy. Somatic DNA was studied by targeted exome NGS and array-CGH. GIPR and KDM1A expression was quantified in the tumors using digital droplet PCR. Results: We included 186 patients: 108 patients (70.6 %)…
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Evidence Hub reads this as a cohort study, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 186 participants or records.
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