12455 Bone Mineral Density Improvement After Resolution Of Endogenous Cushing Syndrome

Abstract

Abstract Disclosure: C. Plessias: None. N. Charoenngam: None. T. Rittiphairoj: None. T. Suenghataiphorn: None. T. Srikulmontri: None. P. Wattanachayakul: None. M. Kurt: None. Bone Mineral Density Improvement After Resolution of Endogenous Cushing Syndrome: a Meta-analysis and meta-regression Patients with endogenous Cushing syndrome (eCS) are known to have decreased bone mineral density (BMD) and are prone to fragility fractures. Treatment of eCS have been shown in multiple studies to result in improvement in BMD. However, the degree of BMD improvement after resolution of eCS remains inadequately explored due to limited sample sizes in existing studies. Through systematic review, meta-analysis, and meta-regression techniques, we aimed to identify all available evidence to evaluate BMD improvement after resolution of eCS. Potentially eligible studies were identified from the PubMed and EMBASE databases from inception to February 2024, utilizing a search strategy incorporating terms related to "Bone mineral density" and "Cushing syndrome". Eligible studies must include adult or pediatric patients diagnosed with any form of eCS, encompassing Cushing disease (CD), adrenal adenoma, mild autonomous cortisol secretion or ectopic ACTH-secreting tumors, who received treatment resulting in CS resolution. These studies must either present lumbar spine (LS) or femoral neck (FN) BMD measurements in the form of T-score, Z-score or actual BMD values before and after CS resolution, or report mean differences (MD) of BMD, or provide individual BMD data. Point estimates with corresponding standard errors were extracted from each study and combined using the generic inverse variance method. Meta-regression analysis was utilized to explore the impact of time after resolution of eCS on BMD improvement.A total of 5,085 records were identified from the databases. After systematic review, 14 studies, including a total of 386 patients, were deemed eligible for analysis. The meta-analysis demonstrated that resolution of eCS resulted in statistically significantly improvement of LS BMD (pooled MD: Z-score: +0.76, 95%CI 0.50 – 1.02, I2 76%; T-score: +0.87, 95%CI 0.55 – 1.19, I2 78%; actual BMD: +0.092 g/cm2, 95%CI 0.060 – 0.124, I2 74%) and FN BMD (pooled MD: Z-score: +0.54, 95%CI 0.32 – 0.76, I2 75%; T-score: +0.38, 95%CI 0.25 – 0.51, I2 0%; actual BMD: +0.041 g/cm2, 95%CI 0.021 – 0.062, I2 0%). The meta-regression analysis revealed a statistically significant association between follow-up time and improvements in LS T-score BMD (predicted LS T-score improvement = 0.42 + 0.062 × year, p = 0.027) and FN Z-score BMD (predicted FN Z-score improvement = 0.35 + 0.037 × year, p = 0.003), but not with LS Z-score and FN T-score.In summary, our study presents the extent of improvement in LS and FN BMD following the resolution of eCS based on all available data in the literature. These findings have clinical significance as they offer guidance for management of osteoporosis following the resolution of eCS. Presentation: 6/3/2024