Genomic and Metabolomic Markers Reflecting the Complications of Hypercortisolism (CUSHINGOMICS)

Genomic and Metabolomic Markers Reflecting the Complications of Hypercortisolism

The excess of glucocorticoid, whether endogenous or exogenous, results in Cushing's syndrome, associating a particular distribution of fats (accumulation in the face and trunk), a decrease in the thickness of the muscles, diabetes, hypertension or osteoporosis.

The level of effects obviously depends on the extent of the excess glucocorticoids, and on the duration of this exposure. However, the manifestations of Cushing's syndrome also depend very much on the sensitivity of each individual to glucocorticoids for each of these conditions. Indeed, for the same duration and level of exposure, some will have diabetes only, others only osteoporosis, others hypertension, while still others will have these three complications. Today the investigators are unable to specify individual risks. For example, will someone develop diabetes when exposed to glucocorticoids? Or on the contrary will blood sugar level remain normal? The same question arises for hypertension and osteoporosis.

The deficiency of glucocorticoid, called adrenal insufficiency, causes fatigue and discomfort. The intensity of the signs depends on the depth of the insufficiency. Here again, there is a large variability in the sensitivity of each individual to glucocorticoids: when one substitutes for adrenal insufficiency at a given dose, some individuals will feel well, while others will still remain tired. The investigators are unable to specify participant's individual requirement.

The aim of this research is to identify factors that determine individual sensitivity to glucocorticoids. For excess glucocorticoids, the investigators are looking for specific molecular markers for each type of glucocorticoid complication: markers for corticosteroid-induced diabetes, corticosteroid-induced hypertension, or corticosteroid-induced osteoporosis.

For adrenal insufficiency, they are also looking for substitute good balance markers for adrenal insufficiency.

To answer the research question, it is planned to include 400 subjects exposed to glucocorticoid excess (by excess of endogenous glucocorticoids or induced by corticosteroid therapy) and 100 subjects with adrenal insufficiency. It is also planned to include 100 subjects without excess glucocorticoids but presenting either diabetes, hypertension or osteoporosis; these subjects will constitute a control group. The investigators will perform a very large number of measurements in small amounts of blood and urine, in order to identify a few marks specifically associated with each of the complications. This research will identify, for every person exposed to glucocorticoids, the probability of developping some complications, and reversely the probability of being exempt from other complications.

For each participant, easily accessible biological samples will be taken (blood, urine, saliva). From these samples, a large number of molecular markers will be generated (genomics, metabolomics), in search of signatures specifically associated with each complication.

Three main types of complications will be analyzed: diabetes, hypertension and osteoporosis.

The analysis is planned in 4 stages:

• Identify markers for each type of complication in the context of excess frank glucocorticoids, by comparing affected patients and those not affected for each type of complication.
• Subtraction of non-specific markers of diabetes, hypertension and osteoporosis, identified by the analysis of diabetic, hypertensive and osteoporotic patients who do not have excess glucocorticoids
• Test the performance of these markers in an independent cohort of patients presenting an excess of glucocorticoids at variable levels: frank and at least (endogenous, exogenous)
• Test the performance of these markers in a cohort of patients with substituted adrenal insufficiency

Inclusion Criteria:

• an endogenous hypercortisolism (group 1)
• a disease justifying the next start of glucocorticoid therapy (group 2)
• chronic adrenal insufficiency (group 3)
• subjects with either diabetes, hypertension or osteoporosis, but without glucocorticoid excess (control group)
• patients will have to be affiliated to a social security scheme
• patients should be able to understand the study and able to express their consent

Exclusion Criteria:

• patients with reduced life expectancy, less than 2 years
• pregnant or lactating women
• patients refusing the protocol
• patients under state medical assistance