In hyperglycemia secondary to endogenous hypercortisolism KORLYM IS PROVEN TO LOWER HbA1c1,2

Explore the CATALYST study

CATALYST was a 2-part study on the prevalence & treatment of endogenous hypercortisolism2,3*

In the Screening Phase of CATALYST, almost 1 in 4 patients with difficult-to-control T2D were diagnosed with endogenous hypercortisolism.

In the Treatment Phase, Korlym demonstrated significant HbA1c reductions in a subset of eligible patients with difficult-to-control T2D and endogenous hypercortisolism.2,3

HbA1c.
Significant reductions in HbA1c–with or without adrenal abnormalities2

In the Treatment Phase of CATALYST, patients with endogenous hypercortisolism who received Korlym showed clinically significant reductions in HbA1c, whether or not they had adrenal abnormalities.

See HbA1c Improvements
Decreased dosing or discontinuation of T2D medications1,2

In the Treatment Phase of CATALYST, many patients with endogenous hypercortisolism who received Korlym were able to decrease their doses or completely discontinue common T2D medications.

See Dosing Improvements
Improvements in body composition2

In the Treatment Phase of CATALYST, patients with endogenous hypercortisolism who received Korlym improved their body composition with weight loss and reductions in waist circumference.

See Body Composition Improvements

CATALYST was a prospective, phase 4 study with two parts. The first part (Screening Phase) assessed the prevalence of endogenous hypercortisolism in 1057 patients with difficult-to-control T2D diagnosed ≥1 year prior and defined as HbA1c 7.5%-11.5% AND taking ≥3 T2D medications OR insulin and other T2D medication(s) OR ≥2 T2D medications AND the presence of ≥1 microvascular or macrovascular complication AND/OR concomitant hypertension requiring ≥2 hypertension medications.  Hypercortisolism was defined as a post 1-mg DST cortisol >1.8 μg/dL with AM dexamethasone ≥140 ng/dL. In the second part (Treatment Phase), patients with hypercortisolism who met inclusion/exclusion criteria (n=136) were randomized (2:1) to receive either Korlym or placebo for 24 weeks in a double-blind, placebo-controlled manner. The primary endpoint was the reduction of HbA1c between these groups. Please see full study design on this page.2,3

Significant HbA1c changes were observed with Korlym2,4

Patients treated with Korlym experienced a statistically significant 1.47% change in HbA1c at week 24

Graph showing patients achieving a significant 1.47% mean reduction in HbA1c by Week 24 in the CATALYST study.
  • Baseline HbA1c was 8.62% for patients treated with Korlym, and 8.41% in patients treated with placebo

  • In patients who completed the CATALYST study, patients treated with Korlym (n=47) experienced a clinically meaningful -1.7% (95% CI: -2.1, -1.3) change in HbA1c vs -0.1% (95% CI: -0.6, 0.3) in patients treated with placebo (n=36)2

CI, confidence interval; HbA1c, hemoglobin A1c; LS, least-squares.

N=136 patients enrolled; randomized 2:1 to mifepristone (n=91) or placebo (n=45). P-value for change from baseline to week 24 (within arm) based on Wilcoxon signed rank test.

Least-square mean, confidence interval, and P-value between treatment arms based on a Mixed Model for Repeated Measures (MMRM).

Clinically significant changes in HbA1c at week 24 were observed in patients treated with Korlym, both with and without an adrenal imaging abnormality2,4

A change in HbA1c was observed in patients with hypercortisolism and difficult-to-control T2D treated with Korlym, regardless of the presence of an adrenal imaging abnormality

Bar graph showing LS Mean change in HbA1c (%) from baseline for Korlym-treated patients with adrenal abnormalities (-1.26%) and without (-1.58%).

Additional improvements were observed with Korlym2

Patients taking Korlym experienced early reductions or discontinuation of concomitant antihyperglycemic medication by week 12

KorlymPlacebo
Fast-acting insulin30.3% (10/33)10.5% (2/19)
Long- or intermediate-acting insulin49.2% (32/65)13.0% (3/23)
Sulfonylureas22.2% (4/18)10.5% (2/19)

Patients taking Korlym also experienced clinically significant improvements in body composition at week 242

BODY WEIGHT

-4.4 kg change with Korlym (95% CI: -6.3, -2.5) vs
+0.72 kg increase with placebo (95% CI: -1.8, 3.3)

BMI
-1.47 kg/m2 change with Korlym (95% CI: -2.1, -0.8) vs +0.28 kg/m2 increase with placebo (95% CI: -0.6, 1.1)
WAIST CIRCUMFERENCE
-5.2 cm change with Korlym (95% CI: -7.3, -3.2) vs
-0.1 cm change with placebo (95% CI: -2.7, 2.5)

Learn about the Korlym pivotal trial

References:
  1. Korlym Prescribing Information. Corcept Therapeutics Incorporated.
  2. DeFronzo RA, Fonseca V, Aroda VR, et al. Inadequately controlled type 2 diabetes and hypercortisolism: improved glycemia with mifepristone treatment. Diabetes Care. 2025;00(00):1-9. doi:10.2337/dc25-1055
  3. Buse JB, Kahn SE, Aroda VR, et al. Prevalence of hypercortisolism in patients with difficult-to-control type 2 diabetes. Diabetes Care. 2025;48(00):1-9. doi:10.2337/dc24-2841
  4. Data on file. CATALYST Part 2. January 2025. Corcept Therapeutics Incorporated.
  5. DeFronzo RA, Auchus RJ, Bancos I, et al. Study protocol for a prospective, multicentre study of hypercortisolism in patients with difficult-to-control type 2 diabetes (CATALYST): prevalence and treatment with mifepristone. BMJ Open. 2024;14(7):e081121. doi:10.1136/bmjopen-2023-081121