Patient Characteristics and Indicators of Treatment Initiation with Repository Corticotropin Injection in Patients with Rheumatoid Arthritis: A Claims Database Analysis

Acthar® Gel Treatment for Patients with Autoimmune and Inflammatory Diseases: An Historical Perspective and Characterization of Clinical Evidence

Acthar® Gel (repository corticotropin injection) is a naturally sourced complex mixture of adrenocorticotropic hormone analogs and other pituitary peptides that is believed to have both steroidogenic and nonsteroidogenic immunomodulatory effects via activation of melanocortin receptors in various cells throughout the body. Since 1952, Acthar has been approved by the US Food and Drug Administration to treat a variety of autoimmune and inflammatory diseases. Since 2014, Mallinckrodt Pharmaceuticals has conducted a large number of preclinical, clinical, and real-world-evidence studies of Acthar for the treatment of rheumatoid arthritis, systemic lupus erythematosus, dermatomyositis and polymyositis, multiple sclerosis relapse, ophthalmic disorders, sarcoidosis, and nephrotic syndrome. To date, Acthar has been the subject of more than 500 publications, many of which demonstrate the safety and efficacy of Acthar in patients with inflammatory diseases for whom standard treatments were ineffective or intolerable. Here, we review the history of Acthar and the findings of studies that have investigated the mechanism of action, safety, efficacy, and real-world effectiveness of Acthar for the treatment of inflammatory diseases.

Real-world treatment patterns for repository corticotropin injection in patients with rheumatoid arthritis

Introduction

Repository corticotropin injection (RCI, Acthar^® Gel) is a naturally sourced mixture of adrenocorticotropic hormone analogues and other pituitary peptides with anti-inflammatory and immunomodulatory effects. In a recent clinical trial, RCI was safe and effective for the treatment of refractory rheumatoid arthritis (RA). This study aims to describe real-world use and outcomes of patients with RA who were prescribed RCI in clinical practice through retrospective analysis of an electronic medical record database.

Methods

Patients with RA who were prescribed RCI were identified through the Columbus^TM electronic medical record repository, representing approximately 100 rheumatology practices. Demographics, medications, comorbidities, disease histories, laboratory evaluations, clinical outcomes and patient-reported outcomes were evaluated from 12 months pre-RCI to 12 months post-RCI initiation.

Results

The RCI cohort (n=63) comprised predominantly white women, aged 54 years on average, at 6 years from RA diagnosis, with high disease activity at baseline according to Clinical Disease Activity Index (CDAI) and Routine Assessment of Patient Index Data 3 (RAPID3) scores. Within the 12 months pre-RCI initiation, 87% of patients were prescribed disease-modifying antirheumatic drugs and 67% were prescribed glucocorticoids. Twelve months post-RCI initiation, glucocorticoid, opioid and non-steroidal anti-inflammatory drug prescriptions decreased; disease-modifying antirheumatic drug prescriptions remained stable. Reductions in CDAI, RAPID3, physician global assessment, tender joint count, swollen joint count, and pain visual analogue scale scores were observed 12 months post-RCI initiation. Few discontinuations were due to side effects. Study limitations included small sample size and incomplete electronic medical record data.

Conclusion

These findings support the safety and effectiveness of RCI for short-term adjunctive treatment of refractory RA and provide patient-management insights from routine clinical practice.

Post Hoc Analysis of Predictors of Clinical Response to Repository Corticotropin Injection in Persistently Active Rheumatoid Arthritis

INTRODUCTION

A phase IV clinical trial confirmed the safety and efficacy of repository corticotropin injection (RCI, Acthar® Gel) in patients with refractory rheumatoid arthritis (RA) that was nonresponsive to standard-of-care therapies. The objective of this post hoc analysis was to identify baseline demographics and clinical characteristics that may be predictors of response to RCI.

METHODS

The phase IV trial was a two-part, randomized, placebo-controlled withdrawal study. Post hoc analysis was conducted with the open-label portion of the trial data, in which all 258 subjects received RCI (80 U) twice weekly for 12 weeks. Responders were subjects who achieved low disease activity (LDA) by a Disease Activity Score with 28-joint count and erythrocyte sedimentation rate (DAS28-ESR) of < 3.2 at week 12. Responders were compared with nonresponders by assessing the proportion of subjects in each group for demographics and clinical characteristics, including weight, disease duration, medical history including osteoarthritis and unrelated joint conditions, hemoglobin A1c, C-reactive protein, ESR, DAS28-ESR, Clinical Disease Activity Index (CDAI), depression, anxiety, tender joint count (TJC), and swollen joint count (SJC). Bivariate analysis followed by multiple logistic regression analysis were conducted to identify significant baseline predictors for the outcome of achieving LDA by week 12.

RESULTS

Bivariate analysis showed that RCI responders had significantly lower baseline TJC (p = 0.0310), SJC (p = 0.0018), ESR (p = 0.0487), and CDAI (p = 0.0112) and shorter RA disease duration (p = 0.0446). Subjects were less likely to achieve LDA if they had osteoarthritis (p < 0.0001), other joint-related conditions unrelated to RA (p < 0.0001), anemia (p = 0.0132), depression (p = 0.0006), or prior or concomitant use of targeted-synthetic or biologic disease-modifying antirheumatic drugs (p < 0.0001). Multiple logistic regression analysis revealed that, of the above, only ongoing osteoarthritis (p = 0.0272) or other joint-related conditions (p = 0.0193) were significant negative predictors of RCI response.

CONCLUSIONS

These results identify specific patient characteristics that may be considered predictors of positive or negative clinical response to RCI.

Post Hoc Analysis of the Correlation Between Patient-Reported Outcomes and Clinical Response to Repository Corticotropin Injection for Persistently Active Rheumatoid Arthritis

Purpose

Approximately 6% of patients with rheumatoid arthritis (RA) in the USA have refractory disease that is resistant to standard-of-care therapies. A recent phase IV clinical trial affirmed the safety and efficacy of repository corticotropin injection (RCI; Acthar® Gel) for refractory RA. This post hoc analysis of the clinical trial data assessed whether changes in clinical measures correlated with patient-reported outcome (PRO) improvements.

Methods

Data were assessed from the trial’s open-label period when patients received RCI (80 U) twice weekly for 12 weeks. Clinical assessments included hemoglobin A1c, C-reactive protein, erythrocyte sedimentation rate (ESR), total joint count (TJC), swollen joint count (SJC), Disease Activity Score with 28 joint count and ESR (DAS28-ESR), and Clinical Disease Activity Index (CDAI). PROs included pain (Visual Analog Scale), fatigue (Functional Assessment of Chronic Illness Therapy-Fatigue [FACIT-F]), disability (Health Assessment Questionnaire-Disability Index [HAQ-DI]), and activity impairment (Work Productivity and Activity Impairment [WPAI] questionnaire). Patients grouped by minimal clinically important difference (MCID) improvement vs no improvement in PROs were compared with clinical measures at week 12. Correlations were determined by multivariable linear regression analysis and standardized coefficient estimates.

Results

RCI responders, defined as patients with DAS28-ESR < 3.2 at week 12, reported significantly greater PRO improvements for pain, disability, fatigue, activity impairment, current work impairment, and overall work impairment than nonresponders. Patients with MCID improvements in all PROs showed significantly greater decreases in mean values for TJC, DAS28-ESR, and CDAI, whereas those with pain, fatigue, and disability improvements had significantly greater SJC and ESR reductions. Multivariable linear regression analysis determined that improvement from baseline in all PROs correlated with significant decreases in TJC, DAS28-ESR, and CDAI. ESR reduction significantly correlated with improvements in pain and disability, but not fatigue or WPAI.

Conclusions

These results confirm that clinical responses to RCI were directly correlated with patient perception of improvement.

Real-World Treatment Patterns and Outcomes from an Electronic Medical Records Database for Patients with Rheumatoid Arthritis Treated with Repository Corticotropin Injection

PURPOSE

Repository corticotropin injection (RCI; Acthar® Gel) is a naturally sourced mixture of adrenocorticotropic hormone analogs and other pituitary peptides that exerts anti-inflammatory and immunomodulatory properties via melanocortin receptors. RCI is approved as a short-term adjunctive therapy for rheumatoid arthritis (RA) and is typically used in patients with refractory RA. The objective of this study was to describe real-world outcomes of RA patients treated with RCI by retrospective analysis of an electronic medical records (EMR) database.

PATIENTS AND METHODS

EMR data were obtained from the United Rheumatology-Normal Integrated Community Evidence (UR-NICETM) data repository for patients who used RCI for the treatment of RA. Demographics, comorbidities, disease history, medications, and laboratory evaluations 365 days prior to and 365 days after initiation of RCI were examined.

RESULTS

The patient cohort was predominantly White females with a mean age of 60 years and high RA activity prior to RCI therapy. Clinical measures of disease severity indicated that patients had high RA activity before starting RCI therapy. Clinical Disease Activity Index (CDAI) scores were significantly reduced 365 days post-initiation of RCI. Swollen and tender joint counts and patient-reported outcomes, including Routine Assessment of Patient Index Data 3 (RAPID3), Physician Global Assessment, and patient assessment of pain severity were also significantly lower. The number of patients taking conventional synthetic (cs) disease-modifying antirheumatic drugs (DMARDs), biologic (b) DMARDs, nonsteroidal anti-inflammatory drugs (NSAIDS), and opioids decreased, as did the number of drugs tried within each class for csDMARDs, bDMARDs, NSAIDs, and glucocorticoids.

CONCLUSIONS

These findings suggest that RCI significantly improves clinical outcomes of RA and decreases the need for concomitant medications for up to 1 year following initiation of therapy. The study provides valuable insights into the use of RCI and management of these difficult-to-treat RA patients during routine clinical practice.