News Release

Mallinckrodt to Present Open-Label Results from Phase 4 Acthar® Gel (Repository Corticotropin Injection) Clinical Trial in Patients with Rheumatoid Arthritis at Annual European Congress of Rheumatology (EULAR 2019)

-- Company also announces completion of controlled, double-blind, randomized phase (n=154; open-label phase, n=259) of multicenter study -
-- Primary end point of the study was the proportion of patients reaching low disease activity (by DAS28-ESR) at 12 weeks; a secondary end point was the proportion of patients maintaining low disease activity at 24 weeks --

STAINES-UPON-THAMES, United Kingdom, May 2, 2019 /PRNewswire/ -- Mallinckrodt plc (NYSE: MNK), a leading global specialty pharmaceutical company, has completed the controlled, double-blind, randomized second phase of the ongoing Phase 4, multicenter study assessing the efficacy and safety of Acthar® Gel in patients with persistently active rheumatoid arthritis (RA) who were previously treated with disease-modifying anti-rheumatic drugs (DMARDs) and corticosteroids. Full open-label results for the trial have been accepted for presentation at the Annual European Congress of Rheumatology (EULAR 2019) in Madrid in June. Due to timing of completion, presentation of the controlled, double-blinded study phase results is targeted for a research conference in the coming months.

Acthar Gel is U.S. Food and Drug Administration (FDA)-approved as adjunctive therapy for short-term administration (to tide the patient over an acute episode or exacerbation) in RA including juvenile RA (selected cases may require low-dose maintenance therapy).

"We are very pleased that the double-blinded, withdrawal phase of this important Acthar clinical trial has been completed, a study designed to give prescribers and payers important clinical information on appropriate RA patients, dosing and duration in a large, randomized, placebo-controlled, multicenter trial," said Steven Romano, M.D., Executive Vice President and Chief Scientific Officer at Mallinckrodt. "Mallinckrodt looks forward to presenting the open-label RA trial data at the upcoming EULAR conference and sharing the details with providers. We also look forward to sharing the double-blinded portion of the results in the coming months, and we remain committed to working toward meeting the needs of underserved rheumatology patients."

About the Study
The study was a Phase 4, multicenter, two-part study assessing the efficacy and safety of Acthar Gel in adult subjects with RA with persistently active disease who were previously treated with corticosteroids and conventional synthetic and/or biologic DMARDs. The primary endpoint of the study was the proportion of patients reaching low disease activity at 12 weeks. The secondary endpoints were (1) to assess the safety and tolerability of Acthar Gel in subjects with RA with persistently active disease and (2) the proportion of participants with low disease activity at 24 weeks.

Part 1 of the study was an open-label period (n=259). After 12 weeks of treatment with Acthar Gel, subjects were evaluated for treatment response using the DAS28-ESR1. In Part 2 of the study (n=154), participants who achieved low disease activity of DAS28-ESR <3.2 at week 12  in Part 1 entered a double-blind period, randomized in a 1:1 ratio to receive either Acthar Gel or matching placebo for an additional 12 weeks.

Find more information about the study here on the website.

About Rheumatoid Arthritis
RA is an autoimmune disease. It is a chronic condition that causes pain, stiffness, and swelling of the joints—all symptoms caused by inflammation.2 An estimated 1.5 million U.S. adults are living with RA.3 Treatment is aimed at stopping inflammation to put the disease in remission and relieve symptoms.4 Nonsteroidal anti-inflammatory drugs are used to ease symptoms whereas corticosteroids, disease-modifying anti-rheumatic drugs and biologics are used to slow down the disease activity.

Acthar Gel (repository corticotropin injection) Indications
Acthar Gel is an injectable drug approved by the FDA for the treatment of 19 indications. Of these, today the majority of Acthar use is in these indications:

  • Adjunctive therapy for short-term administration (to tide the patient over an acute episode or exacerbation) in rheumatoid arthritis, including juvenile rheumatoid arthritis (selected cases may require low-dose maintenance therapy)
  • Monotherapy for the treatment of infantile spasms in infants and children under 2 years of age
  • Treatment during an exacerbation or as maintenance therapy in selected cases of systemic lupus erythematosus
  • The treatment of acute exacerbations of multiple sclerosis in adults. Controlled clinical trials have shown Acthar Gel to be effective in speeding the resolution of acute exacerbations of multiple sclerosis. However, there is no evidence that it affects the ultimate outcome or natural history of the disease
  • Inducing a diuresis or a remission of proteinuria in nephrotic syndrome without uremia of the idiopathic type or that due to lupus erythematosus
  • Treatment during an exacerbation or as maintenance therapy in selected cases of systemic dermatomyositis (polymyositis)
  • The treatment of symptomatic sarcoidosis
  • Treatment of severe acute and chronic allergic and inflammatory processes involving the eye and its adnexa such as: keratitis, iritis, iridocyclitis, diffuse posterior uveitis and choroiditis, optic neuritis, chorioretinitis, anterior segment inflammation



  • Acthar should never be administered intravenously
  • Administration of live or live attenuated vaccines is contraindicated in patients receiving immunosuppressive doses of Acthar
  • Acthar is contraindicated where congenital infections are suspected in infants
  • Acthar is contraindicated in patients with scleroderma, osteoporosis, systemic fungal infections, ocular herpes simplex, recent surgery, history of or the presence of a peptic ulcer, congestive heart failure, uncontrolled hypertension, primary adrenocortical insufficiency, adrenocortical hyperfunction or sensitivity to proteins of porcine origins

Warnings and Precautions

  • The adverse effects of Acthar are related primarily to its steroidogenic effects
  • Acthar may increase susceptibility to new infection or reactivation of latent infections
  • Suppression of the hypothalamic-pituitary-axis (HPA) may occur following prolonged therapy with the potential for adrenal insufficiency after withdrawal of the medication. Adrenal insufficiency may be minimized by tapering of the dose when discontinuing treatment. During recovery of the adrenal gland patients should be protected from the stress (e.g. trauma or surgery) by the use of corticosteroids. Monitor patients for effects of HPA suppression after stopping treatment
  • Cushing's syndrome may occur during therapy but generally resolves after therapy is stopped. Monitor patients for signs and symptoms
  • Acthar can cause elevation of blood pressure, salt and water retention, and hypokalemia. Blood pressure, sodium and potassium levels may need to be monitored
  • Acthar often acts by masking symptoms of other diseases/disorders. Monitor patients carefully during and for a period following discontinuation of therapy
  • Acthar can cause GI bleeding and gastric ulcer. There is also an increased risk for perforation in patients with certain gastrointestinal disorders. Monitor for signs of bleeding
  • Acthar may be associated with central nervous system effects ranging from euphoria, insomnia, irritability, mood swings, personality changes, and severe depression, and psychosis. Existing conditions may be aggravated
  • Patients with comorbid disease may have that disease worsened. Caution should be used when prescribing Acthar in patients with diabetes and myasthenia gravis
  • Prolonged use of Acthar may produce cataracts, glaucoma and secondary ocular infections. Monitor for signs and symptoms
  • Acthar is immunogenic and prolonged administration of Acthar may increase the risk of hypersensitivity reactions. Neutralizing antibodies with chronic administration may lead to loss of endogenous ACTH activity
  • There is an enhanced effect in patients with hypothyroidism and in those with cirrhosis of the liver
  • Long-term use may have negative effects on growth and physical development in children. Monitor pediatric patients
  • Decrease in bone density may occur. Bone density should be monitored for patients on long-term therapy
  • Pregnancy Class C: Acthar has been shown to have an embryocidal effect and should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus

Adverse Reactions

  • Common adverse reactions for Acthar are similar to those of corticosteroids and include fluid retention, alteration in glucose tolerance, elevation in blood pressure, behavioral and mood changes, increased appetite and weight gain
  • Specific adverse reactions reported in IS clinical trials in infants and children under 2 years of age included: infection, hypertension, irritability, Cushingoid symptoms, constipation, diarrhea, vomiting, pyrexia, weight gain, increased appetite, decreased appetite, nasal congestion, acne, rash, and cardiac hypertrophy. Convulsions were also reported, but these may actually be occurring because some IS patients progress to other forms of seizures and IS sometimes mask other seizures, which become visible once the clinical spasms from IS resolve

Other adverse events reported are included in the full Prescribing Information.
Please see full Prescribing Information.

Mallinckrodt is a global business consisting of multiple wholly owned subsidiaries that develop, manufacture, market and distribute specialty pharmaceutical products and therapies. The company's Specialty Brands reportable segment's areas of focus include autoimmune and rare diseases in specialty areas like neurology, rheumatology, nephrology, pulmonology and ophthalmology; immunotherapy and neonatal respiratory critical care therapies; and analgesics. Its Specialty Generics and Amitiza® reportable segment includes specialty generic drugs, active pharmaceutical ingredients and AMITIZA (lubiprostone). To learn more about Mallinckrodt, visit

Mallinckrodt uses its website as a channel of distribution of important company information, such as press releases, investor presentations and other financial information. It also uses its website to expedite public access to time-critical information regarding the company in advance of or in lieu of distributing a press release or a filing with the U.S. Securities and Exchange Commission (SEC) disclosing the same information. Therefore, investors should look to the Investor Relations page of the website for important and time-critical information. Visitors to the website can also register to receive automatic e-mail and other notifications alerting them when new information is made available on the Investor Relations page of the website.

This release includes forward-looking statements concerning Acthar Gel including expectations with regard to the study described in this release. The statements are based on assumptions about many important factors, including the following, which could cause actual results to differ materially from those in the forward-looking statements: satisfaction of regulatory and other requirements; actions of regulatory bodies and other governmental authorities; changes in laws and regulations; issues with product quality, manufacturing or supply, or patient safety issues; and other risks identified and described in more detail in the "Risk Factors" section of Mallinckrodt's most recent Annual Report on Form 10-K and other filings with the SEC, all of which are available on its website. The forward-looking statements made herein speak only as of the date hereof and Mallinckrodt does not assume any obligation to update or revise any forward-looking statement, whether as a result of new information, future events and developments or otherwise, except as required by law.

Daniel Yunger
Kekst CNC

Investor Relations
Daniel J. Speciale, CPA
Vice President, Investor Relations and IRO

1. DAS28-ESR=Disease Activity Score with 28 joint count and Erythrocyte Sedimentation Rate
2. Mayo Clinic website. Rheumatoid Arthritis. Overview. Available at: Accessed October 11, 2018. 
3. What is Rheumatoid Arthritis? Arthritis Foundation. Available at: Accessed September 10, 2018.
4. Arthritis Foundation. Rheumatoid Arthritis Treatment. Available at: Accessed September 10, 2018.

Mallinckrodt, the "M" brand mark and the Mallinckrodt Pharmaceuticals logo are trademarks of a Mallinckrodt company. Other brands are trademarks of a Mallinckrodt company or their respective owners. © 2019 Mallinckrodt. US-1900598 5/19


Cision View original content to download multimedia:

SOURCE Mallinckrodt plc