Mallinckrodt and Terumo BCT Announce Positive Recommendations for Public Funding of UVADEX® (methoxsalen) for ECP Administration with the THERAKOS® CELLEX® Photopheresis System for Treatment of Cutaneous T-Cell Lymphoma (CTCL) in Adults

– In a rare dual-review process,two independent advisory committees to the Australian Minister for Health recommend reimbursement based on a favorable clinical and cost-effectiveness comparison –

STAINES-UPON-THAMES,United Kingdom and LAKEWOOD,Colorado,July 13,2020 --Mallinckrodt plc(NYSE: MNK),a global biopharmaceutical company,and Terumo BCT,a global leader in blood component,therapeutic apheresis and cellular technologies,the exclusive distributor of the Therakos extracorporeal photopheresis (ECP) platform inAustralia,announced today that both the Medical Services Advisory Committee (MSAC) and the Pharmaceutical Benefits Advisory Committee (PBAC) recently recommended that UVADEX® (methoxsalen) for extracorporeal administration with the THERAKOS® CELLEX® Photopheresis Systembe listed on the Pharmaceutical Benefits Scheme (PBS) in Australia for the treatment of cutaneous T-cell lymphoma (CTCL) in adults.

In this two-part evaluation,the PBAC supported the cost-effectiveness of UVADEX,the pharmaceutical component of the treatment system; and the MSAC accepted the claim of superiority for safety and non-inferiority for efficacy between ECP with UVADEX and three comparators. The role of both committees is to advise the Australian Minister for Health to help inform Australian Government decisions about public funding.1 The full assessment report related to the MSAC recommendation can be found in the published public summary document. The PBAC recommendation can be found here.

UVADEX is indicated for extracorporeal administration with the THERAKOS CELLEXPhotopheresis System for the treatment of steroid–refractory and steroid–intolerant chronic graft versus host disease (cGVHD) in adults following allogeneic HSC transplantation; and for palliative treatment of the skin manifestations of CTCL that is unresponsive to other forms of treatment.

"CTCL is a rare condition with high unmet patient needs. These positive reimbursement recommendations are an important step to help ensure that UVADEX with the THERAKOS ECP system is broadly available to patients who may benefit from this treatment,"saidHugh O'Neill,Executive Vice President and Chief Commercial and Operations Officer at Mallinckrodt. "We are now working with the Australian government to finalize a public funding agreement in the coming months."

Data on the cost-effectiveness of ECP to treat CTCL was recently presented at the International Society for Pharmacoeconomics and Outcomes Research (ISPOR) annual meeting,Virtual ISPOR 2020. Results demonstrated that ECP displaced expensive pharmaceutical therapies and was associated with a higher quality of life compared with comparator treatments.2

"The MSAC and PBAC assessments are supported by data which demonstrate that THERAKOS ECP with UVADEX is a cost-effective option for the treatment of patients with CTCL in Australia,compared to other standard-of-care therapies,"2 Julia Wenner,Ph.D.,General Manager Australia,Terumo BCT Australia. "This important milestone underscores the value of this treatment option for patients with complex conditions who are unresponsive to other forms of treatment."

About Cutaneous T-Cell Lymphoma (CTCL)

Cutaneous T-cell lymphoma (CTCL) is an umbrella term for a group of non-Hodgkin lymphomas involving T lymphocytes that localize in the skin. It is a relatively rare cancer that mostly impacts men between the ages of 40 and 60 and the estimated prevalence in Australia is less than 1,200 patients.The age of onset of the condition is typically greater than 50 years,with the incidence rising significantly in the later decades of life.3CTCL causes visible skin symptoms ranging from a small rash to extensive redness,peeling,burning,soreness,and itchiness all over the body.4,5 CTCL falls into different categories based on the severity of the disease and symptoms.6

Minimum Product Information: UVADEX®(methoxsalen) Concentrated Injection for extracorporeal circulation via photopheresis (ECP)

This medicinal product is subject to additional monitoring inAustralia. This will allow quick identification of new safety information. Healthcare professionals are asked to report any suspected adverse events atwww.tga.gov.au/reporting-problems.

IndicationsinAustralia:UVADEX (methoxsalen) is indicated for extracorporeal administration with the THERAKOS CELLEX Photopheresis System for the:

treatment of steroid–refractory and steroid–intolerant chronic graft versus host disease (cGVHD) in adults following allogeneic HSC transplantation.

palliative treatment of the skin manifestations of cutaneous T-cell lymphoma (CTCL) that is unresponsive to other forms of treatment.

Contraindications:History of idiosyncratic or hypersensitivity reaction to methoxsalen,psoralen compounds or any excipients of UVADEX; co–existing melanoma,basal cell or squamous cell skin carcinoma; lactation; aphakia. ECP procedure contra-indications: Photosensitive disease; inability to tolerate extracorporeal volume loss; WBC count > 25,000 mm3; previous splenectomy; coagulation disorders.Special warnings and precautions:Only physicians who have special competence in the diagnosis and treatment of cGVHD and CTCL who have special training and experience with the THERAKOS CELLEX Photopheresis System should use UVADEX. Psoralen and ultraviolet radiation therapy should be under constant supervision of such a physician. Because of the possibilities of ocular damage,the patient should be fully informed by the physician of the risks inherent in this therapy. UVADEX should only be used ex vivo and administered directly into the photoactivation bag. Visually inspect for haemolysis. In the event of unscheduled damage to the blood during the photopheresis procedure (e.g. >43ºC alarm sounding),the fractionated blood should only be reinfused into the patient if haemolysis has not occurred. Both Men and women being treated with UVADEX should take adequate contraceptive precautions both during and after completion of photopheresis treatment. Exposure to large doses of UVA causes cataracts in animals,an effect enhanced by the administration of oral methoxsalen. As the concentration of methoxsalen in the human lens is proportional to the serum level,the concentration will be substantially lower following ex vivo methoxsalen treatment (with UVADEX) compared to that seen following oral administration. Nonetheless,if the lens is exposed to UVA during the time methoxsalen is UVADEX Product Information / Version 6.0 11 OCT 2019 4/15 present in the lens,photochemical action may lead to an irreversible binding of methoxsalen to protein and DNA components of the lens. For this reason the patient's eyes should be protected from UVA light by wearing wrap-around,UVA-opaque sunglasses during the treatment cycle and during the following 24 hours.Following oral administration of psoralen,where serum concentrations may exceed 200 ng/mL,exposure to sunlight or ultraviolet radiation (even through window glass) may result in serious burns and,in the long–term,"premature aging" of the skin. Oral psoralens may increase the risk of skin cancer. Extracorporeal use of UVADEX is associated with much lower systemic exposure than from oral methoxsalen. The phototoxicity of UVADEX has not been characterised; as a precaution,patients should avoid exposure to sunlight during the 24 hours following photopheresis treatment.Thromboembolic events,such as pulmonary embolism and deep vein thrombosis,have been reported with UVADEX administration through photopheresis systems for treatment of patients with graft versus host disease. This product contains 4.1% w/v ethanol and each 1 mL of UVADEX contains 40.55 mg of ethanol. Caution is advised in patients with liver disease,alcoholism,epilepsy,brain injury or disease. No specific information is available for use in renal or hepatic impairment and there is no evidence for dose adjustment in the elderly. Since hepatic biotransformation is necessary for urinary excretion,this may lead to prolonged photosensitivity requiring continued precautions against exposure to sunlight beyond 24 hours following photopheresis treatment. The potential benefits of photopheresis treatment should be weighed against any possible risk before embarking on the procedure. The safety and efficacy of UVADEX have not been established in children.Use in pregnancy: Category D.Use in Lactation: UVADEX is contra-indicated.Interactions with other medicines:Effects on P450 system metabolism may affect clearance / activation of other drugs (caffeine,paracetamol) or may extend the methoxsalen half-life leading to prolonged photosensitivity in patients. Methoxsalen binding to albumin may be displaced by dicoumarol,warfarin,promethazine and tolbutamide with potential for enhanced photosensitivity. Caution when treating with concomitant photosensitising agents.Adverse effects:In the clinical trials,published information and postmarketing surveillance of UVADEX/ECP,adverse events were usually mild and transient and in most cases,related to the underlying pathology. Verycommon: diarrhoea,anaemia,nausea,headache,hypertension,sinusitis,upper respiratory tract infection,fatigue,pain in extremity,pyrexia,cough,dyspnoea,cushingoid,dry eye,photophobia,toothache,anorexia.Common: depression,lacrimation increased,abdominal pain,hypokalaemia,paraesthesia oral,pharyngolaryngeal pain,tachycardia,conjunctivitis,eye pain,visual acuity reduced,dysphagia,chills,mucosal inflammation,nasopharyngitis,contusion,blood pressure diastolic decreased,haemoglobin decreased,hyperglycaemia,hypocalcaemia,neuropathy peripheral,tremor,rash,hypotension. Additional adverse effects seen in clinical trials include vomiting,infections. Adverse events related to the ECP/CELLEX procedure – thromboembolism and severe allergic reactions,vascular access complication,vasovagal spasm,hickman catheter infection/thrombosis,hypercoagulability,haemolysis.Additional adverse events identified post-marketing: anaphylactic reaction,allergic reaction,dysgeusia,exacerbation of congestive heart failure,sepsis,endocarditis,and vomiting.Dosage and Administration: Chronic Graft versus Host Disease: Three ECPtreatments in the first week then two ECP treatments per week for at least 12 weeks,or as clinically indicated. Cutaneous T-cell Lymphoma: ECP treatment on two successive days each month for six months. Patients who show an increase in skin scores after eight treatment sessions may have their treatment schedule increased to two successive days every two weeks for the next three months. Refer to full Product Information and THERAKOS CELLEX Operator's Manual for information regarding administration.

Store below 25°C. Date of first approval:16 September 2019. Date of revision:11 October 2019.

Indications and Prescribing Information for Uvadex vary globally. Please refer to the individual country product label for complete information.

Before prescribing Uvadex,please refer to the fullProduct Informationalso available by calling+61 2 9429 3606.

ABOUT THERAKOS

Mallinckrodtis the world's only provider of approved,fully-integrated systems for administering immunomodulatory therapy through ECP. Its Therakos ECP platforms,including the latest generation THERAKOS®CELLEX®Photopheresis System,are used by academic medical centres,hospitals,and treatment centres in nearly 40 countries and have delivered more than 1 million treatments globally. For more information,please visitwww.therakos.eu.

Terumo BCT is the exclusive distributor of the Therakos ECP platform inAustralia,as well asLatin Americaand select countries inEurope. To learn more about Terumo Blood and Cell Technologies,visitwww.terumobct.com.

UVADEX (methoxsalen) and THERAKOS CELLEX Photopheresis Systems are separately approved in a number of global markets. Please refer to your local approved labelling for Uvadex and the Operator's Manual for CELLEX for more information on approved uses for specific indications.

Before administering therapy using the THERAKOS CELLEX Photopheresis System,please refer to the Operator's Manual available at +61 2 9429 3606.

ABOUTMALLINCKRODT

Mallinckrodtis 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; analgesics and gastrointestinal products. Its Specialty Generics reportable segment includes specialty generic drugs and active pharmaceutical ingredients. To learn more aboutMallinckrodt,visitwww.mallinckrodt.com.

Mallinckrodtuses 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 theU.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.

About Terumo BCT

Terumo BCT,therapeutic apheresis and cellular therapy technologies,is the only company with the unique combination of apheresis collections,manual and automated whole blood processing,and pathogen reduction technologies. We believe in the potential of blood and cells to do even more for patients than they do today. This belief inspires our innovation and strengthens our collaboration with customers.TERUMOBCT.com

CAUTIONARY STATEMENTS RELATED TO FORWARD-LOOKING STATEMENTS

This release includes forward-looking statements concerning the use of UVADEX with the THERAKOS CELLEX Photopheresis System including potential benefits associated with its use and expectations regarding the timing of actions with governmental authorities. 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 ofMallinckrodt'smost recent Annual Report on Form 10-K and other filings with theSEC,all of which are available on its website. The forward-looking statements made herein speak only as of the date hereof andMallinckrodtdoes 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.

CONTACT

Media Inquiries

Caren Begun

Green Room Communications

+1 201-396-8551

caren@greenroompr.com

Terumo Media Inquiries

Christine Romero

Terumo BCT

+1 303-205-2599

press@terumobct.com

Investor Relations

Daniel J. Speciale,CPA

Vice President,Finance and Investor Relations Officer

+1 314-654-3638

daniel.speciale@mnk.com

Mallinckrodt,the "M" brand mark and theMallinckrodt Pharmaceuticalslogo are trademarks of aMallinckrodtcompany. Other brands are trademarks of aMallinckrodtcompany or their respective owners. © 2020Mallinckrodt.07/20

References

1About MSAC. Australian Government Department of Health,Medical Services Advisory Committee. http://www.msac.gov.au/internet/msac/publishing.nsf/Content/about-msac. Accessed June 15,2020.

2Dehle F,Gennari F,Peacock A,Taylor C,Mesa Zapata OA. Cost-effectiveness of extracorporeal photopheresis for the treatment of erythrodermic (stage T4,M0) cutaneous T-cell lymphoma patients in the Australian setting. Virtual poster presented at Virtual ISPOR 2020; May 18-20,2020. https://www.ispor.org/heor-resources/presentations-database/presentation/intl2020-3182/102621.

3Kim YH,Liu HL,Mraz-Gernhard S,et al. Long-term outcome of 525 patients with mycosis fungoides and Sezary syndrome: clinical prognostic factors and risk for disease progression.Arch Dermatol. 2003;139:857–866.

4Knobler R,et al. J Eur Acad Dermatol Venereol. 2014;28 Suppl 1:1-37.

5Sokołowska-Wojdyło M,et al. Postepy Dermatol Alergol. 2015;32(5):368-383.

6Trautinger F,et al. Eur J Cancer. 2006;42(8):1014-1030.

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