Legend Biotech to Demonstrate Progress in Advancing Potential Treatment Options for Patients with Multiple Myeloma at ASCO and EHA Annual Meetings Eight presentations at ASCO and EHA 2023 Annual Meetings showcase continu

Eight presentations at ASCO and EHA 2023 Annual Meetings showcase continued leadership in CAR-T cell therapy research for patients with multiple myeloma across various clinical settings

First analysis from the CARTITUDE-4 Phase 3 study in relapsed and lenalidomide-refractory multiple myeloma patients with one to three earlier lines of therapy to be presented as an oral presentation at ASCO and in a plenary session at

Data from the final analysis of the CARTITUDE-1 study

SOMERSET, N.J.--(BUSINESS WIRE)--May 16, 2023--Legend Biotech Corporation ("Legend Biotech" or the "Company") (NASDAQ: LEGN), a global biotechnology company developing, manufacturing and commercializing novel therapies to treat

life-threatening diseases, today announced that new and updated data from the CARTITUDE Clinical Development Program evaluating ciltacabtagene autoleucel (cilta-cel) will be presented at the 2023 American Society of Clinical Oncology (ASCO)

Annual Meeting and the European Hematology Association's (EHA) 2023 Hybrid Congress. Five-year follow-up data from Legend-2 (NCT03090659), an investigator-initiated trial that has been assessing a similar CAR construct since 2015, will also be

presented at the meetings.

From the CARTITUDE Clinical Development Program, the first analysis of the Phase 3 CARTITUDE-4 study was accepted as a late breaking abstract at ASCO and will be presented as an oral presentation at both ASCO and in a plenary session at EHA.

CARTITUDE-4 (NCT04181827) is the first international, randomized, open-label Phase 3 study investigating the treatment of adult patients with relapsed and lenalidomide-refractory multiple myeloma who have received cilta-cel vs standard-of-care

regimens, including pomalidomide, bortezomib and dexamethasone (PVd) or daratumumab, pomalidomide and dexamethasone (DPd), following one to three prior lines of therapy.

"We are pleased that the latest data from the CARTITUDE-4 study will be officially presented at the meetings. We are continuing to investigate cilta-cel in earlier lines of treatment and the readout from this study is crucial to how we move

forward," said Ying Huang, Ph.D., Chief Executive Officer of Legend Biotech. "We also eagerly anticipate the presentation of the five-year follow-up data from Legend-2 at ASCO. This was the study that showed - in front of the international

community back in 2017 -promising results in heavily pretreated patients with multiple myeloma. Since then, we have taken significant steps toward advancing the treatment landscape for myeloma patients in the CARTITUDE Development Program and

are exploring the potential of other agents in our pipeline for this and other indications."

Additional data at this year's meetings will include longer-term results from the final protocol-specified analysis of the CARTITUDE-1 study (NCT03548207), which will be shared as a poster presentation at ASCO and an oral presentation at EHA.

CARTITUDE-1 is a Phase 1b/2 study evaluating cilta-cel for the treatment of heavily pretreated patients with relapsed or refractory multiple myeloma. The study's 18-month follow-up data supported the U.S. Food and Drug Administration (FDA)

approval of CARVYKTI (ciltacabtagene autoleucel; cilta-cel) in February 2022.

Data from the 5-year follow-up analysis of LEGEND-2 will be presented as a poster at ASCO and EHA. This first-in-human, Phase 1 study evaluates LCAR-B38M CAR-T cells in patients with relapsed and refractory multiple myeloma. It is the longest

follow-up for any BCMA-targeted CAR-T cell therapy study to be presented at the meetings.

A select list of abstracts from the meetings can be found below.

ASCO Presentations (June 2-6, 2023)

EHA Presentations (June 8-11, 2023)

ABOUT CARVYKTI (CILTACABTAGENE AUTOLEUCEL; CILTA-CEL)

Ciltacabtagene autoleucel is a BCMA-directed, genetically modified autologous T-cell immunotherapy, which involves reprogramming a patient's own T-cells with a transgene encoding a chimeric antigen receptor (CAR) that identifies and

eliminates cells that express BCMA. BCMA is primarily expressed on the surface of malignant multiple myeloma B-lineage cells, as well as late-stage B-cells and plasma cells. The cilta-cel CAR protein features two BCMA-targeting single domain

antibodies designed to confer high avidity against human BCMA. Upon binding to BCMA-expressing cells, the CAR promotes T-cell activation, expansion, and elimination of target cells.1

In December 2017, Legend Biotech entered into an exclusive worldwide license and collaboration agreement with Janssen Biotech, Inc. (Janssen) to develop and commercialize cilta-cel.

In February 2022, cilta-cel was approved by the U.S. Food and Drug Administration (FDA) under the brand name CARVYKTI for the treatment of adults with relapsed or refractory multiple myeloma.2 In May 2022, the European

Commission (EC) granted conditional marketing authorization of CARVYKTI for the treatment of adults with relapsed and refractory multiple myeloma.3 In September 2022, Japan's Ministry of Health, Labour and Welfare (MHLW)

approved CARVYKTI .4 Cilta-cel was granted Breakthrough Therapy Designation in the U.S. in December 2019 and in China in August 2020. In addition, cilta-cel received a PRIority MEdicines (PRIME) designation from the

European Commission in April 2019. Cilta-cel also received Orphan Drug Designation from the U.S. FDA in February 2019, from the European Commission in February 2020, and from the Pharmaceuticals and Medicinal Devices Agency (PMDA) in Japan in

June 2020. In March 2022, the European Medicines Agency's Committee for Orphan Medicinal Products recommended by consensus that the orphan designation for cilta-cel be maintained on the basis of clinical data demonstrating improved and

sustained complete response rates following treatment.5

CARTITUDE-1 (NCT03548207) is a Phase 1b/2, open-label, single arm, multi-center trial evaluating cilta-cel for the treatment of adult patients with relapsed or refractory multiple myeloma, who previously received at least three prior lines of

therapy including a proteasome inhibitor (PI), an immunomodulatory agent (IMiD) and an anti-CD38 monoclonal antibody. Of the 97 patients enrolled in the trial, 99 percent were refractory to the last line of treatment and 88 percent were

triple-class refractory, meaning their cancer did not respond, or no longer responds, to an IMiD, a PI and an anti-CD38 monoclonal antibody.

CARTITUDE-4 (NCT04181827) is the first international, randomized, open-label Phase 3 study evaluating the efficacy and safety of cilta-cel versus pomalidomide, bortezomib and dexamethasone (PVd) or daratumumab, pomalidomide and dexamethasone

(DPd) in adult patients with relapsed and lenalidomide-refractory multiple myeloma who received one to three prior lines of therapy.

LEGEND-2 (NCT03090659) is a single arm, open-label, multi-center, Phase 1/2 study, to determine the safety and efficacy of LCAR-B38M CAR-T cells in treating patients diagnosed with refractory/relapsed multiple myeloma.

LocoMMotion (NCT04035226) is a prospective, multinational, observational study of real-life current standards of care in patients with relapsed and/or refractory multiple myeloma who received at least 3 prior lines of therapy including a PI,

IMiD and CD38 monoclonal antibody treatment.

ABOUT MULTIPLE MYELOMA

Multiple myeloma is an incurable blood cancer that starts in the bone marrow and is characterized by an excessive proliferation of plasma cells.6 In 2023, it is estimated that more than 35,000 people will be diagnosed with multiple

myeloma, and more than 12,000 people will die from the disease in the U.S.7 While some patients with multiple myeloma have no symptoms at all, most patients are diagnosed due to symptoms that can include bone problems, low blood

counts, calcium elevation, kidney problems or infections.8 Although treatment may result in remission, unfortunately, patients will most likely relapse.9 Patients who relapse after treatment with standard therapies,

including protease inhibitors, immunomodulatory agents, and an anti-CD38 monoclonal antibody, have poor prognoses and few treatment options available.10,11

CARVYKTI INDICATIONS AND USAGE

CARVYKTI (ciltacabtagene autoleucel) is a B-cell maturation antigen (BCMA)-directed genetically modified autologous T cell immunotherapy indicated for the treatment of adult patients with relapsed or refractory multiple myeloma,

after four or more prior lines of therapy, including a proteasome inhibitor, an immunomodulatory agent, and an anti-CD38 monoclonal antibody.

CARVYKTI IMPORTANT SAFETY INFORMATION

WARNINGS AND PRECAUTIONS

Cytokine Release Syndrome (CRS), including fatal or life-threatening reactions, occurred following treatment with CARVYKTI in 95% (92/97) of patients receiving ciltacabtagene autoleucel. Grade 3 or higher CRS (2019 ASTCT

grade) occurred in 5% (5/97) of patients, with Grade 5 CRS reported in 1 patient. The median time to onset of CRS was 7 days (range: 112 days). The most common manifestations of CRS included pyrexia (100%), hypotension (43%), increased

aspartate aminotransferase (AST) (22%), chills (15%), increased alanine aminotransferase (ALT) (14%) and sinus tachycardia (11%). Grade 3 or higher events associated with CRS included increased AST and ALT, hyperbilirubinemia, hypotension,

pyrexia, hypoxia, respiratory failure, acute kidney injury, disseminated intravascular coagulation and hemorrhage, HLH/MAS, angina pectoris, supraventricular and ventricular tachycardia, malaise, myalgias, increased Creactive protein, ferritin,

blood alkaline phosphatase and gamma-glutamyl transferase.

Identify CRS based on clinical presentation. Evaluate for and treat other causes of fever, hypoxia and hypotension. CRS has been reported to be associated with findings of HLH/MAS, and the physiology of the syndromes may overlap. HLH/MAS is a

potentially life-threatening condition. In patients with progressive symptoms of CRS or refractory CRS despite treatment, evaluate for evidence of HLH/MAS. One patient with CRS and suspected HLH/MAS developed a fatal retroperitoneal hemorrhage

in the setting of thrombocytopenia, coagulopathy and anticoagulation.

Sixty-nine of 97 (71%) patients received tocilizumab and/or a corticosteroid for CRS after infusion of ciltacabtagene autoleucel. Forty-four (45%) patients received only tocilizumab, of whom 33 (34%) received a single dose and 11 (11%)

received more than one dose; 24 patients (25%) received tocilizumab and a corticosteroid, and one patient (1%) received only corticosteroids. Ensure that a minimum of two doses of tocilizumab are available prior to infusion of CARVYKTI .

Monitor patients at least daily for 10 days following CARVYKTI infusion at a REMS-certified healthcare facility for signs and symptoms of CRS. Monitor patients for signs or symptoms of CRS for at least 4 weeks after infusion. At

the first sign of CRS, immediately institute treatment with supportive care, tocilizumab, or tocilizumab and corticosteroids.

Counsel patients to seek immediate medical attention should signs or symptoms of CRS occur at any time.

Neurologic toxicities, which may be severe, life-threatening or fatal, occurred following treatment with CARVYKTI . Neurologic toxicities included ICANS, neurologic toxicity with signs and symptoms of parkinsonism,

Guillain-Barr Syndrome, immune mediated myelitis, peripheral neuropathies, and cranial nerve palsies. Counsel patients on the signs and symptoms of these neurologic toxicities, and on the delayed nature of onset of some of these toxicities.

Instruct patients to seek immediate medical attention for further assessment and management if signs or symptoms of any of these neurologic toxicities occur at any time.

Overall, one or more subtypes of neurologic toxicity described below occurred following ciltacabtagene autoleucel in 26% (25/97) of patients, of which 11% (11/97) of patients experienced Grade 3 or higher events. These subtypes of neurologic

toxicities were also observed in two ongoing studies.

Immune Effector Cell-Associated Neurotoxicity Syndrome (ICANS): Patients may experience fatal or life-threatening ICANS following treatment with CARVYKTI , including before CRS onset, concurrently with

CRS, after CRS resolution, or in the absence of CRS. ICANS occurred in 23% (22/97) of patients receiving ciltacabtagene autoleucel including Grade 3 or 4 events in 3% (3/97) and Grade 5 (fatal) events in 2% (2/97). The median time to onset of

ICANS was 8 days (range 1-28 days). All 22 patients with ICANS had CRS. The most frequent ( 5%) manifestation of ICANS included encephalopathy (23%), aphasia (8%) and headache (6%).

Monitor patients at least daily for 10 days following CARVYKTI infusion at the REMS-certified healthcare facility for signs and symptoms of ICANS. Rule out other causes of ICANS symptoms. Monitor patients for signs or symptoms of

ICANS for at least 4 weeks after infusion and treat promptly. Neurologic toxicity should be managed with supportive care and/or corticosteroids as needed.

Parkinsonism: Of the 25 patients in the CARTITUDE-1 study experiencing any neurotoxicity, five male patients had neurologic toxicity with several signs and symptoms of parkinsonism, distinct from immune effector

cell-associated neurotoxicity syndrome (ICANS). Neurologic toxicity with parkinsonism has been reported in other ongoing trials of ciltacabtagene autoleucel. Patients had parkinsonian and non-parkinsonian symptoms that included tremor,

bradykinesia, involuntary movements, stereotypy, loss of spontaneous movements, masked facies, apathy, flat affect, fatigue, rigidity, psychomotor retardation, micrographia, dysgraphia, apraxia, lethargy, confusion, somnolence, loss of

consciousness, delayed reflexes, hyperreflexia, memory loss, difficulty swallowing, bowel incontinence, falls, stooped posture, shuffling gait, muscle weakness and wasting, motor dysfunction, motor and sensory loss, akinetic mutism, and frontal

lobe release signs. The median onset of parkinsonism in the 5 patients in CARTITUDE-1 was 43 days (range 15-108) from infusion of ciltacabtagene autoleucel.

Monitor patients for signs and symptoms of parkinsonism that may be delayed in onset and managed with supportive care measures. There is limited efficacy information with medications used for the treatment of Parkinson's disease, for the

improvement or resolution of parkinsonism symptoms following CARVYKTI treatment.

Guillain-Barr Syndrome: A fatal outcome following Guillain-Barr Syndrome (GBS) has occurred in another ongoing study of ciltacabtagene autoleucel despite treatment with intravenous immunoglobulins. Symptoms

reported include those consistent with Miller-Fisher variant of GBS, encephalopathy, motor weakness, speech disturbances and polyradiculoneuritis.

Monitor for GBS. Evaluate patients presenting with peripheral neuropathy for GBS. Consider treatment of GBS with supportive care measures and in conjunction with immunoglobulins and plasma exchange, depending on severity of GBS.

Immune Mediated Myelitis: Grade 3 myelitis has occurred 25 days following treatment in another ongoing study. Symptoms reported included hypoesthesia of the lower extremities and the lower abdomen with impaired

sphincter control. Symptoms improved with the use of corticosteroids and intravenous immune globulin. Myelitis was ongoing at the time of death from other cause.

Peripheral Neuropathy: Six patients in CARTITUDE-1 developed peripheral neuropathy. These neuropathies presented as sensory, motor or sensorimotor neuropathies. Median time of onset of symptoms was 62 days (range

4-136 days), median duration of peripheral neuropathies was 256 days (range 2-465 days) including those with ongoing neuropathy. Patients who experienced peripheral neuropathy also experienced cranial nerve palsies or GBS in other ongoing

trials of ciltacabtagene autoleucel. Monitor patients for signs and symptoms of peripheral neuropathies.

Cranial Nerve Palsies: Three patients (3.1%) experienced cranial nerve palsies in CARTITUDE-1. All three patients had 7th cranial nerve palsy; one patient had 5th cranial nerve palsy as

well. Median time to onset was 26 days (range 21-101 days) following infusion of ciltacabtagene autoleucel. Occurrence of 3rd and 6th cranial nerve palsy, bilateral 7th cranial nerve palsy, worsening of cranial

nerve palsy after improvement, and occurrence of peripheral neuropathy in patients with cranial nerve palsy have also been reported in ongoing trials of ciltacabtagene autoleucel. Monitor patients for signs and symptoms of cranial nerve

palsies. Consider management with systemic corticosteroids, depending on the severity and progression of signs and symptoms.

Hemophagocytic Lymphohistiocytosis (HLH)/Macrophage Activation Syndrome (MAS): Fatal HLH occurred in one patient (1%), 99 days after ciltacabtagene autoleucel. The HLH event was preceded by prolonged CRS lasting 97 days. The

manifestations of HLH/MAS include hypotension, hypoxia with diffuse alveolar damage, coagulopathy, cytopenia, and multi-organ dysfunction, including renal dysfunction.

One patient with grade 4 HLH/MAS developed fatal intracerebral and gastrointestinal hemorrhage in the setting of coagulopathy and thrombocytopenia 12 days after treatment in another ongoing study. Patients who develop HLH/MAS have an

increased risk of severe bleeding. Monitor hematological parameters in patients with HLH/MAS and transfuse per institutional guidelines.