Global Leader in Allogeneic Cellular Medicines for Inflammatory Diseases Operational Highlights & Financial Results for the Period Ended March 31, 2022 June 2022 ASX: MSB; Nasdaq: MESO Exhibit 99.3

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation includes forward-looking statements that relate to future events or our future financial performance and involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to differ materially from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. We make such forward- looking statements pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and other federal securities laws. All statements other than statements of historical facts contained in this presentation are forward-looking statements. Words such as, but not limited to, “believe,” “expect,” “anticipate,” “estimate,” “intend,” “plan,” “targets,” “likely,” “will,” “would,” “could,” and similar expressions or phrases identify forward-looking statements. We have based these forward-looking statements largely on our current expectations and future events , recent changes in regulatory laws, and financial trends that we believe may affect our financial condition, results of operation, business strategy and financial needs. These statements may relate to, but are not limited to: expectations regarding the safety or efficacy of, or potential applications for, Mesoblast's adult stem cell technologies; expectations regarding the strength of Mesoblast's intellectual property, the timeline for Mesoblast's regulatory approval process, and the scalability and efficiency of manufacturing processes; expectations about Mesoblast's ability to grow its business and statements regarding its relationships with current and potential future business partners and future benefits of those relationships; statements concerning Mesoblast's share price or potential market capitalization; and statements concerning Mesoblast's capital requirements and ability to raise future capital, among others. Forward-looking statements should not be read as a guarantee of future performance or results, and actual results may differ from the results anticipated in these forward-looking statements, and the differences may be material and adverse. You should read this presentation together with our financial statements and the notes related thereto, as well as the risk factors, in our most recently filed reports with the SEC or on our website. Uncertainties and risks that may cause Mesoblast's actual results, performance or achievements to be materially different from those which may be expressed or implied by such statements, include, without limitation: risks inherent in the development and commercialization of potential products; uncertainty of clinical trial results or regulatory approvals or clearances; government regulation; the need for future capital; dependence upon collaborators; and protection of our intellectual property rights, among others. Accordingly, you should not place undue reliance on these forward-looking statements. We do not undertake any obligations to publicly update or revise any forward-looking statements, whether as a result of new information, future developments or otherwise.

Our Mission Mesoblast is committed to bringing to market innovative cellular medicines to treat serious and life-threatening illnesses

Platform Technology – Mechanism of Action Our mesenchymal precursor/stromal cells respond to and are activated by multiple inflammatory cytokines through surface receptors, resulting in orchestration of an anti-inflammatory cascade Effector B cell IL-1β TNFα IL-6 IL-17 Inflammation IDO (+ unknown factors) IDO, PGE2 TGF�� NK Activation Cytotoxicity PGE2 IDO, PGE2 TGF��, M-CSF, CCL2 IL-10 IDO, PGE2 IDO, TGF�� IL-10 Immature DC IL-1 IL-6 TNFα IL-10 Polarize M1 to M2 IFNγ Source: data on file

Late-Stage Clinical Pipeline JCR Pharmaceuticals Co., Ltd. (JCR), has the right to develop mesenchymal stromal cells (MSCs) in certain fields for the Japanese market, including for the treatment of hematological malignancies, such as Graft vs Host Disease, and for hypoxic ischemic encephalopathy (HIE). Mesoblast has the right to use safety and efficacy data generated by JCR to support its development and commercialization plans for remestemcel-L in the US and other major healthcare markets, including for GVHD and HIE Grünenthal has an exclusive license to develop and commercialize rexlemestrocel-L for chronic low back pain in Europe and Latin America/Caribbean Tasly Pharmaceuticals has exclusive rights for rexlemestrocel-L for the treatment or prevention of chronic heart failure in China

Rexlemestrocel-L Chronic Low Back Pain (CLBP) due to Degenerative Disc Disease (DDD) Commercialization – Market Overview Financial Results © Lonza, reproduced with permission Manufacturing Remestemcel-L for the Period Ended March 31, 2022

Financial Highlights Revenues in the quarter increased by 5% on the comparative quarter to US$2.0 million and by 46% for the nine-month period ended March 31, 2022, to US$8.0 million Net cash usage reported for operating activities in the quarter was reduced by 40%, or US$10.3 million, to US$15.5 million compared with US$25.8 million in the comparative quarter last year1 For the quarter, net cash usage reported for operating activities excluding inventory for the planned remestemcel-L product launch, was reduced by 50% to US$11.2 million from US$22.2 million in the comparative quarter For the nine-month period ended March 31, 2022, net cash usage reported for operating activities was reduced by 36%, or US$31.2 million, to US$54.8 million compared with US$86.0 million in the comparative period last year, and by 40% excluding inventory for the planned remestemcel-L product launch Cash on hand at the end of the quarter was US$76.8 million, with up to an additional US$40 million available to be drawn down from existing financing facilities subject to certain milestones 1. Accounting policy change resulted in a $1.4 million benefit in the Mar 22 quarter.

Reported Quarterly Net Operating Cash Burn has been significantly reduced US$m Reported quarterly net operating cash burn has been reduced over the last 5 quarters. Accounting policy change resulted in a $1.4 million benefit in the Mar 22 quarter.

Reduction in R&D Spend; Steady Investment in Manufacturing Decreased R&D Spend: 34% reduction ($4.2m) predominantly due to reduced spend on clinical trial activities. Steady Investment in Manufacturing: Continued build of pre-launch inventory of remestemcel-L to support the launch of SR-aGVHD. On FDA approval, remestemcel-L inventory will be recognized on the balance sheet, currently at US$29.7 million. Figures have been rounded.

Rexlemestrocel-L Chronic Low Back Pain (CLBP) due to Degenerative Disc Disease (DDD) Commercialization – Market Overview Remestemcel-L Acute Graft Versus Host Disease (aGVHD)

Acute Graft Versus Host Disease (aGVHD) Serious and Fatal Complication of Allogeneic Bone Marrow Transplantation (BMT) PHASE 1 Host Tissue Damage by BMT Conditioning PHASE 2 Immune Cell Activation & Cytokine Storm PHASE 3 Inflammation and End Organ Damage Conditioning regimen, chemotherapy, or radiation Tissue Damage Activation of CD4 & CD8 T-cells Cytokine Storm TNF, IL-1, IL-6 IFNγ, IL-2, IL-12, IL-21, IL-22, IL-23 Macrophage input to cytokine storm Macrophage Modified from Blazar et al., Nature Reviews Immunology 12: 443 – 458

1. Westin, J., Saliba, RM., Lima, M. (2011) Steroid-refractory acute GVHD: predictors and outcomes. Advances in Hematology. 2. Anthem-HealthCore/Mesoblast claims analysis (2016). Data on file 3. Niederwieser D, Baldomero H, Szer J. (2016) Hematopoietic stem cell transplantation activity worldwide in 2012 and a SWOT analysis of the Worldwide Network for Blood and Marrow Transplantation Group including the global survey. 4. HRSA Transplant Activity Report, CIBMTR, 2019 5. Axt L, Naumann A, Toennies J (2019) Retrospective single center analysis of outcome, risk factors and therapy in steroid refractory graft-versus-host disease after allogeneic hematopoietic cell transplantion. Bone Marrow Transplantation. More than 30,000 allogeneic BMTs performed globally (>20K US/EU) annually, ~20% pediatric3,4 Approx. 1,500 allogeneic BMTs in children and adolescents in US4 Remestemcel-L: Steroid-Refractory Acute Graft Versus Host Disease Significant Unmet Need with High Mortality Acute GVHD is a life-threatening complication that occurs in ~50% of patients receiving allogeneic bone marrow transplants (BMTs)1 Acute GVHD primarily affects skin, GI tract, and liver Steroid-refractory aGVHD is associated with mortality rates as high as 90%1,5 and significant extended hospital stay costs2 Treatment Options Burden of Illness Market Opportunity Corticosteroids are first-line therapy for aGVHD There is only one approved treatment for disease refractory to steroids and no approved treatment in the US for children under 12 years old In Japan, Mesoblast’s licensee has received the only product approval for SR-aGVHD in both children and adults

Remestemcel-L: Prior Clinical Data in Children with SR-aGVHD Consistent Efficacy and Safety Outcomes in a Total of 309 Children from Three Studies Remestemcel-L was used as first-line therapy in a randomized controlled Phase 3 trial of 260 patients, with SR-aGVHD, including 27 children Remestemcel-L was used as salvage therapy in an expanded access program in 241 children with SR-aGVHD, 80% of whom had Grade C/D disease, and failed institutional standard of care Remestemcel-L was used as first-line therapy in Mesoblast’s open-label Phase 3 trial in 54 children with SR-aGVHD, 89% of whom had Grade C/D disease 1. Mount Sinai Acute GVHD International Consortium (MAGIC) - a group of ten BMT centers throughout the US and Europe whose purpose is to conduct ground-breaking clinical trials in GVHD, including developing informative biorepositories that assist in developing treatments that can guide GVHD therapy; 2. Two subjects in the MAGIC cohort had follow-up <100 days; these subjects are excluded from the respective survival analyses; 3.GVHD001 had 55 randomized patients, however one patient dropped out before receiving any dose of remestemcel-L

Identifying Acute GVHD Patients at High Risk of Non-Response to Treatment and Death MAGIC Algorithm Probability Biomarker Score (MBS, MAP) > 0.29 is a Validated Threshold Major-Monfried H, et al. MAGIC biomarkers predict long-term outcomes for steroid-resistant acute GVHD. Blood 2018; 131 (25): 2846-2855

Remestemcel-L Treatment Outcomes Significantly Greater Day 28 Overall Responses and Day 180 Survival in Steroid-Refractory Patients with Baseline MAP ≥ 0.29 Kasikis S et al. Bone Marrow Transplantation 2021; 56:2869–2870. Response by Baseline MAP Survival by Baseline MAP MAP > 0.29 Remestemcel-L vs MAGIC 67% vs 10%, p = 0.01  MAP > 0.29 Remestemcel-L vs MAGIC 64% vs 10%, p = 0.01  Day 28 Non-Responder Day 28 Responder Day 180 Deceased Day 180 Alive Remestemcel-L Remestemcel-L MAGIC MAGIC MAP MAP 0.8 0.6 0.4 0.2 0.0 0.8 0.6 0.4 0.2 0.0

Remestemcel-L Treatment Outcomes Significantly Greater Survival in Steroid-Refractory Patients with Baseline MAP ≥ 0.29 Kasikis S et al. Bone Marrow Transplantation 2021; 56:2869–2870. Kaplan-Meier Estimates of 6-month Overall Survival for the Two Patient Cohorts by Baseline MAP Abbreviations: MAP: MAGIC algorithm probability; BAT: best available therapy.

Remestemcel-L: Plan for BLA Resubmission Mesoblast believes that the proposed potency assay measuring remestemcel-L’s in vitro anti-inflammatory and immunomodulatory activity helps establish a clear understanding of remestemcel-L’s mechanism of action in SR-aGVHD, and demonstrates relevance to the in vivo clinical effect of the product in the 54-patient Phase 3 trial in children with SR-aGVHD Strongest correlation between potency assay and survival seen in those patients at highest mortality risk as measured by clinical severity or high biomarker levels of inflammation Additionally, Mesoblast has now generated data from the expanded access program (EAP 275) of 241 children which confirm the ability of the in-vitro potency assay to measure product activity relevant to survival outcomes Our GMP contractor is now well resourced allowing final testing of product inventory for the BLA resubmission In preparation for the expected FDA review, Mesoblast last week completed a successful mock pre-approval inspection of its GMP manufacturing facility and process comprising both on-site and virtual inspections by external auditors Mesoblast will provide these new data to FDA and address all chemistry, manufacturing and controls (CMC) outstanding items as required for the planned BLA resubmission in the coming quarter. If the resubmission is accepted, CBER will consider the adequacy of the clinical data in the context of the related CMC issues

Rexlemestrocel-L Chronic Low Back Pain (CLBP) due to Degenerative Disc Disease (DDD) Commercialization – Market Overview Remestemcel-L Acute Respiratory Distress Syndrome (ARDS) due to COVID-19

Remestemcel-L: Acute Respiratory Distress Syndrome (ARDS) Clinical Need for Effective Treatment Remains High ARDS is caused by cytokine storm in lungs of patients infected with COVID-19 or other respiratory pathogens New COVID-19 variants are emerging globally with high infection rates ARDS remains a major cause of mortality for COVID-19 patients who are immunocompromised, unvaccinated, or with comorbidities, as well as those with seasonal influenza and other pathogens Remestemcel-L has the potential to tame the cytokine storm in ARDS and may offer a life-saving treatment for high-risk patients Mesoblast intends to move forward with the pivotal trial for EUA, with reference to the aGVHD BLA for product potency assay in place prior to trial commencement

Greatest Mortality Reduction & Improved ARDS Severity* seen in Remestemcel-L Treated Patients < 65 years Modified Intent to Treat (mITT) Patients < 65 years old (n=123) Remestemcel-L vs Control * Measured as resolution and/or improvement of ARDS as defined by the Berlin criteria at Days 7, 14, 21, and 30 post-randomizations

Remestemcel-L Plus Dexamethasone Shows Synergy in Mortality Reduction and Improvement in ARDS Severity* in Exploratory Population < 65 years old Treated Patients (mITT) < 65 years old on Dexamethasone (n=73) through 90-Days * Measured as resolution and/or improvement of ARDS as defined by the Berlin criteria at Days 7, 14, 21, and 30 post-randomizations

Remestemcel-L Plus Dexamethasone Shows Synergy in COVID ARDS Mortality Reduction Over 12 Months in Exploratory Population < 65 years old Treated Patients (ITT) < 65 years old on Dexamethasone (n=74) Through 12 Months Mortality Through 12 Months REM 17.2% (5/29) vs Control 49% (22/45) HR: 3.538 95% CI (1.338, 9.355) Log Rank p-value = 0.0063

Remestemcel-L: Regulatory Pathway to Potential EUA for COVID-19 ARDS The FDA has advised Mesoblast that an additional clinical study in COVID ARDS, if statistically positive, could provide a dataset in conjunction with the recently completed 222 patient clinical study that might be sufficient to support an emergency use authorization (EUA) FDA provided guidance that the existing COVID ARDS Investigational New Drug (IND) file and future submissions for remestemcel-L in this indication may continue to cross-reference manufacturing and potency assay information in BLA for pediatric SR-aGVHD Mesoblast is working together with investigators from a clinical trial network focused on acute lung injury at over 40 sites across the United States affiliated with Vanderbilt University Medical Center to design and implement a pivotal trial of remestemcel-L to reduce mortality in high-risk patients with ARDS

mesoblast Remestemcel-L Inflammatory Bowel Disease Ulcerative Colitis & Crohn’s Disease

1. Crohn’s and Colitis Foundation; 2. Lightner AL. Surgery for Inflammatory Bowel Disease in the ERA of Biologics. J Gastroinest Surg. 2020 Vol 24: 1430-1435; 3. CDC Facts and Figures 2015; 4. Globaldata Pharmapoint 2018; 5. Dahlhamer JM, MMWR Morb Mortal Wkly Rep. 2016;65(42):1166–1169 More than three million people (1.3%) in the US alone have inflammatory bowel disease1 Approximately 33,000 new cases of Crohn’s disease and 38,000 new cases of ulcerative colitis diagnosed every year3-5 Remestemcel-L: Inflammatory Bowel Disease Potential Localized Treatment for Ulcerative Colitis & Crohn’s Colitis Refractory to Biologics - High Unmet Need Up to 80% of patients with medically-refractory Crohn’s disease and 20% of patients with medically-refractory ulcerative colitis eventually require surgical treatment of their disease1,2 Which can have a devastating impact on quality of life Treatment Options Ulcerative Colitis Affects the colon causing inflammation of the inner lining of the bowel Burden of Illness Market Opportunity Despite recent advances, approximately 30% of patients are primarily unresponsive to anti-TNFα agents Among responders, up to 10% will lose their response to the drug every year1,2 Crohn’s Disease Can present anywhere along the GI tract – usually in lower part of small bowel and upper colon. Can penetrate through intestinal layers from inner to outer

Remestemcel-L: Ulcerative Colitis & Crohn’s Colitis Results of First Patient Cohort from Randomized Controlled Study Published in the Journal of Crohn's and Colitis The immunomodulatory effects of remestemcel-L on GI inflammation is being further evaluated in a randomized, controlled study of remestemcel-L by direct endoscopic delivery to areas of inflammation in patients with medically refractory ulcerative colitis or Crohn’s colitis A single local delivery of remestemcel-L by colonoscopy resulted in rapid mucosal healing and disease remission in these refractory patients at high risk of progression to surgery The study at Cleveland Clinic will randomize up to 48 patients with medically refractory ulcerative colitis or Crohn’s colitis in a 2:1 fashion to receive a single intervention with remestemcel-L or placebo. Medically refractory ulcerative colitis and Crohn’s colitis patients are defined as having active disease for at least 6 months and having lost response to at least one monoclonal antibody (anti-TNF or anti-integrin)

Remestemcel-L: Ulcerative Colitis & Crohn’s Colitis Results of First Patient Cohort from Randomized Controlled Study Published in the Journal of Crohn's and Colitis Key results of the interim analysis performed in the first 12 enrolled patients were as follows: All UC patients treated with remestemcel-L had improved clinical and endoscopy scores within 2 weeks, as defined by the Mayo clinical score and Mayo endoscopic severity (MES) score, and all achieved clinical and endoscopic remission by 2 weeks All UC patients were extremely satisfied or satisfied with remestemcel-L treatment at 3 months, based on the inflammatory bowel disease patient reported treatment impact (IBD-PRTI), and response was described as excellent or good in all patients All Crohn’s colitis patients treated with remestemcel-L showed treatment remissions or responses by three months, as measured by the Simple Endoscopy Score for Crohn’s Disease (SES-CD) (mean score 17 at baseline decreased to 5 at 3 months) Remestemcel-L treatment resulted in reduction of fecal calprotectin, a validated biomarker of disease activity,10 from mean of 231 at baseline to 67 at 3 months, indicative of remission In controls with UC and Crohn’s colitis over 3 months, endoscopy scores increased, fecal calprotectin levels increased from a mean of 330 to 505, and clinical responses were described as poor or unchanged

Rexlemestrocel-L Chronic Low Back Pain (CLBP) due to Degenerative Disc Disease (DDD) mesoblast

1. Williams, J., NG, Nawi, Pelzter, K. (2015) Risk factors and disability associated with low back pain in older adults in low-and middle-income countries. Results from the WHO Study on global ageing and adult health (SAGE). PloS One. 2015; 10(6): e0127880., 2. Simon, J., McAuliffe, M., Shamim, F. (2015) Discogenic Low Back Pain. Phys Med Rehabil Clin N Am 25 (2014) 305–317., 3.Decision Resources: Chronic Pain December 2015., 4. LEK & NCI opinion leader interviews, and secondary analysis., 5. Navigant: Commercial Assessment for a Proprietary Cell-Based Therapy for DDD in the U.S. and the EU3 – August 2014., 6. HealthCare Utilization and Cost of Discogenic Lower Back Pain in the US – Anthem/HealthCore. Back pain causes more disability than any other condition1 Inflicts substantial direct and indirect costs on the healthcare system,1 including excessive use of opioids in this patient population Over 7m patients are estimated to suffer from CLBP due to degenerative disc disease (DDD) in each of the U.S. and E.U.5 3,4,5 Rexlemestrocel-L A New Paradigm for Treatment of Chronic Low Back Pain due to Degenerative Disc Disease Minimal treatment options for patients with chronic low back pain (CLBP) who fail conservative therapy include opioids and surgery 50% of opioid prescriptions are for CLBP3 Durable improvement in pain has potential to reduce opioid use and prevent surgical intervention Burden of Illness Treatment Options Market Opportunity

The Patient Treatment Journey Rexlemestrocel-L Potential for First-Line CLBP associated with DDD, Refractory to Conservative Treatment Rexlemestrocel-L targeting moderate-to-severe DCLBP Epidural steroid injections (off-label) Radio frequency ablation Spinal cord stimulation Intrathecal pumps Weak opioid analgesics (e.g., tramadol) Strong opioid analgesics (e.g., oxycodone) Opioid Analgesics Interventional Therapies

McCann MR and Seguin CA. Notochord Cells in Intervertebral Disc Development and Degeneration. J. Dev. Biol. 2016, 4(1), 3 Chronic Low Back Pain Inflammation is at the Core of Degenerative Disc Disease

M1=pro-inflammatory macrophage; IL-1β=interleukin-1 beta (pro-inflammatory cytokine); TNFα=Tumour Necrosis Factor alpha (pro-inflammatory cytokine); M2=anti-inflammatory macrophage Technology Platform – Mesenchymal Precursor Cells (MPC) Potential Mechanisms of Action in Treating Inflammatory Disc Disease

Phase 3 Trial Outcomes – Rexlemestrocel-L for Chronic Low Back Pain Single Injection of Rexlemestrocel-L + HA Results in >Three Years of Pain Reduction Positive results from a single injection of MPC + Hyaluronic Acid (HA) carrier include: No appreciable differences in the safety profile of subjects treated with Rexlemestrocel-L, Rexlemestrocel-L+HA or saline control Achievement of significant and durable reductions in CLBP (mean change from baseline in back pain intensity) through 36 months across the entire evaluable study population (n=404) compared with saline controls Greatest pain reduction was observed in the pre-specified population of subjects with CLBP duration shorter than the baseline study median of 68 months (n=202) with significantly greater reduction (nominal p-value < 0.05) at all time points analyzed over 36 months compared with saline controls Significantly greater pain reduction in the pre-specified patient subset of opioid users (n=168) at all time-points compared with saline controls and by 36 months there was a significant increase in the proportion of patients that came off opioids altogether

Phase 3 Trial: Outcome LS Mean Change in Low Back Pain from Baseline - Entire Study (n=404) * * * = nominal p-value < 0.05 MPC+HA vs. Placebo All Subjects Rexlemestrocel-L+HA Demonstrated significant reductions in pain at 12 and 24 months

-10 -20 -30 -40 Month 1 Month 3 Month 6 Month 12 Month 18 Month 24 Month 36 Phase 3 Trial: Outcome LS Mean VAS Change in Low Back Pain from Baseline - Duration CLBP < 68 Month Median Baseline Duration (n=202) *** *** *** *** ** * * Nominal p-values * = p < 0.05; ** = p < 0.01; *** = p < 0.001 MPC+HA vs. Placebo Duration < Median Rexlemestrocel-L +HA Demonstrated significant reductions in pain over 36-months

Phase 3 Trial: Outcome Rexlemestrocel-L + HA Increased the Proportion of Patients with Baseline Opioid Use Who Were Not Taking an Opioid at 36 Months * = p < 0.05 MPC+HA vs. Placebo * * Opioid Users Rexlemestrocel-L+HA Significant increase in patients who came off opioids

Next Steps for Rexlemestrocel-L in Chronic Low Back Pain FDA Office of Tissues and Advanced Therapies (OTAT) agreed with Mesoblast’s proposal for mean pain reduction at 12 months to serve as the primary endpoint of the next trial, with mean functional improvement and reduction in opioid use as secondary endpoints A key objective is to demonstrate durable reduction in pain and position rexlemestrocel-L as a potential opioid-sparing agent The planned upcoming US trial will include at least 20% of subjects from the EU to support submissions to both FDA and EMA Active discussions ongoing with key investigators and advisors on final protocol design

Rexlemestrocel-L Chronic Low Back Pain (CLBP) due to Degenerative Disc Disease (DDD) Commercialization – Market Overview Rexlemestrocel-L Chronic Heart Failure with Reduced Ejection Fraction (HFrEF)

M1=pro-inflammatory macrophage; IL-6=interleukin 6 (pro-inflammatory cytokine); IL-1β=interleukin-1 beta (pro-inflammatory cytokine); TNFα=Tumour Necrosis Factor alpha (pro-inflammatory cytokine); IL-1-=interleukin 10 (anti-inflammatory cytokine); M2=anti-inflammatory macrophage Rexlemestrocel-L: Proposed Mechanism of Action Intra-Cardiac Administration in Treatment of both Heart Failure & Large Vessel Atherosclerosis Mesenchymal precursor cells (MPC) beneficially act the heart and the systemic vasculature: Reduce cardiac / systemic inflammation Reversal of endothelial dysfunction Induce microvascular networks within viable heart muscle Reduce heart muscle death Modified from Borow KM, Yaroshinsky A, Greenberg B, Perin E. Phase 3 DREAM-HF Trial of Mesenchymal Precursor Cells in Chronic Heart Failure: A Review of Biological Plausibility and Implementation of Flexible Clinical Trial Design. Circ Res. 2019;125:265-281

DREAM-HF Phase 3 Trial in HFrEF Rexlemestrocel-L Reduced Incidence of 3-Point Composite MACE - CV Death, MI or Stroke - Compared to Controls Across All 537 Treated Patients Kaplan-Meier log rank statistics MACE=Major Adverse Cardiovascular Event; TTFE=Time To First Event; MI=Myocardial Infarction (Heart Attack)

DREAM-HF Phase 3 Trial in HFrEF 3-Point Composite MACE, High-Risk Patients (Myocardial Ischemia &/or Diabetes), and Inflammation Kaplan-Meier log rank statistics REX 22/112 (19.6%) vs CTRL 39/100 (39.0%) HR 0.457 95% CI (0.270, 0.773) P-value = 0.003 Risk ↓ Due to REX = 54% Days from Day 0 Treatment Ischemic &/or Diabetics with hsCRP ≥2 (n=212) Absence of 3-Point Composite MACE REX 44/193 (22.8%) vs CTRL 67/192 (34.9%) HR 0.634 95% CI (0.434, 0.928) P-value = 0.019 Risk ↓ Due to REX = 37% MACE=Major Adverse Cardiovascular Event; TTFE=Time To First Event; IMM=Irreversible Morbidity or Mortality; hs-CRP=High-Sensitivity C-Reactive Protein (a measure of systemic inflammation)

Investigational Agents Evaluated for Cardiovascular Risk Reduction Using 3-Point IMM MACE* Comparison With Rexlemestrocel-L in Patients With Myocardial Ischemia &/or Diabetes * TTFE Composite for non-fatal MI, or non-fatal stroke, or cardiovascular death Wang CCL, et al. Circulation; 2019; 139: 1741-1743; McGuire DK, et al. JAMA Cardiology 2021; 6: 148-158

Rexlemestrocel-L: Conclusions & Key Next Steps in HFrEF Transendocardial delivery of 150 million allogeneic MPCs (rexlemestrocel-L) was safe and did not elicit any clinically meaningful immune-related responses Over a mean follow-up of 30 months, a single rexlemestrocel-L dose on top of maximal standard of care significantly reduced: Composite of cardiovascular death or non-fatal MI or non-fatal stroke in all 537 patients A hierarchical analysis of pre-specified risk stratification showed greatest benefit in patients with myocardial ischemia and/or diabetes (72% of total treated population) In controls (treated with maximal current therapies for heart failure), the presence of myocardial ischemia and/or diabetes resulted in 1.9-fold greater risk of 3-Point MACE versus other control patients with heart failure Rexlemestrocel-L reduced 3-Point MACE in myocardial ischemics and/or diabetics by 37% Greatest benefit in patients with elevated CRP at baseline with reduction in 3-Point MACE of 54% (n = 212) Mesoblast expects to receive guidance from FDA on a potential approval pathway following detailed review of the outcomes identified in high-risk HFrEF patients with diabetes and/or myocardial ischemia

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