IMMUNOTHERAPY IMMUNOTHERAPY. 37th Annual JPMorgan Healthcare Conference

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NEXT-GENERATION NEXT GENERATION ONCOLYTIC ONCOLYTIC IMMUNOTHERAPY IMMUNOTHERAPY 37th Annual JPMorgan Healthcare Conference

2 Safe harbor Any statements contained herein that are not statements of historical facts may be deemed to be forwardlooking statements which are subject to risks and uncertainties. Accordingly, actual outcomes or results may differ materially from those indicated in these statements for many reasons, including, without limitation, risks associated with our collaborations, our clinical development activities, regulatory oversight, as well as the risks, uncertainties and other factors described under the heading "Risk Factors" in our registration statement filed on Form S-1 (including a prospectus) with the SEC which was declared effective on July 19, 2018. Our forwardlooking statements are based on beliefs, assumptions and information available to the Company only as of the date of this presentation and include, but are not limited to, statements regarding the development of our product candidates, the success of our collaborations, and/or the delay or lack of success of any of our ongoing or planned clinical trials. We undertake no obligation to publicly update such forward-looking statements to reflect subsequent events or circumstances.

3 Founded in 2015 by the ex-biovex management team Proprietary genetically armed oncolytic immunotherapy platform intended to maximally activate the immune system against a patient s cancer Oncolytic immuno-gene therapy Multiple next generation product candidates armed with 2-4 genes in or being prepared for clinical trials in combination with anti-pd1 therapy Collaboration with BMS for supply of nivolumab (ongoing 150 patient phase 1/2 trial) Collaboration with Regeneron (50:50 cost sharing + cemiplimab supply) across multiple tumor types & products (initially 240 patient randomized controlled phase 2 trial starting H1 2019) Commercial scale manufacturing capability being established IPO in July 2018 (Nasdaq: REPL); September 30 th 2018 cash balance $147.9m Headquartered near Boston, MA, labs in the UK, 52 employees

4 The most experienced oncolytic immunotherapy team ROB COFFIN Chief Executive Officer Founder & CTO at BioVex, VP at Amgen PHILIP ASTLEY-SPARKE Executive Chairman CEO BioVex, Chairman at uniqure COLIN LOVE Chief Operating Officer SVP BioVex; VP at Amgen through T- Vec BLA filing PAMELA ESPOSITO Chief Business Officer VP BD at BioVex; CBO at Ra Pharmaceuticals HOWARD KAUFMAN Chief Medical Officer World leading clinical immunooncologist; ex-sitc President SUSAN DOLEMAN VP Clinical Development Director of Clinical Operations at BioVex/Amgen for T-Vec ANNE WOODLAND SVP Regulatory & Quality VP Regulatory at BioVex; led T-Vec BLA filing for Amgen post acquisition

Response rates of approved anti-pd1 therapies 5 The problem Immune checkpoint blockade is only effective for patients with a pre-existing immune response to their cancer and whose tumors are inflamed The key problem to be addressed in immuno-oncology is how to most effectively vaccinate patients against their own tumor for the rest The rest represents the vast majority of cancer patients 1L NSCLC 1L melanoma 2L MSI-H 2L melanoma 1L bladder. 2L renal 2L bladder. 2L NSCLC. 1L SCCHN 2L liver 3L gastric

Objectives 6 Render all solid tumor patients responsive to immune checkpoint blockade Immunologically cold tumor types & patients, as well as immunologically hot Maximally vaccinate patients against their own cancer Includes neoantigens, as well as defined antigens Off the shelf approach, no patient specific information or manufacturing Potently activate both innate & adaptive immunity Potentially applicable to all solid tumor patients in combination with anti-pd1/l1

7 How can we vaccinate? Options are limited & mainly not yet proven Vaccines made from cancer cell lines or proteins commonly expressed in cancers Tested in extensively in numerous formats little evidence of activity The immunogens are generally recognized as self, & therefore not very immunogenic Vaccines made from immunogens which are uniquely present in a patient s cancer (neoantigens) Arise from the genetic mutations which accumulate in tumors Non-self should be more immunogenic Considerable current interest, but not yet clinically proven Complex manufacturing a vaccine needs to be made for each patient following sequencing of their tumor Activators of the innate immune system TLR9, STING agonists etc - early indications of clinical activity Oncolytic immunotherapy off the shelf, activates innate and adaptive immunity, induces a broad immune response to all antigens present, clinically validated Replimune believes this to be the best, most practical & versatile approach

8 Oncolytic immunotherapy The use of viruses that selectively replicate in & kill tumors to treat cancer Highly inflammatory Activates both innate and adaptive immunity Releases the full array of tumor antigens into an inflamed environment Systemically activates the immune system against the tumor & neo-antigens released Can be armed with additional genes to increase efficacy Single agent T-Vec is FDA approved for the treatment of advanced melanoma

9 Oncolytic immunotherapy is synergistic with immune checkpoint blockade Randomized controlled 198 patient phase 2 study of T-VEC + ipilimumab vs. ipilimumab alone in advanced melanoma Response rates more than doubled in combination (38% vs. 18%) No additional toxicity as compared to ipilumumab alone Chesney et al JCO, 2017 T-VEC+pembrolizumab ph1b study Ribas et al Cell 2017 170: 1109-1119 62% response rate; 33% CR rate Pembrolizumab+T-VEC currently in a >700 patient phase 3 study

10 Figure 4 Oncolytic immunotherapy turns cold tumors hot Baseline After T-VEC alone After T-VEC+ pembrolizumab T-Vec+pembrolizumab Ribas et al Cell 2017 170: 1109-1119 CRs in cold tumors &/or low CD8 density

11 objectives & vision Maximize the effectiveness of oncolytic immunotherapy through Direct tumor killing and intra-tumoral spread Immunogenicity of cell death Anti-tumor immune response generation Loading with multiple immune stimulating genes Oncolytic immuno-gene therapy Extend the utility of oncolytic immunotherapy beyond melanoma to include most solid tumor types RP1 easier indications intended first FDA approval RP2 intermediate indications RP3 more challenging indications RP4-n -? Provide the most practical & effective universal combination partners for anti-pd1/l1 drugs providing the essential tumor specific immune response without which they can t work

12 Replimune uses HSV HSV has ideal properties for oncolytic immuno-gene therapy: Biology well understood Proven safety & efficacy Includes in combination with immune checkpoint blockade Infects human tumor cells broadly, highly lytic & inflammatory, kills mainly by necrosis Potent activator of innate immunity, including through STING/cGAS & TLRs Large genome able to package multiple genes These are then delivered and expressed in the tumor and draining lymph nodes the optimal sites for anti-tumor immune response induction

13 Our Immulytic platform 1. A potent underlying HSV-1 strain RP1 Enhanced potency oncolytic immunotherapy backbone Immunologically warm/hot tumors RP2 RP1 additionally expressing anti-ctla-4 Immunologically cold tumors RP3 RP1 additionally expressing anti- CTLA-4 and co-stimulatory ligands Immunologically cold tumors There is great diversity among clinical HSV strains We tested 29 new strains & selected the most effective We have armed all of our product candidates with two to four genes encoding therapeutic proteins 2. Increased tumor killing & spread In addition to the potent cytokine GM-CSF, a modified fusogenic protein (GALV) is expressed Large bystander effect, highly immunogenic cell death Provides a substantial increase in direct tumor killing potency 3. Delivery of potent immune stimulatory proteins Focus on pathways where systemic engagement is sub-optimal CTLA-4 blockade, immune-costimulatory pathway activation Delivery directly to the tumor

Fusion enhances direct anti-tumor efficacy 14 Vehicle Virus without GALV Virus with GALV (RP1) A549 lung cancer Vehicle Virus without GALV Virus with GALV (RP1) MDA-MB-231 breast cancer 3 injections over 1week; virus dose 5x10 3 pfu

Immunogenic cell death (ICD) 15 Immunogenic cell death is necessary for the induction of an effective antitumor immune response as tumor cells die Characterized by secretion of damage-associated molecular patterns (DAMPs) DAMPs classically used to assess the level of ICD are HMGB1 secretion HMGB1 is a chromatin protein release of which is required for the optimal presentation of tumor antigens to DCs Binds to several pattern recognition receptors on APCs including TLR2 & 4 ATP secretion: ATP functions as a "find-me" signal for monocytes Cell surface calreticulin levels Calreticulin is an ER protein only present on the cell surface during ICD

ATP in sups (lum) HMGB1 (pg/ml) ATP in sups (lum) HMGB1 (pg/ml) ATP in sups (lum) HMGB1 (pg/ml) ATP in sups (lum) ATP in sups (lum) ATP in sups (lum) % CRT staining ATP in sups (lum) ATP in sups (lum) ATP in sups (lum) ATP in sups (lum) ATP in sups (lum) ATP in sups (lum) ours: 16 ours: ours: ours: 40000 30000 20000 10000 ATP release 40000 0 A375 30000 20000 10000 400000 0 A375 300000 200000 300000 200000 100000 60 0.0000 0.0001 0 A375 0.0010 0.0100 MOI 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 MOI 100000 HMGB1 release 400000 0 A375 A375 100 80 40 20 0 Fusion increases immunogenic cell death 0.0000 0.0001 0.0010 0.0100 MOI 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 RP23 (-GALV) MOI RP1 without GALV 0.1000 1.0000 0.1000 1.0000 RP17 (+GALV) RP1 3000 2000 1000 3000 0 Fadu 2000 1000 15000 10000 5000 20000 0 Fadu 15000 10000 5000 0.0000 0.0001 0 Fadu 200000 Fadu 0.0010 0.0100 MOI 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 150 MOI 0.1000 1.0000 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 100 50 MOI 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 0 FADU 15000 10000 5000 15000 0 9L 10000 5000 15000 10000 5000 25000 0 9L 20000 15000 10000 5000 0 9L 0.0000 0.0001 250000 9L 20000 0.0000 0.0001 0.0000 0.0001 0.0010 0.0100 MOI 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 MOI 0.0010 0.0100 MOI 0.1000 1.0000 0.1000 1.0000 0.0010 0.0100 0.1000 1.0000 RP23 RP1 (-GALV) without GALV RP17 (+GALV) RP23 (-GALV) RP17 (+GALV) MOI RP23 (-GALV) RP17 (+GALV) MOI RP23 (-GALV) RP1 without GALV RP1 RP1 without GALV RP1 100 80 60 40 20 0 9L RP17 (+GALV) MOI 0 0.0001 0.001 0.01 0.1 1.0 Calreticulin surface expression A375 100 80 60 40 20 0 0.00 RP1 RP17 +GALV 0.01 0.10 RP1 without GALV 0.00 CRT isotype RP23 -GALV 0.01 0.10 A375 FaDu 9L 1.5 1.5 1.5

17 RP1 treats large injected & uninjected tumors Not injected Vehicle Injected 60 50 40 30 20 10 10 20 30 40 50 60 mrp1 Immune competent rat model (dual flank) Right flank tumors injected 5x with 5x10 6 pfu 60 50 40 30 20 10 10 20 30 40 50 60 Days

18 RP1 increases CD8 T cells in injected and uninjected tumors Vehicle

19 RP1 increases CD8 T cells in injected and uninjected tumors Vehicle RP1

20 RP1: Developing for tumor types with underlying sensitivity to anti-pd1 Potential rapid path to initial approval

21 RP1 clinical strategy RP1 Phase 1 (underway) Safety confirmation & determination of dose for phase 2, all comers (N 30) Phase 2 (initiates H1 2019) Defined indications (N 30 patients per group) Phase 1/2 clinical trial in 150 patients Single agent RP1 RP1 + nivolumab* 1 Melanoma + nivolumab* 2 NMSC 3 + nivolumab* 2 Bladder cancer + nivolumab* 2 MSI-H cancers + nivolumab* 2 EXPAND PROMISING COHORTS (dependent on data & FDA input) Randomized, controlled Phase 2 clinical trial in 240 patients with CSCC Initiates H1 2019 RP1+ cemiplimab vs. cemiplimab alone # 1 Includes biomarker component to confirm MOA 2 Efficacy to be assessed by ORR, CR rate and biomarker analysis 3 Non-melanoma skin cancers * Under clinical trial collaboration & supply agreement with BMS for the supply of nivolumab # Under clinical trial collaboration agreement with Regeneron; 50:50 sharing of clinical trial costs (part of a broader collaboration under which clinical trials in additional tumor types may also be conducted)

22 CSCC intended initial path to approval RP1 4,000-9,000 US deaths annually Expected to overtake melanoma as the most lethal skin cancer Anti-PD-1 therapy active Cemiplimab (Regeneron) demonstrated 46% response rate, but low CR rate Recently FDA approved (only approved therapy) Tumors are frequently accessible for direct injection Highly mutated contain a lot of neoantigens We believe CSCC provides a rapid route to market for RP1 Preparing for a registration-directed randomized controlled phase 2 trial in collaboration with Regeneron 240 patients randomized 2:1 (RP1+ cemiplimab vs cemiplimab alone) Primary endpoint ORR, secondary endpoints including CR rate, PFS, OS

23 RP2/3: Target anti-pd1/l1 non-responsive tumor types

24 Intratumoral anti-ctla-4 & co-stimulatory pathway agonists Focus on delivery of proteins which act as the immune response is being generated RP2 RP2 RP3 Systemic antibody approaches probably don t act at the right place or the right time Potential for toxicity Delivery of anti-ctla-4 directly into the tumor Blocks Treg activation/inhibition of T cell activation at the site of immune response initiation Retain the efficacy of ipilimumab alone & in combination with anti-pd1 but reduce toxicity Potential for improved activity as compared to combination anti-ctla-4/anti-pd1 Delivery immune co-stimulatory pathway activating ligands Antibody approaches have given indications of activity, but toxic Considerable pharma interest in these pathways RP3 encodes GALV-GP-R-, anti-ctla-4, CD40L & 4-1BBL CD40L: Broadly activates both innate & adaptive immunity 4-1BBL: Promotes the expansion of cellular & memory immune responses

25 Expression of anti-mctla4 enhances efficacy RP2 Left RP1 Right Left mrp2 Right Immune competent A20 mouse tumor model Subtherapeutic dose for RP1 (5x10 4 pfu) injected 3x into the right tumor only

26 Similarly increased effects with co-stimulatory pathway ligands RP3 Left RP1 Right Left mcd40l Right Left m4-1bbl Right

27 Intratumoral anti-ctla-4 & co-stimulatory pathway agonists Focus on delivery of proteins which act as the immune response is being generated Systemic antibody approaches probably don t act at the right place or the right time Potential for toxicity RP2 - On track to enter the clinic H1 2019 RP2 Delivery of anti-ctla-4 directly into the tumor Blocks Treg activation/inhibition of T cell activation at the site of immune response initiation Retain the efficacy of ipilimumab alone & in combination with anti-pd1 but reduce toxicity Potential for improved activity as compared to combination anti-ctla-4/anti-pd1 RP3 - On track to enter the clinic H1 2020 Delivery immune co-stimulatory pathway activating ligands Antibody approaches have given indications of activity, but toxic Considerable pharma interest in these pathways RP3 encodes GALV-GP-R-, anti-ctla-4, CD40L & 4-1BBL CD40L: Broadly activates both innate & adaptive immunity 4-1BBL: Promotes the expansion of cellular & memory immune responses

28 Critical focus on manufacturing Product candidates currently manufactured by a CMO for ongoing clinical development For later stage development & commercialization, in-house manufacturing is preferable The team has extensive manufacturing experience 63,000 ft 2 manufacturing facility leased in July 2018 in Framingham, MA, appropriate for multiproduct production intended to include translational biomarker lab Expected to be on-line to produce clinical product in H1 2020 * * Rendered depiction of the intended final facility

29 Key target milestones RP1 H1 2019: Initiate phase 2 in 4 tumor types in combination with nivolumab H1 2019: Initiate 240 patient registration directed phase 2 in CSCC H2 2019: Phase 1 data RP1 alone & RP1+ nivolumab H2 2020: RP1+nivolumab Phase 2 data 2021: Randomized controlled Phase 2 data in CSCC 2019 2020 2021 H1 2020: Manufacturing facility operational H1 2019: Initiate Phase 1 with RP2 +/- anti-pd1 followed by Phase 2 in three tumor types H1 2020: Initiate clinical development of RP3 H1 2020: RP2 Phase 1 data 2021: RP2 Phase 2 data RP2 RP3

30 Maximally activating the immune system against cancer Multi-product candidate oncolytic immunotherapy platform company Broad clinical development program underway RP1 intended to enter a registration-directed 240 patient phase 2 clinical trial in cutaneous squamous cell carcinoma (CSCC) in H1 2019 (collaboration with Regeneron) RP1 being studied in an additional four tumor types in an ongoing 150 patient phase 1/2 clinical trial combining with nivolumab (collaboration with BMS) RP2 & RP3 for PD-1/L1 less responsive tumors expected to enter the clinic in 2019/20 Further product candidates intended Commercial scale manufacturing capability being established Aim to become a universal combination partner for PD-1/L1 therapies potentially applicable to all solid tumors