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Full Year Results 2017 Presentation 6 MARCH, 2018

Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

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Page 1: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Full Year Results 2017 Presentation

6 MARCH, 2018

Page 2: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Forward Looking StatementsThe information contained in this presentation is being supplied and communicated to you on a confidential basis solely for your information and may not be reproduced, further distributed to any other person or published, in whole or in part, for any purpose. In accordance with the prohibition on market abuse contained in Part VIII of the Financial Services and Markets Act 2000 (as amended) (the “Act”): (i) you must not pass this information to any person; and (ii) you must not base any behaviour in relation to any securities or other Qualifying Investments (as that term is defined in the Act) which would amount to market abuse on such information until after it is made generally available.

This presentation is being communicated in the United Kingdom only to (a) persons who have professional experience in matters relating to investments falling within Article 19(1) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the “Order”) or (b) high net worth companies and other bodies falling within Article 49(2) of the Order; or (c) persons to whom this presentation may otherwise lawfully be distributed (all such persons being referred to as “relevant persons”). This presentation is only directed at relevant persons, and any investment or investment activity to which this presentation relates is only available to relevant persons or will be engaged in only with relevant persons. Solicitations resulting from this presentation will only be responded to if the person concerned is a relevant person. Other persons should not act upon this presentation or any of its contents.

The distribution of this presentation in certain jurisdictions may be restricted by law, and persons into whose possession this presentation comes should inform themselves about, and observe, any such restrictions. Although reasonable care has been taken to ensure that the facts stated in this presentation are accurate and that the opinions expressed are fair and reasonable, the contents of this presentation have not been verified by Silence Therapeutics plc (the “Company”) or any other person. Accordingly no representation or warranty, express or implied, is made as to the fairness, accuracy, completeness or correctness of the information and opinions contained in this presentation and no reliance should be placed on such information or opinions. None of the Company, or any of its respective members, directors, officers or employees nor any other person accepts any liability whatsoever for any loss howsoever arising from any use of such information or opinions or otherwise arising in connection with this presentation. No part of this presentation, or the fact of its distribution, should form the basis of or be relied upon in connection with any contract or commitment or investment decision whatsoever. This presentation does not form part of any offer of securities, or constitute a solicitation of any offer to purchase or subscribe for securities or an inducement to enter into any investment activity. Recipients of this presentation are not to construe its contents, or any prior or subsequent communications from or with the Company or its representatives as investment, legal or tax advice. In addition, this presentation does not purport to be all-inclusive or to contain all of the information that may be required to make a full analysis of any transaction. Further, the information in this presentation is not complete and may be changed. Recipients of this presentation should each make their own independent evaluation of the information and of the relevance and adequacy of the information in this document and should make such other investigations as they deem necessary.

Securities in the Company have not been, and will not be, registered under the United States Securities Act of 1933, as amended (the “Securities Act”), or qualified for sale under the law of any state or other jurisdiction of the United States of America and may not be offered or sold in the United States of America except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act. Neither the United States Securities and Exchange Commission nor any securities regulatory body of any state or other jurisdiction of the United States of America, nor any securities regulatory body of any other country or political subdivision thereof, has approved or disapproved of this presentation or the securities discussed herein or passed on the accuracy or adequacy of the contents of this presentation. Any representation to the contrary is unlawful.

Safe Harbour statement: this presentation may contain forward-looking statements that reflect the Company’s current views and expectations regarding future events. In particular certain statements with regard to management’s strategic vision, aims and objectives, the conduct of clinical trials, the filing dates for product licence applications and the anticipated launch of specified products in various markets, the Company’s ability to find partners for the development and commercialisation of its products as well as the terms for such partnerships, anticipated levels of demand for the Company’s products (including in development), the effect of competition, anticipated efficiencies, trends in results of operations, margins, the market and exchange rates, are all forward looking in nature.

Forward-looking statements involve risks and uncertainties that could cause actual results to differ materially from those expressed or implied by the forward looking statements. Although not exhaustive, the following factors could cause actual results to differ materially from those the Company expects: difficulties inherent in the discovery and development of new products and the design and implementation of pre-clinical and clinical studies, trials and investigations, delays in and results from such studies, trials and investigations that are inconsistent with previous results and the Company’s expectations, the failure to obtain and maintain required regulatory approvals, product and pricing initiatives by the Company’s competitors, inability of the Company to market existing products effectively and the failure of the Company to agree beneficial terms with potential partners for any of its products or the failure of the Company’s existing partners to perform their obligations, the ability of the Company to obtain additional financing for its operations and the market conditions affecting the availability and terms of such financing, the successful integration of completed mergers and acquisitions and achievement of expected synergies from such transactions, and the ability of the Company to identify and consummate suitable strategic and business combination transactions and the risks described in our most recent Admission Document.

By participating in this presentation and/or accepting any copies hereof you agree to be bound by the foregoing restrictions and the other terms of this disclaimer.

© Silence Therapeutics 2018 2

Page 3: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Silence Therapeutics - Overview

© Silence Therapeutics 2018 3

> Developing RNA interference (RNAi) therapeutics, a highly innovative, specific, new class of medicines with life-saving potential for patients with serious and rare diseases

> Only quoted European RNAi drug development Company

> Proprietary platform technology builds on years of scientific research and in-house know-how

> Liver focussed – >7,000 genes are expressed in hepatocytes, many of which are therapeutic targets

> Validating licensing agreement with Quark Pharmaceuticals

> Lead pre-clinical development programme for iron overload disorders (IOD)

> Led by an international, sector-experienced Board and Executive Team

> 30 people in Berlin (R&D) and 15 people in London (Corporate and R&D)

> Explore options to expand our international capital market presence, including the potential for a NASDAQ listing

> Traded on the LSE:AIM – £138 million/$190 million mkt cap* with strong cash runway (£43 million as of 2 January 2018)

* 5 March 2018 price & conversion

Page 4: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Preliminary Results - Highlights

© Silence Therapeutics 2018 4

Operational Highlights

> Generated extensive, multi-faceted, pre-clinical data demonstrating clear proof of biologic mechanism and concept for lead programmes• Data includes key findings in animal disease models representative of IOD, increasing confidence in Silence’s lead

candidate

> Licensee Quark announced positive results of a Phase 2 trial • Met primary endpoints in trial for the prevention of Acute Kidney Injury in patients at high risk following cardiac surgery• Exclusively partnered with Novartis which has an option for worldwide development and commercialisation in AKI

> Two lead programmes for iron overload disorders (IOD) and alcohol use disorder (AUD) on track to move into clinical development within 18 months• SLN124 planned to enter clinical development by the end of 2018

> Recruited five high calibre individuals to team• Leadership roles at both major global pharma and entrepreneurial biotechnology companies, as well as deep RNAi and

oligonucleotide expertise

> Commenced UK litigation action against Alnylam Pharmaceuticals and The Medicines Company• Both companies subsequently sought claims for revocation and declarations of non-infringement in respect of the patent in

suit. Silence counterclaimed for threatened infringement of the patent in suit in November 2017 • Likely that all issues between the parties will be heard at a trial beginning on, or around, 3 December 2018

Page 5: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Preliminary Results - Highlights (continued)

© Silence Therapeutics 2018 5

Financial Highlights

> Loss after tax of £1.6 million (2016: £8.4 million)

> Cash and cash equivalents of £42.7 million (2016: £39.0 million)

> Net cash outflow from operating activities £9.6 million (2016: £10.1 million)

> Realised gain on disposals of Arrowhead shares £9.1 million (2016: £nil)

> Significantly bolstered balance sheet cash with sale of Arrowhead shares with proceeds totalling $24.3 million

Post Year-End Events

> New European patent (EP 1857547B) granted further protecting Silence’s key siRNA chemical modifications

that read widely across the RNAi industry

> Disposal of the final portion of Arrowhead shares with cumulative proceeds totalling $24.7 million and a cash

balance of £43 million as of 2 January 2018

Page 6: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Pipeline - Building a Proprietary Portfolio

6© Silence Therapeutics 2018

SLN124

SLN226

Internal programmes advanced into preclinical development

Our Programmes

Out-Licensed Programmes

SLN124

SLN226

4Q2018

Mid 2019

Mid 2019

Page 7: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

RNAi/CRISPR Companies: Development Stage & Market Cap

© Silence Therapeutics 2018 7

Mar

ket C

ap ($

ml)

1,000

100

10,000

SLN

ARWR

ALNYLAM

-Patisiran-Fitusiran-Inclisiran-Givosiran

DRNA

CrisprEditas

Quark*/SLN

Intellia

Company Market Cap $MSilence 192

Arrowhead 562

Dicerna 658

Intellia 941

Editas 1,628

CRISPR 1,765

Alnylam 12,000

Pre-clinical Phase I Phase 2 Phase 3 Commercial

* Private

Page 8: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Experienced Leadership Team: Strong Background in Discovery & Development of RNA Therapies

© Silence Therapeutics 2018 8

Dmitry Samarsky, Ph.D. Chief Scientific Officer

Ali Mortazavi, Chief Executive Officer

David Ellam, Chief Financial Officer

Torsten Hoffmann, Ph.D.Chief Operating Officer

Laura Roca-Alonso, Ph.D. Head of Corporate

Development

Michael Mulqueen, Head of BD & Licensing

Alison Gallafent, Head of Intellectual

Property

Ulrich Zugel, Ph.D.Head of Pre-Clinical Drug

Discovery

Linnea Elrington,Head of Human Resources

Since 2012

Since 2016

Since 2017

Since 2017

Since 2014

Since 2016

Since 2016

Since 2017

Since 2017

Page 9: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Technology Innovation

> Improve performance of our GalNAc-siRNA molecules

> Strengthen and broaden IP portfolio

> Expand RNAi horizons beyond hepatocytes

> Apply to therapeutic portfolio upon validation

R&D with Focus on Portfolio and Innovation

© Silence Therapeutics 2018 9

Drug Discovery & Development

> Build proprietary therapeutic portfolio by applying validated siRNA technologies

> Partner programmes in a strategic manner

> Add new programmes in a risk-diversified manner

Page 10: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

GalNAc-siRNA Platform Technology

© Silence Therapeutics 2018 10

Page 11: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

How Do siRNA Medicines Work?

© Silence Therapeutics 2018

RNA interference is > A Nobel prize-winning

discovery> A natural pathway that

can be harnessed to inhibit the expression of disease-causing genes without altering DNA

11

We can specifically target any gene in the genome with our short interfering RNA (siRNA) molecules

mRNA sequence for target gene X

siRNA designed specifically against target gene X

1

2

Antisense strand binds to mRNA complementarily

3

mRNA degradation and gene silencing

4

mRNA

siRNA

mRNA

mRNA Antisense strand

Page 12: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

GalNAc-siRNA Medicines

Schematic structure of our therapeutic molecules:

© Silence Therapeutics 2018 12

siRNAMediates gene silencing

GalNAc (N-Acetylgalactosamine)Mediates targeted delivery to hepatocytes

Chemical modifications

LinkerBinds siRNA to delivery moiety

A C G U U C G A C C G A A G U C AU G C A A G C U G G C U U C A G U

How do we ensure that our medicines are protected and free to use?

> GalNAc as a targeting ligand per se is free to use> We have a robust position for our foundational chemical modification technology> We patent our linker chemistries> We patent our potent and highly specific siRNA constructs and lead sequences

Page 13: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Platform technology: GalNAc-siRNA, able to mediate highly specific gene silencing in hepatocytes (liver) – “Specificity upon specificity”

~7,000 genes operate in the liver. We can target any of them by adapting the siRNA sequence, using the same technology

Platform Performance

© Silence Therapeutics 2018 13

We are able to reproducibly silence disease-causing genes using our platform technology

Target 1 Target 2 Target 3 Target 4

Single SC dose of 2-3 mg/kg in healthy mice; analysis after 1-2 weeks

P B S s iR N A 20 .0

0 .5

1 .0

No

rmal

ised

tar

get

mR

NA

C T R L s iR N A 10 .0

0 .5

1 .0

No

rmal

ised

tar

get

mR

NA

C T R L s iR N A 30 .0

0 .5

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rmal

ised

tar

get

mR

NA

C T R L s iR N A 40 .0

0 .5

1 .0

No

rmal

ised

tar

get

mR

NA

Page 14: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Advantageous Properties of Medicines

© Silence Therapeutics 2018 14

> Subcutaneous administration, patient friendly> Long duration of action (variable depending on target gene)> Well tolerated> Our GalNAc-siRNA medicines are suitable for a wide range of indications

NADIR

Target KD induction

Trend towardrecovery to baseline levels

Page 15: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

$ $ $ $ $Cost:

...

Platform Strategy

© Silence Therapeutics 2018 15

CTA/IND enabling

Disease model (pPOC)

Healthy animals (POM)

~7,000 accessible gene targets…We have the technology and the team to discover and develop a wide range of therapeutics

* proof of mechanism in healthy mice** proof of concept in animal disease model*** clinical trial application

We intend to strategically partner our programmes at different stages to fully unlock the value of our platform – Rapid path to value creation

Technology deals

Phase 1/Phase 2

Phase INCD, CMC, Regulatory

Diseasemodels

KD in vivo

In vitroscreen

In silicoselection

Target & IndicationSelection

POM* pPOC** CTA***

Page 16: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Intellectual Property - Pioneers in siRNA Chemical Modification Technology Since 2003

© Silence Therapeutics 2018 16

> Chemical modifications of siRNA are required to: 1) prevent degradation, 2) increase stability and potency, 3) reduce immune stimulation

> IP validation: License agreement with Quark Pharmaceuticals, which currently has two late-stage candidates in clinical development using our chemical modification technology

We have 13 granted patents and 5 patent applications encompassing our foundational chemical modification technology in US and Europe

> We believe third parties are infringing under our portfolio and we have:• Disclosed some of the relevant competitor products

• Served a claim with the UK High Court (defendants: Alnylam Pharmaceuticals and The Medicines Company) to determine whether Silence’s European patent protection is entitled to a 5-year extension for the products named in the claim

Modified siRNA (example)

> We remain focused on executing our core business of drug discovery, R&D

Page 17: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

SLN124 for the treatment of

Iron Overload Disorders

© Silence Therapeutics 2018 17

A case study of our platform

Page 18: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Treatment of Ion Overload Disorders (IOD)

© Silence Therapeutics 2018 18

GOAL> Provide an effective and safe novel treatment option for patients with iron

overload conditions, such as β-Thalassemia

RATIONALE> Target a key modulator in iron regulation with a GalNAc-siRNA molecule

providing a highly specific, effective & safe option through inhibition of a disease relevant target gene expressed in hepatocytes

CURRENT STAGE> Preclinical development with plans to enter clinical development in

Q4/2018

Page 19: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

ErythropoiesisMacrophages

Duodenal Enterocytes

Hepcidin

IRON

Red bloodcells

LiverTMPRSS6

Normal hepcidin levels control iron releasefrom cellular stores & intestinal uptake

TMPRSS6 is a Negative Regulator of Hepcidin and Plays a Key Role in Iron Homeostasis

© Silence Therapeutics 2018 19

TMPRSS6 = Transmembrane Protease, Serine 6

Reduces iron levels

Improves erythropoiesis

1 Increases hepcidin levels

Reduces organ iron overload

2 43Silencing TMPRSS6

SLN124

ErythropoiesisMacrophages

Red bloodcells

Duodenal EnterocytesLiver

IRON

Hepcidin

TMPRSS6

ErythropoiesisMacrophages

Red bloodcells

Duodenal EnterocytesLiver

IRON

Hepcidin

Low hepcidin levels, as in β-Thalassemiaresult in high iron levels & overload in organs

TMPRSS6

ErythropoiesisMacrophages

Red bloodcells

Duodenal EnterocytesLiver

IRON

Hepcidin

TMPRSS6

ErythropoiesisMacrophages

Red bloodcells

Duodenal EnterocytesLiver

IRON

Hepcidin

Low hepcidin levels, as in β-Thalassemia result in high iron levels & overload in organs

TMPRSS6

Page 20: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

siRNA Screen and GalNAc Conjugate Testing in Primary Hepatocytes

© Silence Therapeutics 2018 20

0 .1 1 1 0 1 0 0 1 0 0 00 .0

0 .5

1 .0

G a lN A c T M P R S S 6 s iR N A [n M ]

No

rma

lis

ed

TM

PR

SS

6 m

RN

A

0 .0 1 0 .1 1 1 0 1 0 0 1 0 0 00 .0

0 .5

1 .0

G a lN A c T M P R S S 6 s iR N A [n M ]

No

rma

lis

ed

TM

PR

SS

6 m

RN

A

0 .0 1 0 .1 1 1 0 1 0 0 1 0 0 00 .0

0 .5

1 .0

G a lN A c T M P R S S 6 s iR N A [n M ]

No

rma

lis

ed

TM

PR

SS

6 m

RN

A

TMPRSS6 mRNA(receptor-mediated uptake)1° Hep (mouse)

1° Hep (cyno)1° Hep (human)

TMPRSS6 mRNA(in vitro screen – Selected siRNAs)

> Lead siRNA for TMPRSS6 identified (picomolar IC50 by transfection)> GalNAc-siRNA conjugate is functional in primary hepatocytes from different species (mouse,

human, cynomolgus)

h Hep3B cells

0.0

0.5

1.0

1.5

4 14 10 3 11 6 8 13 12 15 1 5 2 7 9UTLuc TMPRSS6 siRNA

Nor

mal

ised

TMPR

SS6

mR

NA

Lead

Page 21: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

1 0C T R L

1 3T M P R S S 6

1 00

1 0

2 0

3 0

4 0

Ser

um

iro

n [

µm

ol/L

]

m g /k gs iR N A

1 0C T R L

1 3T M P R S S 6

1 00

1

2

3

4

No

rmal

ised

Hep

cid

in m

RN

A

m g /k gs iR N A

1 0C T R L

1 3T M P R S S 6

1 00 .0

0 .5

1 .0

No

rma

lis

ed

TM

PR

SS

6 m

RN

A

m g /k gs iR N A

Silencing TMPRSS6 Lowers Serum Iron Levels in Mice

© Silence Therapeutics 2018 21

TMPRSS6 mRNA (liver) Hepcidin mRNA (liver) Iron (serum)

>Single subcutaneous administration results in specific KD of TMPRSS6>Upregulated Hepcidin causes reduction of blood iron levels>Proof of mechanism demonstrated

Study designd1 d4

SC, n=4-6 mice

Page 22: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

1P B S

1 3T M P R S S 6 s iR N A

60

1 0

2 0

3 0

4 0

Ser

um

iro

n [

µmo

l/L]

w e e k s1P B S

1 3T M P R S S 6 s iR N A

60 .0

0 .5

1 .0

No

rmal

ised

TM

PR

SS

6 m

RN

A

w e e k s

SLN124 Lowers Iron Levels for at Least 6 Weeks After Single Administration in Mice

© Silence Therapeutics 2018 22

TMPRSS6 mRNA (liver) Iron (serum)

Study design

>Long-lasting functional mRNA KD in liver >Reduction of serum iron levels for at least 6 weeks>Well tolerated with long duration of action in mice

wk 6d1 wk 1 wk 3

SC, n=4 mice, 3 mg/kg

Page 23: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

P B S3

C T R L1

T M P R S S 6 3

0 .0

0 .5

1 .0

1 .5

2 .0

No

rma

lis

ed

TM

PR

SS

6 m

RN

A

m g /k gs iR N A

P B S3

C T R L1

T M P R S S 6 3

0

1 0 0

1 8 0

2 0 0

2 2 0

2 4 0

[µg

Iro

n/g

dry

tis

su

e]

m g /k gs iR N A

P B S3

C T R L1

T M P R S S 6 3

0

1 0 0

2 0 0

3 0 0

Se

rum

Iro

n [

µg

/dL

]

m g /k gs iR N AP B S

3C T R L

1 T M P R S S 6

30

2 0 0

4 0 0

6 0 0

8 0 0

Se

rum

He

pc

idin

[n

g/m

L]

m g /k gs iR N A

Therapeutic Activity of SLN124 in Iron Overload Model (HFE -/- mice)

© Silence Therapeutics 2018 23

> Dose-dependent and robust silencing of TMPRSS6 mRNA in the liver

> Increase in serum hepcidin levels> Reversion of serum and kidney iron levels to

physiological values

TMPRSS6 mRNA (liver) Hepcidin (serum) Iron (serum)

Iron (kidney)

Study designd1 wk 3

SC, n=6-7 mice

Collaboration withProf. Dr. Martina MuckenthalerUniversity of Heidelberg, Germany

Page 24: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Collaboration withProf. J. Vadolas & Dr. Grigoriadis Monash Medical Centre/Melbourne, Australia

SLN124 Normalises ROS Species & Improves RBC Parameters in β-Thalassemia Disease Model

© Silence Therapeutics 2018 24

-W T m ic e

P B S C T R LT h 3 /+ m ic e

T M P R S S 60

1 0 0

2 0 0

3 0 0

4 0 0

5 0 0

8 0 0

Med

ian

FI

s iR N A -W T m ic e

P B S C T R LT h 3 /+ m ic e

T M P R S S 60

5

1 0

1 5

2 0

2 5

Ret

icu

locy

tes

[%]

s iR N A -W T m ic e

P B S C T R LT h 3 /+ m ic e

T M P R S S 60

3 0

4 0

5 0

6 0

Hae

mat

ocr

it [

%]

s iR N A

> Normalisation of ROS to levels in healthy mice> Normalisation of reticulocyte proportion and improvement of haematocrit> SLN124 significantly improves erythropoiesis in animal model for

β-Thalassemia intermedia

Study designd1 wk 5

SC, n=6-8 Hbbth3/+ mice

wk 2

ROS = reactive oxygen species; RBC = red blood cells

Reactive oxygen species (ROS) Reticulocyte proportion Haematocrit

Page 25: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Feedback by Key Opinion Leaders on SLN124

© Silence Therapeutics 2018 25

> High medical need to reduce iron overload and number of transfusions in patients

> Not met by currently available therapies> SLN124 has the potential to

> Reduce systemic iron> Prevent organ iron overload> Enhance erythropoiesis

... providing a significantly improved therapeutic option and better quality of life for patients living with iron overload conditions, such as β-Thalassemia

International KOL workshop with clinical and regulatory experts in the field of iron overload disorders

Page 26: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

>3,000,000Haemochromatosis

>150,000MDS

Market Opportunity of SLN124 (US & Europe)

© Silence Therapeutics 2018 26

Haemochromatosis

β-Thalassemia intermedia & T. major (TDT)> Combination with transfusions

& chelators to reduce frequency & dose

> Improve erythropoiesis and reduce secondary iron overload burden

β-Thalassemia intermedia (NTDT)> Monotherapy to delay onset of

severe symptoms > Reduce dietary iron overload &

subsequent organ damage

20,000NTDT

40,000TDT

Other iron overload disorders

TDT = transfusion dependent Thalassemia; NTDT = non-transfusion dependent Thalassemia

Myelodysplastic Syndrome (MDS)

SLN124 for β-Thalassemia with significant upside potential for otheriron overload disorders

*US & Europe

Page 27: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

Why we are Excited about SLN124?

© Silence Therapeutics 2018 27

2018: Gene silencing via siRNA is a proven concept

Mechanistic claim –treatment of iron overload disorders

QoL parameters will be improved such as transfusion frequency and drug burden of chelators

First In Class in iron overload

SLN124 has proven to increase hepcidin and reduce iron plasma levels, thus restoring iron homeostasis

Central role of hepcidin enables lowering of iron plasma levels, optimisingerythropoiesis

Launch would be expected by 2024/25 via an Orphan designation

The GalNAc conjugate targets hepatocytes in the liver, acting specifically at hepcidin’s predominant synthesis site

Pediatrics and adults will be treated

We are seeking commercialisationpartnerships

Science Indication Patient Market

What does the Mode of action bring?

How does the science connect to the diseases?

What is the patient benefit?

When and where do we want to market it?

SLN124 is highly specific targeting a single gene

SLN124: a treatment in the mono- or combination therapy setting as new SoC

We will work with patient organisations in 2018

A corporate strategy is required to access geographies in the middle and far east

SLN124 has the potential to become an essential component of the future SoC

beta-ThalassemiaMyelodysplastic SyndromesPotential for Haemochromatosis

Enables an early treatment option for the prevention of iron deposition in organs

High value product with peak sales of $600 million (BT) and $3 billion (MDS)

Page 28: Full Year Results 2017 Presentation - Silence …...inhibit the expression of disease-causing genes without altering DNA 11 We can specifically target any gene in the genome with our

SLN124 - Summary

© Silence Therapeutics 2018 28

> Highly potent, selective and long-acting GalNAc-siRNA molecule

> Efficacious in lowering blood iron and well tolerated in healthy mice and non-human primates

> Demonstrated therapeutic efficacy in clinically relevant disease models

> Currently in preclinical development with plans to enter clinical development in Q4 2018

SLN124 represents a highly valuable therapeutic candidate for patients with iron overload disorders, such as β-Thalassemia

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Outlook: Significant Milestones for the Next 12 months

© Silence Therapeutics 2018 29

> File clinical trial approval for iron overload by end of 2018

> Add further development expertise to the senior team as pipeline progresses

> Secure further validating collaborations utilising our GalNAc platform technology

> Add new targets to pipeline, and utilise next generation technology

> Continue defensive UK litigation action

2018 will be a year of continuity and building upon success to capturevalue by executing on pipeline development and leveraging its platform

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Appendix

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© Silence Therapeutics 2018 31

SLN226 for the treatment of

Alcohol Use Disorder

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SLN226 for the Treatment of Alcohol Use Disorder

© Silence Therapeutics 2018 32

GOAL> Provide an effective & safe novel treatment option for patients with alcohol

use disorder (AUD)

RATIONALE> Target ALDH2, a validated target for alcohol aversion therapy, with a

GalNAc-siRNA molecule providing a highly specific, effective & safe option through inhibition of the ALDH2 gene expressed in hepatocytes

CURRENT STAGE> Preclinical development with plans to enter clinical development in

Q2/2019*

*potentially with partner

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SLN226 Mechanism of Action

© Silence Therapeutics 2018 33

> Aldehyde dehydrogenase 2 (ALDH2) is the key alcohol metabolizing enzyme > Liver is the key organ for ethanol detoxification by ALDH2 > ALDH2 is rate limiting enzyme in the ethanol metabolic pathway

ADH

Acetate

Acetaldehyde

Ethanol

ALDH2 siRNA

Liver

Unpleasant physiological effects

Disrupt addictive cycle & alcohol seeking behavior

1 Acetaldehyde accumulation upon alcohol consumption

Abstinence2 43SilencingALDH2

Validated target

> Clinically: ALDH inhibitors e.g. Disulfiram

> Genetically in human subpopulations: alcohol flushing reactionALDH2

siRNA

Ethanol

ALDH2

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0 .1 1 1 0 1 0 00 .0

0 .5

1 .0

s iR N A [n M ]

No

rmal

ised

AL

DH

2 m

RN

A

Robust ALDH2 mRNA Knockdown in Primary Hepatocytes

© Silence Therapeutics 2018 34

> Bioinformatic-based selection of siRNA sequences by proprietary algorithmand screen for functional activity

> Several sequences identified which potently inhibit ALDH2 mRNA expressionin target cells

Human primary hepatocytes

>Receptor mediated uptake & is highly potent in the nM range

>Efficacy in primary hepatocytes (mouse, cynomolgus, human)

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1 0C T R L

3 A L D H 2

1 00

5 0

1 0 0

1 5 0

Ace

tald

ehyd

e le

vels

in li

ver

[ng

/mg

]

m g /k gs iR N A

1 0C T R L

3 A L D H 2

1 00 .0

0 .5

1 .0

1 .5

Ald

ehyd

deh

ydro

gen

ase

acti

vity

s iR N Am g /k g1 0

C T R L3

A L D H 2 1 0

0 .0

0 .5

1 .0

1 .5

No

rmal

ised

AL

DH

2 m

RN

A

s iR N Am g /k g

ALDH2 GalNAc-siRNA Treatment Induces Hepatic Acetaldehyde Accumulation in Mice

© Silence Therapeutics 2018 35

Study designd1 d10-4 h EtOH

> Single administration results in specific ALDH2 mRNA silencing> Silencing ALDH2 reduces the capacity of mouse liver to metabolise acetaldehyde> Proof of mechanism demonstrated

ALDH2 mRNA (liver) ALDH enzymatic activity (liver) Acetaldehyde (liver)

SC, n=6 mice

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SLN226 Reduces ALDH2 mRNA in Liver6 Weeks after Single Administration in Mice

© Silence Therapeutics 2018 36

> Robust mRNA reduction up to 6 weeks by single administration of 10 mg/kg> Well tolerated with long duration of action in mice

ALDH2 mRNA (liver)

3 3 3 30 .0

0 .5

1 .0

No

rmal

ised

AL

DH

2 m

RN

A

C T R L A L D H 23 3 1 0

1 0 d a y s

C T R L A L D H 23 3 1 0

2 0 d a y s

C T R L A L D H 23 3 1 0

3 0 d a y s

C T R L A L D H 23 3 1 0

4 0 d a y s

s iR N A

m g /k g

Study designd30d1 d10 d20

SC, n=5 mice, -4 h EtOH

d40

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Feedback by Key Opinion Leaders on SLN226

© Silence Therapeutics 2018 37

> Alcohol abuse & physiological dependence on alcohol is a global problem with tremendous impact on health, society and economics

> There is a clear unmet medical need to become abstinent> Not sufficiently met by currently available therapies

> Hepatologists may be more attracted to prescribing SLN226 as an extension to psychotherapy

> SLN226 has the potential to aid abstinence in alcohol dependentpatients on psychotherapy

... providing a significantly improved and safe therapeutic optionto improve compliance and alcohol abstinence for patients living withalcohol use disorder

International KOL workshop with clinical experts in the field of alcohol use disorder

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Potential of SLN226 Compared to Disulfiram

© Silence Therapeutics 2018 38

Reduced side effect potential(1) Hepatocyte-specific GalNAc formulation (reduction of cardio- & neurotoxic

adverse effects)(2) ALDH2-specific targeting (Disulfiram inhibits ~20 off-target enzymes) Improved safety profile

Higher therapy success rate(1) KD for weeks advantageous (Disulfiram requires daily in-take causing high

percentage of patients to drop out/cheat)(2) Effective support of alcohol dishabituation and high potential to reduce

therapy failure Better patient compliance

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16,000,000Alcohol-induced cirrhosis

and/or hepatitisAlcohol-induced hepatitis

8,000,000Alcohol-induced

cirrhosis

Alcoholic Liver Diseaserelated disordersAlcohol-induced cirrhosis

Market Opportunity of SLN226 (US & Europe)

© Silence Therapeutics 2018 39

Patients urgently requiring abstinence >20-33% liver transplants due to

alcohol abuse alone or in combination with viral infection

>Potentially a similar number of patients on the waiting list needing abstinence support

>Expansion to patients with alcohol use disorder strongly committed to abstinence

40,000Requiring

abstinence

>SLN226 has significant potential to aid abstinence in alcohol dependent patients on psychotherapy

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SLN226 - Summary

© Silence Therapeutics 2018 40

> Highly potent, selective and long acting GalNAc-siRNA molecule

> Induces acetaldehyde accumulation in mice after single subcutaneous administration

> Currently in preclinical development with plans to enter clinical development in Q2 2019*

> Studies initiated to show therapeutic efficacy in a clinically relevant disease model and in higher species

SLN226 represents a highly valuable therapeutic candidate for patients with AUD to maintain alcohol abstinence

*potentially with partner