Vaccines Vaccines elicit immune responses These responses: prevent infectious diseases (ie. prophylaxis)
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1 Vaccines What is a Vaccine? How do Vaccines work? The economics of Vaccines? Do Vaccines prevent disease? Where are new Vaccines needed? What is hot in vaccine development?
2 Vaccines Vaccines elicit immune responses These responses: prevent infectious diseases (ie. prophylaxis) cure existing infectious diseases (ie. therapeutic) block physiology (eg. anti-hormone, fertility...) prevent and cure cancers (eg. antiviral, anticancer) block autoimmune, allergic reactions (eg. desensitize)
3 Vaccines Vaccines elicit immune responses These responses: prevent infectious diseases (ie. prophylaxis) cure existing infectious diseases (ie. therapeutic) block physiology (eg. anti-hormone, fertility...) prevent and cure cancers (eg. antiviral, anticancer) block autoimmune, allergic reactions (eg. desensitize)
4 Vaccines Vaccines elicit immune responses Systemic antibody - neutralize infectivity Secretory antibody - block initial adhesion Killer T cells (CTL, CD8+) - kill infected cells Helper T cells (Th, CD4+) - help B cells and CTL Type of immune response depends on the formulation Live attenuated vaccines (eg. Sabin polio) = broad Adjuvanted subunit vaccine = narrow, improving
5 Vaccines What is a Vaccine? How do Vaccines work? The economics of Vaccines? Do Vaccines prevent disease? Where are new Vaccines needed? What is hot in Vaccine development?
6 How do Vaccines work? Immunological Memory Low precursor frequency Expansion of Virus-specific clones High precursor frequency An immune response changes the pool of lymphocytes - increases frequency of some cells
7 How do Vaccines work? Immunological memory (cont.) The change in frequency of specific cells = change the kinetics of the immune response Organism seen for first time (= primary response) magnitude of immune response response rate lag - time to response pathogen primary time
8 How do Vaccines work? Immunological memory (cont.) Organism seen for second time (secondary response) More rapid, higher immune response magnitude of immune response more rapid, higher response shortened lag pathogen primary pathogen secondary time
9 How do Vaccines work? Immunological memory (cont.) Organism seen for second time (secondary response) More rapid, higher immune response magnitude of immune response pathogen primary pathogen secondary time
10 How do Vaccines work? Immunological memory (cont.) Organised lymphoid tissues esp. lymph nodes Leads to increase in precursor frequency eg. pctl magnitude of immune response pathogen primary pathogen secondary time
11 How do Vaccines work? To increase the pctl, specific B cell numbers.. 4 strategies: a virus similar to the pathogen is used a less virulent variant of the virus is used only a part (subunit) of the pathogen is used the virus is cultured, killed, then injected
12 How do Vaccines work? To increase the pctl, specific B cell numbers.. 4 strategies: a virus similar to the pathogen is used eg. cowpox, vaccinia for smallpox, Sabin polio a less virulent variant of the virus is used eg. measles, mumps, rubella a part (subunit) of the virus is used eg. influenza split virus the virus is cultured, killed, then injected eg. Salk polio
13 Vaccines What is a Vaccine? How do Vaccines work? The economics of Vaccines? Do Vaccines prevent disease? Where are new Vaccines needed? What is hot in Vaccine development?
14 The economics of vaccines The 3 most effective health interventions are: 1. Provision of clean water (ie. preventing infectious diseases) 2. Anti-smoking campaigns (ie. preventing self harm) 3. Vaccination (ie. preventing infectious diseases)
15 BUT
16 Vaccines represent a VERY small percentage of global pharmaceutical sales $350 $340 $300 $250 $ Billions $200 $150 $100 $50 $0 $5 $0.5 Global Pharma Market Global Vaccine Market Developing Country Vaccine Market Amy Batson, Orphan Vaccines 2001
17 GlaxoSmithKline - breakdown of sales GSK Pharmaceuticals Pro-forma sales: $27 billion (1999) Consumer health 16% Vaccines 5 % Alimentary & metabolic 10% Central nervous system 18 % Others 11 % Respiratory 15 % Anti-infectives 25 % Amy Batson, Orphan Vaccines 2001
18 5 vaccine manufacturers control the vaccine market Share of the vaccine market 100% 80% 60% 40% 20% 0% $5.2 billion Other (10%) Chiron (7%) Merck (17%) Wyeth (19%) GSK (23%) Aventis (23%) Serum Institute of India (1%) Bio Farma (<0.5%) Amy Batson, Orphan Vaccines 2001
19 The vaccine market is comprised of a number of distinct product and customer groups 100% 80% Vaccine market Uni/PAHO (5%) Adult Vaccine Market (15%) 60% 40% Pediatric Country Market (30%) Prevenar (10%) 20% Proprietary Market (40%) 0% Revenue Amy Batson, Orphan Vaccines 2001 Doses
20 The vaccine market is comprised of a number of distinct product and customer groups 100% 80% Vaccine market Uni/PAHO (5%) Adult Vaccine Market (15%) UNICEF and PAHO account for 5% of the revenues and roughly 50% of the volume 60% 40% Pediatric Country Market (30%) Prevenar (10%) 20% Proprietary Market (40%) 0% Revenue Amy Batson, Orphan Vaccines 2001 Doses
21 The vaccine market is comprised of a number of distinct product and customer groups 100% 80% Vaccine market Uni/PAHO (5%) Adult Vaccine Market (15%) UNICEF and PAHO account for 5% of the revenues and roughly 50% of the volume $900 Prevnar Sales $800 $800 60% Pediatric Country Market $700 40% (30%) Prevenar (10%) $US Millions $600 $500 $400 $461 20% Proprietary Market (40%) $300 $200 $100 $0 0% Revenue Doses $ Amy Batson, Orphan Vaccines 2001
22 Prices for newer vaccines are more than for traditional vaccines $US per dose $50 $40 $30 $20 $10 Price of traditional and new vaccines Traditional Vaccines $0 Rubella (1970) MMR (1975) DTP (1985) DTaP (1992) DTP/Hib (1993) Varicella (1996) Pneumo conjugate (2000) Amy Batson, Orphan Vaccines 2001 Source: CDC contract prices, New Vaccines of the 1990s
23 Baseline: Costs and decision gates in vaccine development Cumulative investment (US$Millions) Decision gates develop candidate Efficacy trials Scaling up manufacturing capacity Commercialization in target population High cost, low probability A disincentive to invest in early stage work 0 basic research Elapsed years Amy Batson, Orphan Vaccines 2001 Source: Mercer Management Consultants
24 Baseline: Costs and decision gates in vaccine development Cumulative investment (US$Millions) Decision gates develop candidate Efficacy trials Scaling up manufacturing capacity Commercialization in target population High cost, low probability A disincentive to invest in early stage work 0 basic research Elapsed years Amy Batson, Orphan Vaccines 2001 Source: Mercer Management Consultants
25 Baseline: Costs and decision gates in vaccine development Management nightmare Cumulative investment (US$Millions) Decision gates develop candidate Efficacy trials Scaling up manufacturing capacity Commercialization in target population High cost, low probability A disincentive to invest in early stage work 0 basic research Elapsed years Amy Batson, Orphan Vaccines 2001 Source: Mercer Management Consultants
26 Commercial Strategy: Differential Pricing - paying for developing country vaccines 100% 80% Vaccine market Uni/PAHO (5%) Adult Vaccine Market (15%) Differential pricing eg USA 250x lowest price 60% 40% Pediatric Country Market (30%) Prevenar (10%) US $/dose Index eg Burundi 70x lowest price 20% Proprietary Market (40%) 20 0% Revenue Doses 0 Markets Amy Batson, Orphan Vaccines 2001
27 Schematic model of the cash flow of a new medicine R&D cost Net revenue from a viable market* $ Expenditure Revenue Time Launch Patent expiry *NB expenditure on clinical studies, manufacturing, marketing etc continues after launch but for simplicity has been netted out.
28 The bottom line Vaccines are expensive to develop (though cheaper than some drugs) Margins on vaccines are poor As vaccines improve, they are used less often cf. chronic disease drugs eg. Enbrel ROI drives R&D expenditure Reluctance by Pharma to invest on the most needed (ie. unmet medical need) vaccines Growing involvement of Big Philanthropy
29 Vaccines What is a Vaccine? How do Vaccines work? The economics of Vaccines? Do Vaccines prevent disease? Where are new Vaccines needed? What is hot in Vaccine development?
30 Polio Boston has so many polio cases that parents drive their sick children to Children's Hospital and sit in their cars on the street while resident physicians decided who would go inside. Polio had earlier crippled an American president, Franklin Delano Roosevelt, and had fearful parents keeping children out of public places. The symptoms started with fever and, in severe cases, progressed to the point where only an iron lung could keep its victims alive.
31 Do Vaccines prevent disease? Example Polio Weller Enders Robbins grew poliovirus in 1950
32 Do Vaccines prevent disease? Example Polio
33 Do Vaccines prevent disease? Example Polio Rancho Los Amigos US, 1950s
34 Do Vaccines prevent disease? Example Polio Killed vaccine Live vaccine Salk Sabin
35 Do Vaccines prevent disease? Example Polio Last case of polio In the Pacific
36 Do Vaccines prevent disease? Example Polio
37 Do Vaccines prevent disease? Example Polio
38 Do Vaccines prevent disease? Example Pertussis (whooping cough)
39 Vaccines - impact on incidence Vaccine-preventable disease incidence reductions Data c.1900 c.2000 % decrease Smallpox 48, Diphtheria 175, Pertussis 147,000 6, Tetanus 1, Polio 16, Measles 503, Mumps 152, Rubella 47, Hib 20,000^
40 Do Vaccines prevent disease? Cf. infection in the recipient and herd immunity
41 Vaccines What is a Vaccine? How do Vaccines work? The economics of Vaccines? Do Vaccines prevent disease? Where are new Vaccines needed? What is hot in Vaccine development?
42 Infectious Disease Mortality 1995 (World Health Rep 1996) Deaths (1,000s) ALRI 4416* Diarrhea 3115* Tuberculosis complex 3072* Malaria 2100 HBV 1156 Measles 1066* HIV/AIDS 1063 Tetanus 459 Pertussis 355 Leishmaniasis 80 Hookworm 65 Ascariasis 60 Onchocerciasis 47 Chagas disease, dengue etc c.120 Total (= 17million) All causes (= 51 million) Vaccine preventable (*some) (= 10million)
43 Where are new Vaccines needed? Malaria HIV/AIDS Gastrointestinal diseases (eg. rotavirus) Respiratory diseases (eg. RSV (croup)) Better TB Parasitic infections.. Who will fund these vaccines? Each cost >$500M to develop, then much more to implement
44 What does it take to make a vaccine? 1. Understanding of the disease 2. Understanding of the pathogen 3. Pre-genetic era - growth of the pathogen or part of the pathogen, attenuation (reduction in potency of the pathogen) 4. Post-genetic era - recombinant subunit 5. Testing of the vaccine = safe + effective (= $$) 6. Use of the vaccine (=$) 7. Use of the vaccine (=$) 8. Use of the vaccine (=$)
45 Vaccines What is a Vaccine? How do Vaccines work? The economics of Vaccines? Do Vaccines prevent disease? Where are new Vaccines needed? What is hot in Vaccine development?
46 What is hot in Vaccine development? Harmonisation of regulatory environments Move towards greater characterisation, purity Safety paramount eg. rotavirus = longer lead times to deployment Polio = 6 years HAV, HZV, rotavirus > 25 years HIV, first pivotal trial reported 2003 (>15 years)
47 Vaccines what is hot? Vaccines elicit immune responses These responses: prevent infectious diseases (ie. prophylaxis) cure existing infectious diseases (ie. therapeutic) block physiology (eg. anti-hormone, fertility...) prevent and cure cancers (eg. antiviral, anticancer) block autoimmune, allergic reactions (eg. desensitize)
48 Therapeutic Vaccines Vaccines in advanced development for: - HPV-induced cancers, pre-cancerous conditions eg. anal dysplasia, cervical dysplasia (eg. CSL) - Therapy for HIV (eg. Virax) - Chronic HBV, HCV infections (CTL-based, CSL)..
49 Greater purity better adjuvants Toll-like receptors the basis of adjuvants ( immunology s dirty little secret ) TLRs stimulate innate responses, activate acquired immune responses TLRs are a series of cell surface receptors which act through common signalling pathways (eg. MyD88) -> cytokines eg. TNF-α Recognise bacterial products eg. flagella (TLR5), LPS (TLR4), Lipoproteins (TLR2), bacterial ie. methylated DNA (CpG TLR9) Basis of immunostimulation by Mtb in FCA?
50 Greater purity better antigens CTL determinants peptides (9-11, 14+ aa) Force dominance of the immune response String minimal epitopes together = Polytope Deliver from live vectors (adenovirus, MVA Combine with DNA vaccine prime (primeboost) Tested in HIV et al. HPV Ian Frazer, VLPs with CSL/Merck $US300m+ Phase III (highly protective in PII)
51 Vaccines Summary Vaccines are important public/individual health tools Work through the immune system Expensive to develop Usually effective New vaccines are needed, but understanding of basic disease biology equally important Vaccines entering new fields such as therapy Exciting and challenging area
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