Pharmacotherapeutic group: vaccines, pneumococcal vaccines, ATC code: J07AL02
Mechanism of action
CAPVAXIVE contains 21 pneumococcal capsular polysaccharides from Streptococcus pneumoniae (3, 6A, 7F, 8, 9N, 10A, 11A, 12F, 15A, deOAc15B, 16F, 17F, 19A, 20A, 22F, 23A, 23B, 24F, 31, 33F, and 35B), which are known to contribute to the pathogenicity of pneumococci in adults. Each serotype of activated polysaccharide is individually conjugated to a carrier protein (CRM197), and elicits antibodies that enhance opsonisation, phagocytosis, and killing of pneumococci to protect against pneumococcal disease. CAPVAXIVE elicits a T-cell dependent immune response. Carrier protein-specific helper T-cells support specificity, functionality, and maturation of serotype-specific B-cells.
Immune responses following natural exposure to Streptococcus pneumoniae or following pneumococcal vaccination can be determined through the assessments of opsonophagocytic activity (OPA) responses, to assess functional antibodies capable of opsonizing pneumococcal capsular polysaccharides for presentation to phagocytic cells for engulfment and subsequent killing. OPA responses are considered an important immunologic surrogate measure of protection against pneumococcal disease in adults. Specific threshold values that correlate with protection in adults have not been defined. There is a positive correlation between OPA responses and anti-capsular Immunoglobulin G (IgG) responses.
Serotype‑specific immune responses (OPA and IgG) for the 21 serotypes contained in CAPVAXIVE and the cross-reactive serotype 15B were measured using a validated multiplexed opsonophagocytic assay (MOPA) and pneumococcal electrochemiluminescence (Pn ECL) assay. Serotype 15C represents the immune response to the deOAc15B polysaccharide as the molecular structure for deOAc15B and 15C are similar.
Clinical efficacy and safety
Clinical trials experience in individuals 18 years of age and older
Six Phase 3, clinical studies (Protocol 003, Protocol 004, Protocol 005, Protocol 006, Protocol 007, and Protocol 010) conducted across the Americas, Europe, Asia Pacific and Africa evaluated the immunogenicity of CAPVAXIVE in 8 369 individuals 18 years of age and older, of whom 5 450 received CAPVAXIVE. Participants enrolled in the Phase 3 studies included adults across different age groups; approximately 32% were 18 to 49 years of age, 32% were 50 to 64 years of age, 29% were 65 to 74 years of age, and 8% were 75 years of age and older. Of those vaccinated, 14% had received other prior pneumococcal vaccines, 33% had risk factors for pneumococcal disease (e.g., alcoholism, chronic heart disease, chronic liver disease, chronic lung disease including asthma, diabetes, renal disorders, smoking) and approximately 4% were adults living with HIV, which is associated with high risk of pneumococcal disease.
In each study, immunogenicity was assessed by serotype‑specific OPA and IgG responses at 1-month postvaccination.
Clinical trials conducted in pneumococcal vaccine‑naïve adults
CAPVAXIVE effectiveness in adults against invasive pneumococcal disease and pneumonia was assessed based on comparative immunogenicity to a licensed pneumococcal vaccine (pneumococcal 20-valent conjugate vaccine (PCV20) and PPSV23).
Protocol 003
In a double-blind study, 2 362 pneumococcal vaccine-naïve individuals 50 years of age and older were randomised to receive either CAPVAXIVE or PCV20. The immune response as assessed by the geometric mean titre (GMT) ratio (CAPVAXIVE/PCV20) is presented in Table 2.
CAPVAXIVE met the pre-defined statistical noninferiority criterion compared to PCV20 for the 10 serotypes included in both vaccines as assessed by the geometric mean titre (GMT) ratio (CAPVAXIVE/PCV20) where the noninferiority criterion was met if the lower bound of the 2-sided 95% Confidence Interval (CI) were ˃ 0.5. CAPVAXIVE met the predefined superiority criterion compared to PCV20 for all but one (15C) of the 11 additional serotypes to CAPVAXIVE as assessed by the GMT ratio (CAPVAXIVE/PCV20) where the statistical superiority criterion was met if the lower bound of the 2-sided 95% CI were ˃ 2.0 (see Table 2).
Table 2: Serotype‑specific OPA GMTs in pneumococcal vaccine‑naïve individuals ≥ 50 years of age (Protocol 003)
| Pneumococcal Serotype | CAPVAXIVE (N=1 179) | PCV 20 (N=1 177) | GMT Ratio* (CAPVAXIVE/PCV20) (95% CI)* |
| n | GMT* | n | GMT* |
| 10 Shared Serotypes† |
| 3 | 1 154 | 274.0 | 1 161 | 176.7 | 1.55 (1.40, 1.72) |
| 6A | 1 148 | 2 302.0 | 1 153 | 2 972.5 | 0.77 (0.68, 0.88) |
| 7F | 1 152 | 3 637.4 | 1 158 | 3 429.9 | 1.06 (0.95, 1.18) |
| 8 | 1 155 | 2 501.3 | 1 158 | 1 811.1 | 1.38 (1.25, 1.53) |
| 10A | 1 161 | 3 893.4 | 1 159 | 4 678.0 | 0.83 (0.75, 0.93) |
| 11A | 1 145 | 3 232.6 | 1 150 | 2 092.8 | 1.54 (1.39, 1.72) |
| 12F | 1 160 | 2 641.2 | 1 161 | 2 499.6 | 1.06 (0.92, 1.21) |
| 19A | 1 159 | 2 136.1 | 1 162 | 2 817.8 | 0.76 (0.69, 0.84) |
| 22F | 1 147 | 3 874.5 | 1 154 | 4 770.1 | 0.81 (0.72, 0.92) |
| 33F | 1 154 | 13 558.9 | 1 157 | 11 742.1 | 1.15 (1.01, 1.32) |
| 11 Additional Serotypes in CAPVAXIVE‡ |
| 9N | 1 147 | 7 470.7 | 1 150 | 1 640.4 | 4.55 (4.12, 5.04) |
| 15A | 1 107 | 5 237.2 | 1 102 | 1 589.0 | 3.30 (2.91, 3.74) |
| 15C | 1 153 | 4 216.2 | 1 158 | 2 072.3 | 2.03 (1.77, 2.34) |
| 16F | 1 151 | 4 868.2 | 1 153 | 846.3 | 5.75 (5.16, 6.41) |
| 17F | 1 148 | 7 764.9 | 1 156 | 460.4 | 16.86 (14.90, 19.09) |
| 20A | 1 161 | 6 099.2 | 1 155 | 631.1 | 9.66 (8.66, 10.79) |
| 23A | 1 132 | 3 737.2 | 1 104 | 461.5 | 8.10 (6.86, 9.55) |
| 23B | 1 160 | 1 082.5 | 1 160 | 107.3 | 10.09 (8.48, 12.00) |
| 24F | 1 153 | 2 728.6 | 1 130 | 70.5 | 38.71 (33.87, 44.25) |
| 31 | 1 153 | 3 132.5 | 1 154 | 144.4 | 21.69 (18.68, 25.18) |
| 35B | 1 153 | 8 527.8 | 1 159 | 1 383.0 | 6.17 (5.59, 6.80) |
| Cross-reactive serotype |
| 15B | 1 140 | 4 400.6 | 1 141 | 4 640.0 | 0.95 (0.84, 1.07) |
* GMTs, GMT ratio, and 95% CI were estimated from a constrained Longitudinal Data Analysis model.
† The noninferiority criterion was met if the lower bound of the 2-sided 95% CI for the estimated GMT ratio (CAPVAXIVE/PCV20) was > 0.5.
‡ The superiority criterion was met if the lower bound of the 2-sided 95% CI for the estimated GMT ratio (CAPVAXIVE/PCV20) was > 2.0.
N=Number of individuals randomised and vaccinated; n=Number of individuals contributing to the analysis.
CAPVAXIVE met the superiority criterion compared to PCV20 for 10 of additional 11 serotypes (except 15C) in CAPVAXIVE as assessed by the proportion of individuals who achieved a ≥ 4-fold rise from prevaccination to 1-month postvaccination for OPA responses. The superiority criterion was defined as the difference between CAPVAXIVE and PCV20 being > 10 percentage points.
Immunobridging in pneumococcal vaccine-naïve individuals 18 to 49 years of age
In a double-blind study pneumococcal vaccine-naïve individuals 18 to 49 years of age were randomised in a 2:1 ratio to receive CAPVAXIVE (N=200) or PCV20 (N=100). The 18 to 49 year old group who received CAPVAXIVE (N=200) was compared to the 50 to 64 year old group (N=589) which also had received CAPVAXIVE to evaluate the OPA responses.
CAPVAXIVE successfully immunobridged serotype-specific immune responses to each of the 21 vaccine serotypes in individuals 18 to 49 years of age to individuals 50 to 64 years of age, as the lower bound of the 2-sided 95% CI for the GMT ratio for each serotype was > 0.5 (see Table 3).
Table 3: Comparison of serotype‑specific OPA GMTs in pneumococcal vaccine‑naïve individuals 18-49 years of age to 50-64 years of age who received CAPVAXIVE (Protocol 003)
| Pneumococcal Serotype | 18-49 years (N=200) | 50-64 years (N=589) | GMT Ratio*† (18-49 years/50-64 years) (95% CI)* |
| | n | GMT | n | GMT | |
| 3 | 194 | 308.6 | 572 | 282.7 | 1.09 (0.90, 1.33) |
| 6A | 196 | 5 289.6 | 569 | 2 572.9 | 2.06 (1.61, 2.62) |
| 7F | 198 | 6 447.2 | 571 | 4 278.8 | 1.51 (1.23, 1.84) |
| 8 | 197 | 4 516.0 | 571 | 3 004.7 | 1.50 (1.26, 1.79) |
| 9N | 197 | 17 283.2 | 570 | 8 791.4 | 1.97 (1.59, 2.43) |
| 10A | 197 | 6 808.1 | 575 | 4 382.6 | 1.55 (1.26, 1.92) |
| 11A | 196 | 5 871.6 | 564 | 3 785.8 | 1.55 (1.26, 1.91) |
| 12F | 196 | 6 150.4 | 574 | 3 561.2 | 1.73 (1.37, 2.17) |
| 15A | 184 | 11 319.2 | 550 | 5 901.2 | 1.92 (1.55, 2.37) |
| 15C | 195 | 10 194.0 | 570 | 5 708.0 | 1.79 (1.36, 2.35) |
| 16F | 193 | 8 877.0 | 571 | 5 720.0 | 1.55 (1.26, 1.91) |
| 17F | 194 | 16 070.6 | 568 | 10 068.0 | 1.60 (1.26, 2.02) |
| 19A | 198 | 2 773.2 | 574 | 2 374.6 | 1.17 (0.97, 1.40) |
| 20A | 197 | 13 150.0 | 575 | 7 562.7 | 1.74 (1.39, 2.18) |
| 22F | 198 | 9 299.6 | 568 | 4 683.6 | 1.99 (1.58, 2.49) |
| 23A | 192 | 8 848.7 | 561 | 4 739.5 | 1.87 (1.43, 2.44) |
| 23B | 198 | 2 140.1 | 575 | 1 420.9 | 1.51 (1.11, 2.04) |
| 24F | 197 | 4 137.6 | 570 | 3 047.2 | 1.36 (1.10, 1.67) |
| 31 | 195 | 8 005.6 | 570 | 3 820.7 | 2.10 (1.63, 2.69) |
| 33F | 197 | 34 805.5 | 570 | 17 607.4 | 1.98 (1.52, 2.57) |
| 35B | 198 | 13 933.4 | 573 | 9 053.9 | 1.54 (1.26, 1.87) |
* GMTs, GMT ratio, and 95% CI were estimated from a Longitudinal Data Analysis model.
† A conclusion of immunobridging was based on the lower bound of the 95% CI for the estimated GMT ratio (18‑49 years / 50‑64 years) being > 0.5.
N=Number of individuals randomised and vaccinated; n=Number of individuals contributing to the analysis.
Protocol 010
In a double-blind study, 1 484 pneumococcal vaccine-naïve individuals 50 years of age and older were randomised to receive either CAPVAXIVE or PPSV23; 46% of participants were 50 to 64 years of age, 54% were 65 years of age and older, and 10% were 75 years of age and older. The immune response as assessed by the GMT ratio (CAPVAXIVE/PPSV23) is presented in Table 4.
CAPVAXIVE met the pre-defined statistical noninferiority criterion compared to PPSV23 for the 12 serotypes included in both vaccines as assessed by the GMT ratio (CAPVAXIVE/PPSV23) where the noninferiority criterion was met if the lower bound of the 2-sided 95% Confidence Interval (CI) were > 0.5. CAPVAXIVE met the predefined superiority criterion compared to PPSV23 for the 9 additional serotypes to CAPVAXIVE as assessed by the GMT ratio (CAPVAXIVE/PPSV23) where the statistical superiority criterion was met if the lower bound of the 2-sided 95% CI were > 2.0 (see Table 4).
Table 4: Serotype specific OPA GMTs in pneumococcal vaccine-naïve individuals 50 years of age and older (Protocol 010)
| Pneumococcal Serotype | CAPVAXIVE (N=739) | PPSV23 (N=741) | GMT Ratio* (CAPVAXIVE/PPSV23) (95% CI)* |
| n | GMT* | n | GMT* |
| 12 Shared Serotypes† |
| 3 | 725 | 230.4 | 729 | 211.5 | 1.09 (0.96, 1.23) |
| 7F | 729 | 4 876.7 | 732 | 3 314.6 | 1.47 (1.29, 1.68) |
| 8 | 730 | 3 379.6 | 733 | 2 882.1 | 1.17 (1.04, 1.32) |
| 9N | 728 | 7 346.6 | 729 | 6 545.9 | 1.12 (1.00, 1.26) |
| 10A | 725 | 4 382.9 | 726 | 2 818.7 | 1.55 (1.37, 1.77) |
| 11A | 728 | 3 711.1 | 729 | 1 809.7 | 2.05 (1.82, 2.31) |
| 12F | 728 | 3 031.8 | 732 | 1 854.9 | 1.63 (1.40, 1.90) |
| 17F | 722 | 8 215.7 | 730 | 4 060.5 | 2.02 (1.77, 2.31) |
| 19A | 731 | 2 670.0 | 732 | 1 879.9 | 1.42 (1.26, 1.60) |
| 20A | 730 | 6 966.1 | 733 | 4 208.4 | 1.66 (1.46, 1.88) |
| 22F | 725 | 4 724.1 | 728 | 3 084.9 | 1.53 (1.34, 1.75) |
| 33F | 727 | 15 497.3 | 731 | 17 483.0 | 0.89 (0.76, 1.04) |
| 9 Additional Serotypes in CAPVAXIVE‡ |
| 6A | 729 | 3 193.9 | 730 | 964.0 | 3.31 (2.84, 3.87) |
| 15A | 715 | 6 746.5 | 703 | 1 462.1 | 4.61 (3.99, 5.33) |
| 15C | 729 | 7 604.8 | 730 | 2 605.0 | 2.92 (2.50, 3.42) |
| 16F | 726 | 6 675.4 | 723 | 1 482.2 | 4.50 (3.99, 5.09) |
| 23A | 711 | 4 804.2 | 690 | 837.2 | 5.74 (4.81, 6.85) |
| 23B | 730 | 2 252.6 | 726 | 137.2 | 16.42 (13.46, 20.03) |
| 24F | 723 | 4 568.0 | 705 | 1 346.7 | 3.39 (2.97, 3.87) |
| 31 | 730 | 5 040.7 | 731 | 423.9 | 11.89 (10.16, 13.91) |
| 35B | 728 | 10 707.5 | 732 | 1 735.0 | 6.17 (5.54, 6.87) |
| Cross-reactive serotype |
| 15B | 716 | 5 157.3 | 727 | 3 243.2 | 1.59 (1.37, 1.85) |
* GMTs, GMT ratio, and 95% CI were estimated from a constrained Longitudinal Data Analysis model.
† The noninferiority criterion was met if the lower bound of the 2-sided 95% CI for the estimated GMT ratio (CAPVAXIVE/PPSV23) was > 0.5.
‡ The superiority criterion was met if the lower bound of the 2-sided 95% CI for the estimated GMT ratio (CAPVAXIVE/PPSV23) was > 2.0.
N=Number of individuals randomised and vaccinated; n=Number of individuals contributing to the analysis.
CAPVAXIVE met the superiority criterion compared to PPSV23 for 8 of 9 additional serotypes (except 15C) in CAPVAXIVE as assessed by the proportion of individuals who achieved a ≥ 4-fold rise from prevaccination to 1-month postvaccination for OPA responses. The superiority criterion was defined as the difference between CAPVAXIVE and PPSV23 being ˃ 10 percentage points.
Clinical trials conducted in adults with prior pneumococcal vaccination
Protocol 006
A descriptive Phase 3 study, enrolled individuals 50 years of age and older who were previously vaccinated with other pneumococcal vaccines at least 1 year prior to study entry. Subjects were randomised to receive CAPVAXIVE or another pneumococcal vaccine.
Across all 3 cohorts, CAPVAXIVE was immunogenic for all 21 serotypes contained in the vaccine as assessed by serotype-specific OPA GMTs. OPA GMTs were generally comparable between the two vaccination groups for the shared serotypes and higher in the CAPVAXIVE group for the additional serotypes included only in CAPVAXIVE.
Special populations
Adults living with HIV
Protocol 007
In a double-blind study, 313 adults living with HIV, with or without a history of prior pneumococcal vaccination, were randomised in a 1:1 ratio to receive either CAPVAXIVE followed by placebo 8 weeks later, or PCV15 followed by PPSV23 (PCV15+PPSV23) 8 weeks later. At screening, of the participants vaccinated 6.7% had a CD4+ T-cell counts ≥ 50 to < 350 cells/µL, 18.6% had CD4+ T‑cell counts ≥ 350 to < 500 cells/µL and 74.7% had a CD4+ T-cell counts ≥ 500 cells/µL; 83% had an undetectable HIV viral load (< 20 copies/mL).
CAPVAXIVE was immunogenic for all 21 serotypes contained in the vaccine, as assessed by serotype specific OPA GMTs at 1-month postvaccination with CAPVAXIVE. CAPVAXIVE elicited immune responses that were generally comparable to PCV15+PPSV23 for the 13 common serotypes and higher for the 8 serotypes additional to CAPVAXIVE as assessed by OPA GMTs at 1-month postvaccination with CAPVAXIVE and 1-month postvaccination with PCV15+PPSV23.
Adults with increased risk for pneumococcal disease
Protocol 008
In a double-blind study, 518 individuals 18 to 64 years of age with one or more prespecified chronic medical conditions known to increase the risk of pneumococcal disease (diabetes mellitus, chronic heart disease, chronic kidney disease, chronic liver disease, or chronic lung disease) were randomised in a 3:1 ratio to receive either CAPVAXIVE followed by placebo 8 weeks later, or PCV15 followed by PPSV23 (PCV15+PPSV23) 8 weeks later. The study participants had not previously received any pneumococcal vaccines other than routine childhood PCVs.
CAPVAXIVE was immunogenic for all 21 serotypes contained in the vaccine, as assessed by serotype specific OPA GMTs at 1‑month postvaccination with CAPVAXIVE. CAPVAXIVE elicited immune responses that were generally comparable to PCV15+PPSV23 for the 13 common serotypes and higher for the 8 serotypes additional to CAPVAXIVE as assessed by OPA GMTs at 1‑month postvaccination with CAPVAXIVE and 1‑month postvaccination with PCV15+PPSV23.
Paediatric population
Clinical trials experience in children and adolescents 2 to less than 18 years of age
Protocol 013
In a double-blind study, 874 individuals 2 to less than 18 years of age with one or more prespecified chronic medical conditions known to increase the risk of pneumococcal disease and who completed a primary pneumococcal vaccination regimen at least 8 weeks prior to enrolment were randomised in a 3:2 ratio to receive either CAPVAXIVE or PPSV23. Among the vaccinated participants, 135 (15.4%) had diabetes mellitus only, 143 (16.4%) had chronic heart disease only, 76 (8.7%) had chronic kidney disease only, 60 (6.9%) had chronic liver disease only, 499 (57.1%) had chronic lung disease only, and 36 (4.1%) had ≥ 2 increased-risk conditions. Immunogenicity was assessed by OPA GMTs at 1-month postvaccination with either CAPVAXIVE or PPSV23.
CAPVAXIVE met the pre-defined statistical noninferiority criterion compared to PPSV23 for the 12 serotypes included in both vaccines as assessed by the GMT ratio (CAPVAXIVE/PPSV23) where the noninferiority criterion was met if the lower bound of the 2-sided 95% CI were ˃ 0.5. CAPVAXIVE met the predefined superiority criterion compared to PPSV23 for the 9 additional serotypes to CAPVAXIVE as assessed by the GMT ratio (CAPVAXIVE/PPSV23) where the statistical superiority criterion was met if the lower bound of the 2-sided 95% CI were > 2.0 (see Table 5).
Table 5: Serotype‑specific OPA GMTs in children and adolescents 2 to less than 18 years of age with increased risk of pneumococcal disease (Protocol 013)
| Pneumococcal Serotype | CAPVAXIVE (N=527) | PPSV23 (N=347) | GMT Ratio* (CAPVAXIVE/PPSV23) (95% CI)* |
| n | GMT* | n | GMT* |
| 12 Shared Serotypes† |
| 3 | 488 | 526.6 | 314 | 517.0 | 1.02 (0.89, 1.17) |
| 7F | 486 | 20 618.1 | 315 | 14 207.2 | 1.45 (1.24, 1.70) |
| 8 | 485 | 12 294.5 | 313 | 8 966.9 | 1.37 (1.20, 1.56) |
| 9N | 485 | 35 556.8 | 315 | 18 587.8 | 1.91 (1.64, 2.23) |
| 10A | 485 | 13 719.7 | 311 | 5 363.8 | 2.56 (2.18, 3.00) |
| 11A | 486 | 10 396.3 | 312 | 3 129.8 | 3.32 (2.80, 3.95) |
| 12F | 486 | 14 752.0 | 314 | 4 820.1 | 3.06 (2.62, 3.58) |
| 17F | 481 | 40 011.8 | 312 | 11 267.4 | 3.55 (3.02, 4.17) |
| 19A | 486 | 9 009.8 | 314 | 9 797.6 | 0.92 (0.78, 1.08) |
| 20A | 480 | 37 532.2 | 311 | 14 787.0 | 2.54 (2.13, 3.02) |
| 22F | 487 | 20 162.7 | 313 | 7 770.3 | 2.59 (2.21, 3.04) |
| 33F | 488 | 73 201.8 | 314 | 40 609.0 | 1.80 (1.54, 2.11) |
| 9 Additional Serotypes in CAPVAXIVE‡ |
| 6A | 480 | 16 910.9 | 311 | 5 653.8 | 2.99 (2.46, 3.64) |
| 15A | 485 | 69 527.8 | 315 | 5 332.2 | 13.04 (11.13, 15.27) |
| 15C | 480 | 34 539.1 | 308 | 4 398.4 | 7.85 (6.29, 9.81) |
| 16F | 485 | 31 544.9 | 313 | 5 449.7 | 5.79 (5.01, 6.69) |
| 23A | 474 | 28 591.7 | 296 | 4 882.0 | 5.86 (4.88, 7.03) |
| 23B | 485 | 5 988.2 | 312 | 370.5 | 16.16 (12.03, 21.72) |
| 24F | 478 | 11 102.2 | 297 | 2 771.8 | 4.01 (3.40, 4.72) |
| 31 | 484 | 46 163.7 | 311 | 2 563.0 | 18.01 (15.09, 21.50) |
| 35B | 482 | 40 102.8 | 311 | 7 812.5 | 5.13 (4.45, 5.93) |
| Cross-reactive serotype |
| 15B | 483 | 18 395.6 | 307 | 4 863.4 | 3.78 (3.03, 4.73) |
* GMTs, GMT ratio, and 95% CI were estimated from a constrained Longitudinal Data Analysis model.
† A conclusion of non‑inferiority for the common serotypes was based on the lower bound of the 2‑sided 95% CI for the estimated GMT ratio (CAPVAXIVE/PPSV23) being ˃ 0.5.
‡ A conclusion of superiority for the additional serotypes in CAPVAXIVE compared to PPSV23 was based on the lower bound of the 2‑sided 95% CI for the estimated GMT ratio (CAPVAXIVE/PPSV23) being > 2.0.
N=Number of individuals randomised and vaccinated; n=Number of individuals contributing to the analysis.