The effectiveness of CAPVAXIVE in individuals 18 years of age and older for the prevention of invasive disease caused by S. pneumoniae serotypes 3, 6A, 7F, 8, 9N, 10A, 11A, 12F, 15A, 15B, 15C, 16F, 17F, 19A, 20A, 22F, 23A, 23B, 24F, 31, 33F and 35B and for the prevention of pneumonia caused by S. pneumoniae serotypes 3, 6A, 7F, 8, 9N, 10A, 11A, 12F, 15A, 15C, 16F, 17F, 19A, 20A, 22F, 23A, 23B, 24F, 31, 33F, and 35B was demonstrated based on comparative immunogenicity to a licensed pneumococcal vaccine (Prevnar 20).
Pneumococcal Vaccine-Naïve Individuals 50 years of age and older
In Study 1, 2,362 pneumococcal vaccine-naïve individuals 50 years of age and older were randomized to receive either CAPVAXIVE or Prevnar 20. [see Adverse Reactions (6.1).]
Table 4 summarizes the 21 serotype-specific OPA geometric mean antibody titers (GMTs) at 30 days postvaccination. The study demonstrated that CAPVAXIVE is noninferior to Prevnar 20 for the 10 shared serotype polysaccharides and induces statistically significantly greater OPA GMTs compared to Prevnar 20 for 10 of 11 serotype polysaccharides unique to CAPVAXIVE. Serotype 15C did not meet the criterion for statistical significance.
Table 5 summarizes the proportion of individuals who achieved a ≥4-fold rise from prevaccination to 1-month postvaccination for OPA responses. For 10 of 11 serotype polysaccharides unique to CAPVAXIVE, CAPVAXIVE induced statistically significantly greater OPA responses compared to Prevnar 20. Serotype 15C did not meet the criterion for statistical significance.
Table 4: Serotype-Specific OPA GMTs in Pneumococcal Vaccine-Naïve Individuals 50 Years of Age and Older (Study 1)Pneumococcal Serotype | CAPVAXIVE (N = 1179) | Prevnar 20 (N = 1177) | GMT Ratio GMTs, GMT ratio, and 95% CI were estimated from a constrained Longitudinal Data Analysis model. (CAPVAXIVE/Prevnar 20) (95% CI) |
|---|
| n | GMT | n | GMT | |
|---|
| N=Number of individuals randomized and vaccinated; n=Number of individuals contributing to the analysis. |
| 10 Common Serotypes Non-inferiority for the serotypes common to CAPVAXIVE and Prevnar 20 was based on the lower bound of the 2-sided 95% CI for the estimated GMT ratio (CAPVAXIVE/Prevnar 20) being >0.5. | |
| 3 | 1154 | 274.0 | 1161 | 176.7 | 1.55 (1.40, 1.72) |
| 6A | 1148 | 2302.0 | 1153 | 2972.5 | 0.77 (0.68, 0.88) |
| 7F | 1152 | 3637.4 | 1158 | 3429.9 | 1.06 (0.95, 1.18) |
| 8 | 1155 | 2501.3 | 1158 | 1811.1 | 1.38 (1.25, 1.53) |
| 10A | 1161 | 3893.4 | 1159 | 4678.0 | 0.83 (0.75, 0.93) |
| 11A | 1145 | 3232.6 | 1150 | 2092.8 | 1.54 (1.39, 1.72) |
| 12F | 1160 | 2641.2 | 1161 | 2499.6 | 1.06 (0.92, 1.21) |
| 19A | 1159 | 2136.1 | 1162 | 2817.8 | 0.76 (0.69, 0.84) |
| 22F | 1147 | 3874.5 | 1154 | 4770.1 | 0.81 (0.72, 0.92) |
| 33F | 1154 | 13558.9 | 1157 | 11742.1 | 1.15 (1.01, 1.32) |
| 11 Serotypes Unique to CAPVAXIVE Statistically significantly greater OPA responses for the serotypes unique to CAPVAXIVE compared to Prevnar 20 were based on the lower bound of the 2-sided 95% CI for the estimated GMT ratio (CAPVAXIVE/Prevnar 20) being >2.0. | |
| 9N | 1147 | 7470.7 | 1150 | 1640.4 | 4.55 (4.12, 5.04) |
| 15A | 1107 | 5237.2 | 1102 | 1589.0 | 3.30 (2.91, 3.74) |
| 15C | 1153 | 4216.2 | 1158 | 2072.3 | 2.03 (1.77, 2.34) |
| 16F | 1151 | 4868.2 | 1153 | 846.3 | 5.75 (5.16, 6.41) |
| 17F | 1148 | 7764.9 | 1156 | 460.4 | 16.86 (14.90, 19.09) |
| 20A | 1161 | 6099.2 | 1155 | 631.1 | 9.66 (8.66, 10.79) |
| 23A | 1132 | 3737.2 | 1104 | 461.5 | 8.10 (6.86, 9.55) |
| 23B | 1160 | 1082.5 | 1160 | 107.3 | 10.09 (8.48, 12.00) |
| 24F | 1153 | 2728.6 | 1130 | 70.5 | 38.71 (33.87, 44.25) |
| 31 | 1153 | 3132.5 | 1154 | 144.4 | 21.69 (18.68, 25.18) |
| 35B | 1153 | 8527.8 | 1159 | 1383.0 | 6.17 (5.59, 6.80) |
Table 5: Pneumococcal Vaccine-Naïve Individuals 50 years of Age and Older With a ≥4-Fold Rise in OPA Responses for Serotypes Unique to CAPVAXIVE (Study 1)Pneumococcal Serotype | CAPVAXIVE (N=1179) | Prevnar 20 (N=1177) | Percentage Point Difference (CAPVAXIVE – Prevnar 20) |
|---|
Observed Response Percentage (m/n) | Observed Response Percentage (m/n) | Estimate (95% CI) Estimated difference and CI were based on the stratified Miettinen & Nurminen method. ,Statistically significantly greater OPA responses were based on the lower bound of the 2-sided 95% CI of the differences (CAPVAXIVE – Prevnar 20) between the percentages of individuals with a ≥4-fold rise from prevaccination to 1-month postvaccination being >10 percentage points. |
|---|
| N=Number of individuals randomized and vaccinated; m=Number of individuals with the indicated response; n=Number of individuals contributing to the analysis |
| 9N | 64.7 (595/920) | 19.9 (195/978) | 44.7 (40.7, 48.6) |
| 15A | 66.7 (462/693) | 35.8 (253/706) | 30.9 (25.8, 35.8) |
| 15C | 83.4 (794/952) | 74.2 (695/937) | 9.2 (5.6, 12.9) |
| 16F | 71.9 (654/910) | 20.8 (200/961) | 51.1 (47.1, 54.9) |
| 17F | 75.8 (653/862) | 9.5 (90/952) | 66.3 (62.8, 69.6) |
| 20A | 67.3 (675/1003) | 9.6 (97/1011) | 57.7 (54.2, 61.1) |
| 23A | 78.9 (598/758) | 36.8 (270/734) | 42.2 (37.6, 46.6) |
| 23B | 85.5 (873/1021) | 49.6 (506/1021) | 35.9 (32.1, 39.6) |
| 24F | 80.5 (745/925) | 6.3 (55/872) | 74.2 (71.1, 77.1) |
| 31 | 76.5 (698/912) | 17.9 (171/954) | 58.6 (54.8, 62.1) |
| 35B | 60.0 (550/917) | 6.8 (67/988) | 53.2 (49.6, 56.6) |
In Study 1, 64.7% of individuals 50 years of age and older, who received CAPVAXIVE, had ≥4-fold rise in cross-reactive OPA titers for serotype 15B, which met the prespecified success criterion (lower bound of the 2-sided 95% CI of the proportion of individuals with a ≥4-fold rise in OPA responses is >50%). In a descriptive analysis, the S. pneumoniae serotype 15B OPA GMT was 4,400.6 following administration of CAPVAXIVE, and 4,640.0 following administration of Prevnar 20, with a GMT ratio of 0.95 (95% CI: 0.84, 1.07).
Pneumococcal Vaccine-Naïve Individuals 18 through 49 Years of Age
In Study 1, pneumococcal vaccine-naïve individuals 18 through 49 years of age were randomized in a 2:1 ratio to receive CAPVAXIVE or Prevnar 20. [See Adverse Reactions (6.1).]
Effectiveness of CAPVAXIVE in individuals 18 through 49 years of age was assessed by a comparison of the OPA responses induced by CAPVAXIVE in this age group to the OPA responses of individuals 50 through 64 years of age. The OPA responses of individuals 18 through 49 years of age to each of 22 S. pneumoniae serotypes met the criteria for immunobridging as the lower bound of the 2-sided 95% CI for the GMT ratio for each serotype was >0.5 (see Table 6). The S. pneumoniae serotype 15B cross-reactive OPA GMT was 10,976.7 following administration of CAPVAXIVE in individuals 18 through 49 years of age and 5,438.9 following administration of CAPVAXIVE in individuals 50 through 64 years of age, with a GMT ratio of 2.02 (95% CI: 1.57, 2.60).
Table 6: Comparison of Serotype-Specific OPA GMTs in Pneumococcal Vaccine-Naïve Individuals 18 through 49 Years of Age to 50 through 64 Years of Age Who Received CAPVAXIVE (Study 1)Pneumococcal Serotype | 18 through 49 years (N = 200) | 50 through 64 years (N = 589) | GMT Ratio GMTs, GMT ratio, and 95% CI were estimated from a Longitudinal Data Analysis model. ,Immunobridging was based on the lower bound of the 2-sided 95% CI for the estimated GMT ratio (18 through 49 years / 50 through 64 years) being >0.5. (18 through 49 years / 50 through 64 years) (95% CI) |
|---|
| n | GMT | n | GMT | |
|---|
| N=Number of individuals randomized and vaccinated; n=Number of individuals contributing to the analysis. |
| 3 | 194 | 308.6 | 572 | 282.7 | 1.09 (0.90, 1.33) |
| 6A | 196 | 5289.6 | 569 | 2572.9 | 2.06 (1.61, 2.62) |
| 7F | 198 | 6447.2 | 571 | 4278.8 | 1.51 (1.23, 1.84) |
| 8 | 197 | 4516.0 | 571 | 3004.7 | 1.50 (1.26, 1.79) |
| 9N | 197 | 17283.2 | 570 | 8791.4 | 1.97 (1.59, 2.43) |
| 10A | 197 | 6808.1 | 575 | 4382.6 | 1.55 (1.26, 1.92) |
| 11A | 196 | 5871.6 | 564 | 3785.8 | 1.55 (1.26, 1.91) |
| 12F | 196 | 6150.4 | 574 | 3561.2 | 1.73 (1.37, 2.17) |
| 15A | 184 | 11319.2 | 550 | 5901.2 | 1.92 (1.55, 2.37) |
| 15C | 195 | 10194.0 | 570 | 5708.0 | 1.79 (1.36, 2.35) |
| 16F | 193 | 8877.0 | 571 | 5720.0 | 1.55 (1.26, 1.91) |
| 17F | 194 | 16070.6 | 568 | 10068.0 | 1.60 (1.26, 2.02) |
| 19A | 198 | 2773.2 | 574 | 2374.6 | 1.17 (0.97, 1.40) |
| 20A | 197 | 13150.0 | 575 | 7562.7 | 1.74 (1.39, 2.18) |
| 22F | 198 | 9299.6 | 568 | 4683.6 | 1.99 (1.58, 2.49) |
| 23A | 192 | 8848.7 | 561 | 4739.5 | 1.87 (1.43, 2.44) |
| 23B | 198 | 2140.1 | 575 | 1420.9 | 1.51 (1.11, 2.04) |
| 24F | 197 | 4137.6 | 570 | 3047.2 | 1.36 (1.10, 1.67) |
| 31 | 195 | 8005.6 | 570 | 3820.7 | 2.10 (1.63, 2.69) |
| 33F | 197 | 34805.5 | 570 | 17607.4 | 1.98 (1.52, 2.57) |
| 35B | 198 | 13933.4 | 573 | 9053.9 | 1.54 (1.26, 1.87) |
Individuals 50 years of age and older with Prior Pneumococcal Vaccination
Study 3, 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. Participants were enrolled into 1 of 3 cohorts based on their pneumococcal vaccination history (cohort 1: PNEUMOVAX 23, cohort 2: Prevnar 13, or cohort 3: PNEUMOVAX 23 followed by or preceded by Prevnar 13, PNEUMOVAX 23 preceded by VAXNEUVANCE, or VAXNEUVANCE alone).
Participants in cohort 1 were randomized to receive CAPVAXIVE (n=231) or VAXNEUVANCE (n=119), participants in cohort 2 were randomized to receive CAPVAXIVE (n=176) or PNEUMOVAX 23 (n=85), and participants in cohort 3 were allocated to receive CAPVAXIVE (n=106).
In each of the 3 cohorts, serotype-specific OPA GMTs and the proportion of individuals with ≥4-fold rise in OPA responses from baseline to 1-month postvaccination were assessed. In Cohort 1, CAPVAXIVE elicited OPA responses that were comparable to VAXNEUVANCE for the 6 common serotypes, and higher for the 15 unique serotypes and serotype 15B. In Cohort 2, CAPVAXIVE elicited OPA responses comparable to PNEUMOVAX 23 for the 12 common serotypes and serotype 15B, and higher for the 9 unique serotypes. OPA responses to CAPVAXIVE were similar across the 3 cohorts of participants who previously received one or more pneumococcal vaccines.