Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) of Pneumococcal Vaccines for Immunocompromised Children Aged 6 through 18 Years
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Methods
GRADE was used to evaluate 13-valent Pneumococcal Conjugate Vaccine (PCV13) for routine use among immunocompromised children aged 6 through 18 years.
Evidence of benefits, harms, values and preferences, and cost-effectiveness were reviewed in accordance with GRADE methods.[1] The primary policy question was "Should PCV13 be administered routinely to children aged 6 through 18 years with immunocompromising conditions?" Due to the limited body of evidence on vaccine efficacy and safety among persons with most immunocompromising conditions and varying formulations of pneumococcal conjugate vaccines (PCV), 7-,9-, and 13-valent PCVs were evaluated using data for HIV-infected adults and children, and children with sickle cell disease. Studies with PCV7 and PCV9 were used as a proxy when no PCV13 studies were available; PCV7 and PCV9 have the same formulation as PCV13 with 7 antigens in common. The benefits considered in GRADE included critical outcomes of prevention of invasive pneumococcal disease (IPD), pneumococcal pneumonia, death, and hospitalizations due to pneumococcal disease; vaccine-induced immunogenicity was considered an important outcome. The harms considered were serious adverse events and systemic adverse events. Evidence type for each critical or important outcome was derived through a review of study design, risk of bias, inconsistency, indirectness, and imprecision.
Evidence used to evaluate efficacy of PCV13 to prevent IPD was from two randomized controlled trials (RCT): PCV9 among HIV-infected children in South Africa.[2] and of PCV7 among HIV-infected adults in Malawi.[3] The effectiveness of PCV13 against IPD was assumed to be the same as that estimated from a pre/post observational study of PCV7 in children <10 years with sickle cell disease (SCD).[4] Evidence used to evaluate efficacy of PCV13 to prevent critical outcomes of pneumonia and death was from the same RCT in South Africa among HIV-infected children.[2] Evidence was not available for critical outcome of hospitalizations. There are two studies on immunogenicity for children with SCD: an unpublished pre/post study of immunogenicity of PCV13 in children aged 6 through 18,[5] and a published immunogenicity study of PCV7 and PPSV compared to PPSV alone.[6] There are three published studies for HIV-infected children: one pre/post study and two clinical trials for immunogenicity of PCV.[7-9] Four RCTs of PCV7 have been conducted in HIV-infected adults.[10-13] Safety of PCV13 was evaluated based on a pre/post study in children with SCD[5] and three RCTs of PCV7 in HIV-infected adults.[10-12]
Tables
Table 1. Benefits: 13-valent Pneumococcal Conjugate Vaccine in immunocompromised older children
| Outcome | No. subjects (# studies) | Incidence in unvaccinated (cases/100,000) | Incidence in vaccinated (cases/100,000) | Vaccine efficacy (95% CI) | Absolute risk per 100,000 | Number needed to vaccinate |
|---|---|---|---|---|---|---|
| Invasive Pneumococcal Disease | RCTs in HIV-infected individuals | |||||
39,836 | 131 | 45 | 65% | N/A | N/A | |
496 | 7,661 | 2,016 | 74% | N/A | N/A | |
| 197c | 61d | 69% | 135d | 736d | ||
| Retrospective cohort study in children <10 years with sickle cell disease[4] | ||||||
| 1,247 | 1.7 | 0.5 | 81% (19, 96)f | N/A | N/A | |
| Death | 39,836 | 884 | 833 | 6% (P-value=0.63)a | N/A | N/A |
| Pneumonia | 39,836 | 1,049 | 914 | 13% (-7, 29)a | N/A | N/A |
| Immunogenicity- Antibody response to vaccine serotypes | ||||||
| Outcome | Study design | Number in study | Results | |||
| GMFR | PCV13 in children with SCD | |||||
| Pre/Post[5] | 158 | A single dose of PCV13 was immunogenic in SCD patients; none to modest increases in titers post-dose 2 of PCV13 administered 6 months later vs. dose 1 | ||||
| Study design | Number in PCV arm | Number in PPSV23 arm | Results | |||
| PCV7 in children with SCD | ||||||
| GMC | RCT[6] | 11 | 12 | Significant increases in GMC post 1 dose PCV7, no additional benefit post dose 2 of PCV7; response as good or better for some serotypes post 1 dose PCV7 vs PPSV23 | ||
| PCV7 in HIV+ adults | ||||||
| % with ≥4-fold increase in GMT | RCT[10] (2 doses of PCV7 vs. PPSV23) | 15 | 16 | GMTs higher for PCV7 vs. PPSV23 (significance not assessed post 1st doe osf PCV7); % with ≥4-fold increase in GMT higher for PCV7 vs. PPSV23 for 4/5 serotypes (significant for 1/4 serotypes) | ||
| % with ≥2-fold rise in IgG levels and >1µg/ml | RCT[11] | 106 | 106 | No significant difference in outcome between PCV7 and PPSV23 (OR: 1.36, 95%CI 0.82-2.25) | ||
| RCT[12] | 102 | 100 | No significant difference in outcome between PCV7 and PPSV23 | |||
| RCT[13] | 131 | 73 | Greater response for PCV7 vs. PPSV23 (57% vs. 36%, respectively; OR: 2.6 [95% CI, 1.4-5.0]) | |||
| Study design | Number in PCV group | Number in placebo group | Results | |||
| PCV7 in HIV+ children | ||||||
| GMC | Pre/post[7] | 225 | N/A | 76–96% achieved >0.5 µg/mL after 1 dose and 62-88% achieved >1.0 µg/mL after 2 doses of PCV7 for five serotypes tested | ||
| RCT[8] | 30 | 36 | Proportion >0.35 µg/mL: 63-93% (1 month after 3rd dose of PCV9)a; | |||
| RCT[9] | 30 | 15 | >95% achieved 0.15 µg/mL and 80% achieved 0.5 µg/mL after 3rd PCV7 dose; 88-100% achieved a 4-fold rise after 3rd PCV7 dose for each of seven serotypes tested | |||
Table 1 Footnotes
aVaccine efficacy for a 3-dose primary series of PCV9 administered at 6, 10, and 14 weeks of age
bVaccine efficacy for 2 doses of PCV7 administered 4 weeks apart estimated using hazard ratios
cIncidence of PCV13 type IPD among children aged 6-18 years with HIV/AIDS in the US, Active Bacterial Core surveillance (ABCs), CDC unpublished 2007-09, ABCs incidence data was only used to compute the number needed to vaccinate and not used in the evidence profile
dIncidence in vaccinated, absolute risk, and number needed to vaccinate was estimated using VE estimate from two RCTs[2],[3] and applying it to baseline incidence of PCV13 type IPD in the US population with HIV/AIDS
eSummary vaccine efficacy estimated using data from two RCTs[2],[3]
fVaccine effectiveness for ≥1 doses of PCV7 adjusted for herd effects
Abbreviations:
GMC= Geometric Mean Concentration
GMT= Geometric Mean Titers
IgG= Immunoglobulin G
OR= Odds Ratio
GMFR=Geometric Mean Fold Rise
N/A= Not applicable
RCT= Randomized Controlled Trial
Table 2. Harms: 13-valent Pneumococcal Conjugate Vaccine in immunocompromised children
| Outcome | Study design | Incidence in controls | Incidence in vaccinated | Comments |
|---|---|---|---|---|
| Serious adverse events (SAE) | ||||
| Overall SAE | 1 Pre/Post,[5] 3 RCTs[10-12] | N/A | 0 | No serious adverse events reported |
| Deaths | 1 Pre/Post,[5] 3 RCTs[10-12] | N/A | 0 | No deaths |
| Systemic Adverse Events | ||||
| Study design | Proportion reporting | |||
| Fatigue | Pre/post study, 2 doses, children with SCD[5] | 66.1% | ||
| Headache | Pre/post study, 2 doses, children with SCD[5] | 53.6% | ||
| New generalized muscle pain | Pre/post study, 2 doses, children with SCD[5] | 74.8% | ||
| Vomiting | Pre/post study, 2 doses, children with SCD[5] | 15.4% | ||
| Diarrhea | Pre/post study, 2 doses, children with SCD[5] | 15.4% | ||
| New generalized joint pain | Pre/post study, 2 doses, children with SCD[5] | 39.8% | ||
| Study design | Incidence in controls | Incidence in vaccinated | Comments | |
| Mild, self-limited secondary reactions | 1 RCT[12] | 20% | 34% | P=0.07 |
| 2 RCTs[10],[11] | N/A | N/A | No serious adverse events; no differences in systemic adverse events reported | |
Table 2 Footnotes
RCT= Randomized Controlled Trial
Table 3. Evidence Type for Benefits and Harms: 13-valent Pneumococcal Conjugate Vaccine in immunocompromised older children
| Outcome | Study design (# studies) | Risk of bias | Inconsistency | Indirectness | Imprecision | Evidence typea |
|---|---|---|---|---|---|---|
| Benefits | ||||||
| Invasive Pneumococcal Disease | RCT (2) | No serious | No serious | Very seriousb | No serious | 3 |
| Observational (1) | No serious | N/A | No serious | No serious | 3 | |
| Pneumonia | RCT (1) | No serious | N/A | Very seriousb | No serious | 3 |
| Death | RCT (1) | No serious | N/A | Very seriousb | No serious | 3 |
| Antibody response to vaccine types | Pre/post (2) | No serious | No serious | No serious | No serious | 3 |
| RCT (4) adults, RCT (2) children | No serious | No serious | Very seriousc | No serious | 3 | |
| Harms | ||||||
| Systemic adverse events | Pre/post (1) | No serious | N/A | No serious | No serious | 3 |
| RCT (5) | No serious | No serious | Very seriousc | No serious | 3 | |
Table 3 Footnotes
N/A= Not applicable
a Evidence type:
1= Randomized controlled trials (RCTs), or overwhelming evidence from observational studies.
2= RCTs with important limitations, or exceptionally strong evidence from observational studies.
3= Observational studies, or RCTs with notable limitations.
4= Clinical experience and observations, observational studies with important limitations, or RCTs with several major limitations.
b Indirectness due to 1) different intervention (PCV9, 3 doses; PCV7, 2 doses) and 2) different population (South Africa, infants; Malawi, adults)
c Indirectness due to 1) different intervention (PCV7 or PCV9) and 2) different population (adults)
Table 4. Summary of Evidence: 13-valent Pneumococcal Conjugate Vaccine in immunocompromised children
| Comparison | Outcome | Study design (# studies) | Findings | Evidence type | Overall evidence type |
|---|---|---|---|---|---|
| PCV9 or PCV7 vs. No vaccination | Invasive Pneumococcal Disease | RCT (2) | Decreased risk among vaccinated | 3 | 3 |
| PCV9 vs. No vaccination | Pneumonia | RCT (1) | Decreased risk among vaccinated | 3 | 3 |
| PCV9 vs. No vaccination | Death | RCT (1) | No change in outcome | 3 | 3 |
| PCV13, PCV7, or PCV9 vs PPSV or placebo | Antibody response to vaccine types | Pre/post (2) RCT (6) | Increases in antibody titers post-vaccination | 3 | 3 |
| PCV13 vs. PCV7 | SAEb | Pre/Post (1) RCT (5) | No serious adverse events | 3 | 3 |
Table 4 Footnotes
b SAE= Serious Adverse Events
Table 5. Considerations for Formulating Recommendations: 13-valent Pneumococcal Conjugate Vaccine in immunocompromised children
| Key factors | Comments |
|---|---|
| Evidence type for benefits and harms | Indirectness & lack of evidence for 3 of 4 critical disease outcomes |
| Balance between benefits and harms | Benefits outweigh harms Very high burden of disease in immunocompromised children |
| Value | ACIP pneumococcal work group consensus regarding the importance of preventing critical pneumococcal outcomes |
| Cost-effectiveness | Uncertainty regarding costs/benefits relative to PPSV23 |
Summary: Benefits are greater than potential harms. High values were placed on prevention of the morbidity and mortality of pneumococcal infection among immunocompromised children. (recommendation category A; evidence type 3)
The ACIP Pneumococcal Work Group concluded that broader serotype protection can be achieved through use of both PCV13 and PPSV23 among immunocompomised children 6 through 18 years old; 49% of IPD in this group is caused by PCV13 serotypes, and an additional 23% by serotypes in PPSV23 not included in PCV13. Evidence from immunogenicity studies demonstrate that antibody response is non-inferior or superior when PCV is given before PPSV23 compared to PPSV23 administration before PCV.[11,12,14] Although the optimal interval for PCV13 followed by PPSV23 has not been specifically studied, significant increases in antibody as well as non-inferior to superior response compared to PPSV23 alone has been observed when PPSV23 was given eight weeks after PCV7.[14] For children previously immunized with PPSV23, waiting at least 8 weeks after PPSV23 before giving a dose of PCV13 may provide a better immune response (expert opinion).
The Work Group concluded that Category A (desirable consequences clearly outweigh undesirable consequences) recommendation for the use of PCV13 (evidence type 3) among PCV13-naïve immunocompromised children is warranted because 1) there remains an extremely high burden of pneumococcal disease among immuocompromised children, and 2) indirect effects of PCV13 use in young children are unlikely to eliminate disease caused by PCV13 serotypes in older children with immunocompromising conditions.
References
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- Adamkiewicz TV, Silk BJ, Howgate J, et al. Effectiveness of the 7-valent pneumococcal conjugate vaccine in children with sickle cell disease in the first decade of life. Pediatrics. Mar 2008;121(3):562-569.
- Montalembert M, Abboud MR, Fiquet A, et al. A 2-dose schedule of 13-valent pneumococcal conjugate vaccine (PCV13) given to children with sickle cell disease previously immunized with 23-valent pneumococcal polysaccharide vaccine (PPSV23): results of a phase 3 study. 54th Annual Meeting of the American Society of Hematology, Atlanta, GA, USA. December 8-11, 2012.
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- Feikin DR, Elie CM, Goetz MB, et al. Randomized trial of the quantitative and functional antibody responses to a 7-valent pneumococcal conjugate vaccine and/or 23-valent polysaccharide vaccine among HIV-infected adults. Vaccine. Nov 12 2002;20(3-4):545-553.
- Lesprit P, Pedrono G, Molina JM, et al. Immunological efficacy of a prime-boost pneumococcal vaccination in HIV-infected adults. Aids. Nov 30 2007;21(18):2425-2434.
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- Page last reviewed: April 15, 2016
- Page last updated: June 26, 2013
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