Assessment of the immune response to trivalent split influenza vaccine in children with solid tumors.
OBJECTIVE
To assess the immune response to influenza vaccine in children with solid tumors receiving chemotherapy or under the influence of chemotherapy.


METHODS
Forty-five children (aged 1-18) with solid tumors on chemotherapy or within 6 months of completion of chemotherapy were included in the study. The children received two doses of intramuscular trivalent split influenza vaccine with 1 month apart in November-December 2003 (children <4 age 0.25 ml; >4 age 0.5 ml). Antibody titer was detected in the pre-vaccination and 4-week post-vaccination sera by hemagglutination inhibition (HI) method. Immune responses were measured as protective, geometric mean titers (GMT), and fourfold rises in HI titers.


RESULTS
We revealed that the post-vaccination GMT for each of the three antigens in patients with solid tumors has increased significantly (P < 0.05). A fourfold rise in the percentage of post-vaccination antibody titers has been detected as 84.4% for H(1)N(1), 77.8% for H(3)N(2), 60% for B. Stratification of patients as on active chemotherapy or being within 6 months of completion of chemotherapy in terms of fourfold rise in antibody titers exposed a statistically significant difference for only B (P = 0.34). Post-vaccination protective rates were between 86 and 97%.


CONCLUSIONS
Due to the interruptions in treatment caused by influenza infections, and economic benefits of the vaccine, we suggest that inactivated influenza vaccine should be applied as two doses annually in patients with solid tumor.
Bektas
Omer
O
Department of Pediatric Oncology, Gazi University Faculty of Medicine, Besevler, Ankara, Turkey.
Karadeniz
Ceyda
C
Oguz
Aynur
A
Berberoglu
Semha
S
Yilmaz
Neziha
N
Citak
Caglar
C
D000293:Adolescent; D000914:Antibodies, Viral / Q000097:blood; D002648:Child; D002675:Child, Preschool; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000276:immunology*; D007273:Injections, Intramuscular; D008297:Male; D009369:Neoplasms / Q000276:immunology*; D016896:Treatment Outcome; D014611:Vaccination
D000914:Antibodies, Viral; D007252:Influenza Vaccines