A Personalised Vaccination Program Based on Immune Reconstitution in Paediatric Cancer Survivors

Area of Science:

• Immunology
• Paediatric Oncology
• Vaccinology

Background:

• Paediatric cancer survivors often have weakened immune systems post-treatment.
• Current revaccination guidelines may not suit all survivors due to varied immune recovery timelines.

Purpose of the Study:

• To evaluate a personalized approach to revaccination based on individual immune recovery in paediatric cancer survivors.
• To assess the applicability of existing revaccination guidelines across different paediatric malignancies.

Main Methods:

• Immune recovery assessed via antibody titers, immunoglobulin levels, B/T-cell subpopulations, TREC/KREC markers.
• Patients categorized into per-protocol (tested within 3-6 months) and protocol-deviated groups.

Main Results:

• Significant modifications to revaccination guidelines were needed for both groups (PPG: 57.9% major, 36.8% minor; ITT: 40.4% major, 57.7% minor).
• Hematologic malignancy survivors required more major modifications than solid tumor survivors (83.3% vs. 46.2% in PPG; 52.9% vs. 34.3% in ITT).

Conclusions:

• Immune recovery post-paediatric cancer therapy is highly variable, especially in hematologic malignancies.
• Personalized revaccination strategies using comprehensive immunological assessments are crucial for optimal protection.