Immune Function and Response to Vaccination After Cancer Therapy in Pediatric Patients

Inclusion Criteria: 1. Written informed consent, HIPAA authorization for release of personal health information, and assent, when applicable from the subject, parent, or legal guardian. 2. Age greater than or equal to 2 years and less than 22 years at the time of consent 3. Lansky/Karnofsky Performance Status of greater than 50 (ECOG less than 2) within 60 days prior to date of enrollment/randomization 4. Histological or cytological confirmation of any malignancy treated by the Pediatric Oncology team of Levine Children's Hospital 5. History of any malignant diagnosis treated with at least one cycle of cancer directed systemic therapy 6. Must be no more than 60 days from last dose of cancer directed systemic therapy at time of enrollment/randomization 7. As determined by the enrolling physician, ability of the subject and parent/caregiver to understand and comply with study procedures for the entire length of the study Exclusion Criteria: 1. Malignant disease treated with observation, surgery, or radiotherapy alone 2. Known coexisting immunodeficiency 3. Subjects with normal baseline titers for all investigated vaccines 4. Known pregnancy 5. Documented previous severe allergic reaction to any vaccine or component of a vaccine 6. Documented current/active, severe infection, as determined by the investigator