Abstract
Childhood vaccine-associated immune thrombocytopenia (ITP) has a mostly favorable prognosis. To identify factors associated with prognosis, a retrospective survey was conducted with children with ITP who were registered in the Japanese Society of Pediatric Hematology/Oncology registry from 2008 to 2011. A total of 477 patients were categorized into four groups by event preceding ITP onset: vaccine-precedence (VP; n = 43), vaccine/infection-precedence (VIP; n = 34), infection-precedence (IP; n = 162), and no vaccine/infection-precedence (NVI; n = 238). Compared to IP and NVI, VP and VIP were significantly younger at diagnosis, with the age distribution peaking at infancy, and more frequently had favorable prognosis. Time to platelet recovery to 100 × 103/µL was significantly faster for VP and VIP than NVI. Multivariate Cox regression analysis with sex, age at diagnosis, infection-precedence, and vaccine-precedence as variables revealed age < 36 months (HR 0.992, 95% CI 0.989–0.995; p < 0.001) and male sex (HR 0.770, 95% CI 0.623–0.952; p = 0.015) as associated factors, but not infection-precedence (p = 0.149) or vaccine-precedence (p = 0.650). In subgroup analysis in patients < 36 months, age at diagnosis (p < 0.001) was the only associated factor. Favorable prognosis of childhood vaccine-associated ITP is correlated with young age at vaccination, but not with vaccination itself.
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Acknowledgements
We extend our sincere condolences to family, friends, and colleagues of Dr. Shigeru Ota, who passed away on February 20, 2019, at the age of 69, without seeing the completion of this dissertation. We extend our sincere thanks to Ms. Michiyo Kanda for her efforts in data processing.
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JK conceived the study, analyzed the data, and helped write the manuscript. HN carried out data collection and data cleaning. KM, YT, AI, YS, KF, NM, TO, and EI wrote the manuscript. EI analyzed the platelet recovery data statistically. MI conceived and designed the study, analyzed the data further, and mainly wrote the manuscript. All authors read and approved the final manuscript.
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Kitazawa, J., Nakadate, H., Matsubara, K. et al. Favorable prognosis of vaccine-associated immune thrombocytopenia in children is correlated with young age at vaccination: Retrospective survey of a nationwide disease registry. Int J Hematol 115, 114–122 (2022). https://doi.org/10.1007/s12185-021-03230-7
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DOI: https://doi.org/10.1007/s12185-021-03230-7