Infectious Morbidity During Pediatric Acute Myeloid Leukemia Chemotherapy in a High-Income Country: A 15-Year...

Infection causes significant morbidity and mortality in pediatric acute myeloid leukemia (pAML). This study describes the incidence and risk factors of bloodstream infection (BSI) and invasive fungal infection (IFI) in pAML.

A retrospective chart review was performed of patients treated according to the ANLL-97/AML-12 (N = 116), AML-15 (N = 60), or DB AML-01 (N = 67) protocols between 1998 and 2014. Cumulative incidence was analyzed for infectious outcomes (any BSI, viridans group streptococci [VGS-BSI], Gram-negative rod [GNR-BSI], IFI). Risk factors were analyzed in multivariable models. Recurrent event analyses were performed to evaluate whether previous infection(s) were related to subsequent infection.

The cumulative incidence of any BSI was 78%, VGS-BSI 35%, GNR-BSI 15%, and IFI 11% through Day 150. Incidence of GNR-BSI decreased over time; AML-15 hazard ratio ([HR] 0.37, 95% confidence interval [CI]: 0.14-0.98, p = 0.045) and DB AML-01 (HR 0.42, 95% CI: 0.18-0.97, p = 0.042) compared to ANLL-97/AML-12. White blood cell counts ≥20 × 10⁹/L at diagnosis and older age were associated with lower infection risk. Recurrent event analyses showed a higher risk of subsequent BSI for patients who had two or more prior BSIs.

Despite efforts to improve supportive care in pAML, only GNR-BSI cumulative incidence declined over time. Future studies should continue working toward decreasing the incidence of infection while maintaining treatment efficacy.