# Fever in Children with Cancer: Pathophysiological Insights Using Blood Transcriptomics

## TL;DR

Blood transcriptomics reveals gene expression patterns in febrile children with cancer, helping distinguish bacterial from non-bacterial causes of fever.

## Contribution

The study provides novel transcriptomic insights into febrile episodes in children with cancer, aiding in early discontinuation of unnecessary antibiotics.

## Key findings

- Children with bacteremia showed gene expression related to immunoregulation and vascular function.
- Non-bacteremic fevers showed gene patterns suggesting viral or inflammatory causes.
- Some gene signatures overlapped with known diagnostic signatures in immunocompetent children.

## Abstract

Fever is a frequent complication in children receiving chemotherapy, primarily caused by bloodstream infections and non-infectious inflammation. Yet, the pathophysiological mechanisms remain unclear, and diagnostics are insufficient, which often results in continued antibiotic treatment despite negative blood cultures. In a nationwide study, we collected whole blood in PAXgene tubes from 168 febrile episodes in children with hematological malignancies, including 37 episodes with bacteremia, and performed single-cell RNA sequencing. We compared transcriptomic profiles between febrile children with and without bacteremia. In children with bacteremia, differentially expressed genes were related to immunoregulation and cardiac and vascular function. Children without bacteremia had distinct gene expression patterns, suggesting a viral or other inflammatory cause of fever. Several differentially expressed genes overlapped with previously published transcriptomics-based diagnostic signatures developed in immunocompetent children. In conclusion, blood transcriptomics provided novel insights into the pathophysiological mechanisms of febrile children with hematological malignancies. We found differentially expressed genes suggesting viral infections or non-bacterial inflammation as causes of fever in children with negative blood cultures, supporting early antibiotic discontinuation in children with cancer.