Elevated cerebrospinal fluid leukocyte count and protein concentration at diagnosis: independent risk factors in...

Area of Science:

• Pediatric Oncology
• Neurology
• Hematology

Background:

• Acute lymphoblastic leukemia (ALL) is the most common childhood cancer.
• Central nervous system (CNS) involvement in ALL significantly impacts patient outcomes.
• Accurate prognostic markers are essential for risk stratification and treatment optimization.

Purpose of the Study:

• To evaluate the prognostic value of initial cerebrospinal fluid (CSF) protein concentration and leukocyte count in pediatric ALL patients.
• To determine if these CSF parameters correlate with CNS status and long-term survival.
• To assess the association between CSF abnormalities and the risk of relapse or death.

Main Methods:

• Analysis of a population-based series of 160 children diagnosed with ALL.
• Measurement of initial CSF protein concentration and leukocyte count.
• Categorization of patients into groups based on CSF findings (normal, elevated protein/leukocytes without blasts, presence of blasts).
• Kaplan-Meier survival analysis and multivariate analysis to assess event-free survival and relative risks.

Main Results:

• Elevated CSF protein and/or leukocyte counts were significantly associated with a diminished probability of event-free survival.
• Patients with CSF abnormalities but no malignant lymphoblasts had a 5-year event-free survival of 15%, compared to 65% for those with normal CSF.
• Patients with malignant lymphoblasts in CSF had a 2-year event-free survival of 17%, with significantly higher relative risks of death or relapse.

Conclusions:

• Initial CSF protein concentration and leukocyte count are valuable indicators of CNS status and prognosis in pediatric ALL.
• These markers, even in the absence of blasts, identify a high-risk subgroup requiring closer monitoring.
• Consideration should be given to incorporating elevated CSF protein or leukocyte counts into risk group criteria for future clinical trials.