Associations of Patient Age, Tumor Nephrectomy Weight, and Tumor Diameter with Event-Free and Overall Survival in Stage I or II Favorable Histology Wilms Tumor: A Pooled Analysis of Children's Oncology Group Studies AREN0532 and AREN03B2. Ann Surg 2025 Apr 11
Date
04/11/2025Pubmed ID
40211953Pubmed Central ID
PMC12353671DOI
10.1097/SLA.0000000000006726Scopus ID
2-s2.0-105002399355 (requires institutional sign-in at Scopus site) 2 CitationsAbstract
OBJECTIVE: To evaluate age, TNW, or tumor diameter (TD) as continuous prognostic variables for outcomes in early stage FHWT after accounting for biology and treatment.
SUMMARY OF BACKGROUND DATA: Patient age (< 2 vs. ≥ 2 years) and tumor nephrectomy weight (TNW; < 550g vs. ≥ 550 grams) have been used to risk stratify children with stage I favorable histology Wilms tumor (FHWT) on Children's Oncology Group (COG) studies and select patients for omission of chemotherapy.
METHODS: Included patients had stage I or II FHWT per central review and were treated with nephrectomy only, EE4A, or DD4A on COG trials. Restricted cubic splines models were used to estimate the stage-specific effects of age, TNW, and TD on event-free survival (EFS) and overall survival (OS), accounting for treatment and biology.
RESULTS: In pooled analyses of 775 stage I and 936 stage II patients, age was not significantly associated with EFS or OS for stage I or II patients after accounting for adverse biology that is more prevalent with older age. Greater TNW and larger TD were associated with increased risk of relapse in stage I and increased risk of death in stage II, but not when restricted to patients less than 4 years old.
CONCLUSIONS: Age, TNW, and TD are each prognostic for EFS or OS in some cohorts of patients with stage I or II FHWT. However, after accounting for adverse biology that becomes more prevalent at older ages, these factors are no longer independently prognostic. The next COG FHWT study will implement and validate these findings.
