Title

Comprehensive renal function evaluation in patients treated for synchronous bilateral Wilms tumor.

Document Type

Journal Article

Publication Date

1-1-2017

Journal

Journal of Pediatric Surgery

Volume

52

Issue

1

Inclusive Pages

98-103

DOI

10.1016/j.jpedsurg.2016.10.027

Keywords

Chemoradiotherapy, Adjuvant; Child; Child, Preschool; Female; Follow-Up Studies; Glomerular Filtration Rate; Humans; Infant; Kidney Neoplasms; Male; Nephrectomy; Retrospective Studies; Treatment Outcome; Wilms Tumor

Abstract

OBJECTIVES: The purpose of this study was to perform a comprehensive assessment of long-term renal function in patients treated at our institution for synchronous bilateral Wilms tumor (BWT) and to determine the optimal method for estimating glomerular filtration rate (eGFR).

METHODS: Surgical approach, adjuvant therapy, and pathology reports were reviewed for patients with at least six months follow-up from definitive surgery. eGFRs, as assessed by the Schwartz and Chronic Kidney Disease in Children (CKiD) formulas, were compared to measured GFR (mGFR) determined by (99m)Tc-DTPA scanning. Urine studies, including microalbumin, β-microglobulin, and FENa were also reviewed.

RESULTS: Forty-two patients were identified. Of 36 living patients, 28 (77.8%) had greater than 6months follow-up, with a median overall follow-up of 5.2years (range: 1.4-13.4). The median mGFR was 97mL/min/1.73m(2), while the median eGFRSchwartz and eGFRCKiD were 103.3mL/min/1.73m(2) and 79.7mL/min/1.73m(2), respectively, (p=0.13 and p=0.75, compared to mGFR). Eleven (39.3%) patients had at least one abnormal urine study (microalbumin >30μg/g creatinine, n=3; β-2 microglobulin >133μg/g creatinine, n=9; FENa>1%, n=4).

CONCLUSIONS: In our series, few patients had an abnormally low GFR. Neither method for estimating GFR gave a significantly different result from measured GFR, suggesting that the Schwartz equation is adequate, although specific urine tests may be more sensitive for detecting subtle renal dysfunction.

LEVEL OF EVIDENCE: Level IV - retrospective case series with no comparison group.

Peer Reviewed

1