Renal cell carcinoma in children and young adults: clinicopathological, immunohistochemical, and VHL gene analysis of 46 cases with follow-up.

Abstract:

:To further study the characteristics of renal cell carcinoma (RCC) in young patients and better define their biological features, 46 RCCs of patients younger than 25 years were morphologically and immunohistochemically characterized with follow-up. Loss of heterozygosity (LOH) analysis of the von Hippel-Lindau (VHL) gene region and screening for VHL gene mutations were performed in all tumors. Applying the 2004 WHO classification for RCC, there were 19 Xp11.2 translocation RCCs, 9 clear cell RCCs, 17 papillary RCCs, and 1 unclassified RCC. All 19 Xp11.2 translocation RCCs showed moderate to strong immunoreactivity for TFE3. None had TFEB immunoreactivity. One Xp11.2 translocation RCC had an unreported morphology with empty or ground glass nuclei, occasional nuclear grooves, inconspicuous nucleoli and abundant mucinous material in stroma.VHL gene analysis revealed deletions at 3p25-26 in 1 clear cell RCC and 1 papillary type 2 RCC. The papillary type 2 RCC was also presented with a family history of VHL disease and found a germline mutation G → C on a splicing site at position 553+5. The present case widens the spectrum of microscopic features to be found in VHL-associated RCC. There were no VHL mutations in the remaining 45 RCCs. Statistical analysis of stage and outcome revealed that TFE+ pediatric RCCs were significantly more frequently associated with a higher pTNM pT3/pT4 stage and a poorer outcome than TFE-RCCs (P < .05). Owing to the already known aggressive behavior of these Xp11.2 translocation RCCs, patients with TFE+ pediatric RCCs should benefit from a stricter follow-up.

journal_name

Int J Surg Pathol

authors

Rao Q,Chen JY,Wang JD,Ma HH,Zhou HB,Lu ZF,Zhou XJ

doi

10.1177/1066896909354337

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

170-9

issue

2

eissn

1066-8969

issn

1940-2465

pii

1066896909354337

journal_volume

19

pub_type

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