Classic chromophobe renal cell carcinoma incur a larger number of chromosomal losses than seen in the eosinophilic subtype

Riuko Ohashi, Peter Schraml, Silvia Angori, Aashil A. Batavia, Niels J. Rupp, Chisato Ohe, Yoshiro Otsuki, Takashi Kawasaki, Hiroshi Kobayashi, Kazuhiro Kobayashi, Tatsuhiko Miyazaki, Hiroyuki Shibuya, Hiroyuki Usuda, Hajime Umezu, Fumiyoshi Fujishima, Bungo Furusato, Mitsumasa Osakabe, Tamotsu Sugai, Naoto Kuroda, Toyonori TsuzukiYoji Nagashima, Yoichi Ajioka, Holger Moch

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Chromophobe renal cell carcinoma (chRCC) is a renal tumor subtype with a good prognosis, characterized by multiple chromosomal copy number variations (CNV). The World Health Organization (WHO) chRCC classification guidelines define a classic and an eosinophilic variant. Large cells with reticular cytoplasm and prominent cell membranes (pale cells) are characteristic for classic chRCC. Classic and eosinophilic variants were defined in 42 Swiss chRCCs, 119 Japanese chRCCs and in whole-slide digital images of 66 chRCCs from the Cancer Genome Atlas (TCGA) kidney chromophobe (KICH) dataset. 32 of 42 (76.2%) Swiss chRCCs, 90 of 119 (75.6%) Japanese chRCCs and 53 of 66 (80.3%) TCGA-KICH were classic chRCCs. There was no survival difference between eosinophilic and classic chRCC in all three cohorts. To identify a genotype/phenotype correlation, we performed a genome-wide CNV analysis using Affymetrix OncoScan® CNV Assay (Affymetrix/Thermo Fisher Scientific, Waltham, MA, USA) in 33 Swiss chRCCs. TCGA-KICH subtypes were compared with TCGA CNV data. In the combined Swiss and TCGA-KICH cohorts, losses of chromosome 1, 2, 6, 10, 13, and 17 were significantly more frequent in classic chRCC (p < 0.05, each), suggesting that classic chRCC are characterized by higher chromosomal instability. This molecular difference justifies the definition of two chRCC variants. Absence of pale cells could be used as main histological criterion to define the eosinophilic variant of chRCC.

Original languageEnglish
Article number1492
JournalCancers
Volume11
Issue number10
DOIs
Publication statusPublished - 2019 Oct

Keywords

  • Chromophobe renal cell carcinoma
  • Chromosomal loss
  • Copy number analysis
  • Eosinophilic variant
  • Pale cell
  • Renal cell carcinoma

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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