Blastemal predominant type Wilms tumor in Japan: Japan Children's Cancer Group

Tsugumichi Koshinaga, Tetsuya Takimoto, Hajime Okita, Yukichi Tanaka, Eisuke Inoue, Takaharu Oue, Miwako Nozaki, Kunihiko Tsuchiya, Masayuki Haruta, Yasuhiko Kaneko, Masahiro Fukuzawa

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Abstract

Background: Persistence of blastemal components after chemotherapy is a marker of poor outcome in Wilms tumor (WT). Recent reports from local Japanese areas have described pre-chemotherapy blastemal predominant type WT to also be a risk factor for relapse. The significance, however, of blastemal predominant WT remains to be evaluated in a larger study. This study retrospectively evaluated the prognostic significance of pre-chemotherapy blastemal predominant type WT in the Japan Wilms tumor Study (JWiTS) trials. Methods: The JWiTS trial (1996–2013) was a prospective, single-arm study. The outcomes of blastemal predominant type WT were retrospectively evaluated compared with non-blastemal type WT excluding anaplasia between 1996 and 2013. Relapse-free survival (RFS) and overall survival (OS) were estimated. Results: Of 319 primary renal tumors diagnosed by the central pathology review system, advanced stage of pre-chemotherapy blastemal predominant type WT (n = 53; 16.1%) occurred more frequently in older children than non-blastemal type WT (n = 225), and was especially frequent in female patients registered in the JWiTS trials. No significant difference in 10 years RFS and OS (78.8% vs 84.5; P = 0.201) or in 10 years RFS and OS (89.3% vs 93.5; P = 0.45) was seen between pre-chemotherapy blastemal predominant type and non-blastemal type WT. Conclusions: Relapse-free survival and OS are not significantly different between pre-chemotherapy blastemal predominant type and non-blastemal type WT.

Original languageEnglish
Pages (from-to)351-357
Number of pages7
JournalPediatrics International
Volume61
Issue number4
DOIs
Publication statusPublished - 2019 Apr

Keywords

  • Wilms tumor
  • blastemal component
  • blastemal predominant type
  • pediatric
  • renal tumor

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

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    Koshinaga, T., Takimoto, T., Okita, H., Tanaka, Y., Inoue, E., Oue, T., Nozaki, M., Tsuchiya, K., Haruta, M., Kaneko, Y., & Fukuzawa, M. (2019). Blastemal predominant type Wilms tumor in Japan: Japan Children's Cancer Group. Pediatrics International, 61(4), 351-357. https://doi.org/10.1111/ped.13811