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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2000 Feb;91(2):181–189. doi: 10.1111/j.1349-7006.2000.tb00930.x

p53 Status in Multiple Human Urothelial Cancers: Assessment for Clonality by the Yeast p53 Functional Assay in Combination with p53 Immunohistochemistry

Shinji Yamamoto 1, Mitsuhiro Tada 3, Chyi Chia R Lee 1, Chikayoshi Masuda 1, Hideki Wanibuchi 1, Rikio Yoshimura 2, Seiji Wada 2, Keisuke Yamamoto 2, Taketoshi Kishimoto 2, Shoji Fukushima 1,✉
PMCID: PMC5926329  PMID: 10761705

Abstract

Multifocal synchronous or metachronous tumor development is a common observation in human urothelial cancer cases. However, the underlying mechanism has remained obscure. We have employed a new tool to investigate the p53 gene status, the yeast p53 functional assay, in combination with immunohistochemistry in a total of 50 tumor samples from 32 cases with urothelial cancers, including 8 with multiple synchronous tumor development and 2 demonstrating metachronous tumors. p53 mutations were found in 13 cases (9 with missense mutations, 3 with deletion, 1 with splicing mutation) by the yeast p53 functional assay. p53 protein overexpression was seen in all 9 cases with missense mutations, but in only one of the 4 cases with nonsense mutations. Two tumors without p53 mutation also showed positive p53 immunoreactivity. Overall, p53 abnormalities including mutations and/or protein overexpression were found in 15 (47%) cases. p53 abnormalities were significantly more frequent in non‐papillary and in high grade tumors. Loss of the wild type allele in addition to a p53 mutation was suggested in 8 of the 15 (53%) cases. All 4 cases with mutations in multiple synchronous tumors had identical p53 mutations in the separate urothelial cancers, strongly suggestive of monoclonality. The one case with multiple metachronous tumors, in contrast, was characterized by variation in the p53 status, indicative of different clonal origins. In conclusion, combined assessment for p53 status as used here (yeast p53 functional assay plus immunohistochemistry) may provide insights into the molecular mechanisms of urothelial carcinogenesis.

Keywords: Urothelial cancer, p53, The yeast functional assay, Clonal growth, Loss of heterozygosity

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