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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1993 May;84(5):526–531. doi: 10.1111/j.1349-7006.1993.tb00171.x

Genetic Alterations in Thyroid Tumor Progression: Association with p53 Gene Mutations

Takashi Ito 1, Toshio Seyama 1, Terumi Mizuno 1, Naohiro Tsuyama 1, Yuzo Hayashi 2, Kiyohiko Dohi 3, Nori Nakamura 1, Mitoshi Akiyama 1,✉
PMCID: PMC5919182  PMID: 8100564

Abstract

To identify the genetic events that must be involved in thyroid tumor progression, we initially investigated p53 gene alterations in 10 papillary adenocarcinomas, 4 follicular adenocarcinomas, and 8 undifferentiated carcinomas. Base substitutional mutations in exons 5 to 8 and loss of heterozygosity (LOH) of the p53 gene were not detected in papillary or follicular adenocarcinomas. However, 7 of 8 undifferentiated carcinomas were carrying base substitutional mutations, and LOH was detected in 3 of 5 informative cases. Furthermore, to verify that the p53 gene alterations are truly involved in tumor progression, DNA from individual foci of the four undifferentiated carcinomas coexisting with a differentiated focus and from one follicular adenocarcinoma with an undifferentiated focus was analyzed by direct sequencing and polymerase‐chain‐reaction‐restriction‐fragment‐length polymorphism (PCR‐RFLP). Base substitutional mutations in the p53 gene from exons 5 to 8 were identified exclusively in the undifferentiated foci, but not in the differentiated foci. LOH was observed in 3 of 4 informative undifferentiated foci. In one of these positive cases, LOH was observed in both papillary adenocarcinoma and undifferentiated carcinoma. However, a p53 gene mutation at codon 248 was detected in the undifferentiated carcinoma but not in the papillary adenocarcinoma. The results imply that LOH occurs first in papillary adenocarcinoma followed by a p53 mutation during the transition from papillary adenocarcinoma to undifferentiated carcinoma. Maintenance of LOH during tumor progression excludes the possibility that these different histological foci are derived from different origins and represents molecular evidence that undifferentiated carcinoma is very likely derived from preexisting papillary adenocarcinoma. Furthermore, these results strongly suggest that the mutated p53 gene plays a crucial role in de‐differentiation during the progression of thyroid tumors.

Keywords: Tumor progression, p53, Thyroid carcinoma, De‐differentiation, Multistep carciogenesis

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