Genome-wide mutation analysis in precancerous lesions of endometrial carcinoma

Lihong Li, Pinli Yue, Qianqian Song, Ting Tai Yen, Shiho Asaka, Tian Li Wang, Anna L. Beavis, Amanda N. Fader, Yuchen Jiao, Guangwen Yuan, Ie Ming Shih, Yan Song

Research output: Contribution to journalArticlepeer-review

Abstract

Clinicopathological evidence supports endometrial atypical hyperplasia (AH) or endometrial intraepithelial neoplasia as the precursor of uterine endometrioid carcinoma (EC), the most common gynecologic malignancy. However, the pathogenic progression from AH to EC remains unclear. Here, we employed whole-exome sequencing to identify somatic mutations and copy number changes in micro-dissected lesions from 30 pairs of newly diagnosed AH and EC. We found that all but one pair of AHs shared the same DNA mismatch repair status as their corresponding ECs. The percentage of common mutations between AH lesions and corresponding ECs varied significantly, ranging from 0.1% to 82%. Microsatellite stable AHs had fewer cancer driver mutations than ECs (5 versus 7, p = 0.017), but among microsatellite unstable AHs and ECs there was no difference in mutational numbers (36 versus 38, p = 0.65). As compared to AH specimens, 19 (79%) of 24 microsatellite stable EC tumors gained new cancer driver mutations, most of which involved PTEN, ARID1A, PIK3CA, CTNNB1, or CHD4. Our results suggest that some AH lesions are the immediate precursor of ECs, and progression depends on acquisition of additional cancer driver mutations. However, a complex clonal relationship between AH and EC can also be appreciated, as in some cases both lesions diverge very early or arise independently, thus co-developing with distinct genetic trajectories. Our genome-wide profile of mutations in AH and EC shines new light on the molecular landscape of tumor progression.

Original languageEnglish (US)
Pages (from-to)119-128
Number of pages10
JournalJournal of Pathology
Volume253
Issue number1
DOIs
StatePublished - Jan 2021

Keywords

  • PapSEEK
  • atypical hyperplasia
  • endometrioid carcinoma
  • microsatellite instability-high
  • mutation
  • whole-exome sequencing

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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