Pathogenesis of multiple pancreatic cancers involves multicentric carcinogenesis and intrapancreatic metastasis

Yusuke Fujita, Sachiko Matsuda, Yasushi Sasaki, Yohei Masugi, Minoru Kitago, Hiroshi Yagi, Yuta Abe, Masahiro Shinoda, Takashi Tokino, Michiie Sakamoto, Yuko Kitagawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

There are increased opportunities in oncology clinics to identify multiple pancreatic ductal adenocarcinomas (PDAC) that co-occur simultaneously or arise metachronously in the pancreatic parenchyma, yet their pathogenesis remains elusive. We hypothesized that two potential pathways, multicentric carcinogenesis and intrapancreatic metastasis, might contribute to forming multiple PDAC. Among 241 resected cases, we identified 20 cancer nodules from nine patients with multiple PDAC (six with synchronous PDAC, one with metachronous PDAC, and two with both synchronous and metachronous PDAC). Integrated clinical, pathological, and mutational analyses, using TP53 and SMAD4 immunostaining and targeted next-generation sequencing of 50 cancer-related genes, were conducted to examine the intertumor relationships. Four of the nine patients were assessed as having undergone multicentric carcinogenesis because of heterogeneity of immunohistochemical and/or mutation characteristics. In contrast, tumors in the other five patients showed intertumor molecular relatedness. Two of these five patients, available for matched sequencing data, showed two or more shared mutations. Moreover, all the smaller nodules in these five patients showed identical TP53 and SMAD4 expression patterns to the corresponding main tumors. Consequently, these five patients were considered to have undergone intrapancreatic metastasis. None of the five smaller nodules arising from intrapancreatic metastasis was accompanied by pancreatic intraepithelial neoplasia, and three of them were tiny (≤1mm). Patients whose tumors resulted from intrapancreatic metastasis appeared to have higher disease stages and worse outcome than those with tumors from multicentric carcinogenesis. Our results provide insight into pancreatic carcinogenesis, showing that the development of multiple PDAC involves distinct evolutionary paths that potentially affect patient prognosis.

Original languageEnglish
Pages (from-to)739-748
Number of pages10
JournalCancer science
Volume111
Issue number2
DOIs
Publication statusPublished - 2020 Feb 1

Keywords

  • multicentric occurrence
  • multiple pancreatic cancers
  • next-generation sequence
  • pancreatic carcinogenesis
  • pancreatic intraepithelial neoplasia

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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