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Clinicopathological and molecular correlations in traditional serrated adenoma

Abstract

Background

Traditional serrated adenoma (TSA) is the least common type of colorectal serrated polyp, which exhibits considerable morphological and molecular diversity.

Methods

We examined the spectra of alterations in MAPK and WNT pathway genes and their relationship with clinicopathological features in 128 TSAs.

Results

Sequencing analyses identified BRAF V600E, BRAF non-V600E, KRAS, and NRAS mutations in 77, 3, 45, and 1 lesion, respectively. Collectively, 124 lesions (97%) had mutations in MAPK pathway genes. Alterations in WNT pathway genes were identified in 107 lesions (84%), including RSPO fusions/overexpression, RNF43 mutations, ZNRF3 mutations, APC mutations, and CTNNB1 mutations in 47, 45, 2, 13, and 2 lesions, respectively. Ten lesions (8%) harbored GNAS mutations. There was significant interdependence between the altered MAPK and WNT pathway genes. RSPO fusions/overexpression was significantly associated with KRAS mutations (31/47, 66%), whereas most RNF43 mutations coexisted with the BRAF V600E mutation (40/45, 89%). Histologically, extensive slit-like serration was more common in lesions with the BRAF V600E mutation (71%) and those with RNF43 mutations (87%). Prominent ectopic crypt formation was more prevalent in lesions with RSPO fusions/overexpression (58%) and those with GNAS mutations (100%).

Conclusions

Our observations indicate that TSAs mostly harbor various combinations of concurrent WNT and MAPK gene alterations. The associations between genetic and morphological features suggest that the histological diversity of TSA reflects the underlying molecular heterogeneity.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant numbers 17K08711 and 18K07925. We thank Ms. Sachiko Miura, Ms. Toshiko Sakaguchi, Ms. Chizu Kina, and Yuka Nakamura for their skillful technical assistance.

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Correspondence to Shigeki Sekine.

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Sekine, S., Yamashita, S., Yamada, M. et al. Clinicopathological and molecular correlations in traditional serrated adenoma. J Gastroenterol (2020). https://doi.org/10.1007/s00535-020-01673-z

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Keywords

  • Traditional serrated adenoma
  • WNT pathway
  • MAPK pathway