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• W1980233990 abstract "In this study we tested the prevalence, histoanatomical distribution and tumour biological significance of the Wnt target protein and cancer stem cell marker LGR5 in tumours of the human gastrointestinal tract. Differential expression of LGR5 was studied on transcriptional (real-time polymerase chain reaction) and translational level (immunohistochemistry) in malignant and corresponding non-malignant tissues of 127 patients comprising six different primary tumour sites, i.e. oesophagus, stomach, liver, pancreas, colon and rectum. The clinico-pathological significance of LGR5 expression was studied in 100 patients with gastric carcinoma (GC). Non-neoplastic tissue usually harboured only very few scattered LGR5(+) cells. The corresponding carcinomas of the oesophagus, stomach, liver, pancreas, colon and rectum showed significantly more LGR5(+) cells as well as significantly higher levels of LGR5-mRNA compared with the corresponding non-neoplastic tissue. Double staining experiments revealed a coexpression of LGR5 with the putative stem cell markers CD44, Musashi-1 and ADAM17. Next we tested the hypothesis that the sequential changes of gastric carcinogenesis, i.e. chronic atrophic gastritis, intestinal metaplasia and invasive carcinoma, are associated with a reallocation of the LGR5(+) cells. Interestingly, the spatial distribution of LGR5 changed: in non-neoplastic stomach mucosa, LGR5(+) cells were found predominantly in the mucous neck region; in intestinal metaplasia LGR5(+) cells were localized at the crypt base, and in GC LGR5(+) cells were present at the luminal surface, the tumour centre and the invasion front. The expression of LGR5 in the tumour centre and invasion front of GC correlated significantly with the local tumour growth (T-category) and the nodal spread (N-category). Furthermore, patients with LGR5(+) GCs had a shorter median survival (28.0±8.6 months) than patients with LGR5(-) GCs (54.5±6.3 months). Our results show that LGR5 is differentially expressed in gastrointestinal cancers and that the spatial histoanatomical distribution of LGR5(+) cells has to be considered when their tumour biological significance is sought." @default.
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• W1980233990 date "2012-04-18" @default.
• W1980233990 modified "2023-09-27" @default.
• W1980233990 title "The Spatial Distribution of LGR5+ Cells Correlates With Gastric Cancer Progression" @default.
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• W1980233990 doi "https://doi.org/10.1371/journal.pone.0035486" @default.
• W1980233990 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3329462" @default.
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